1. Which gas is present under pressure in soft drinks?

A. Oxygen B. Carbon monoxide C. Carbon-di-oxide D. Nitrous oxide

Answer: Option C
Explanation:
The amount of calories varies in soft drinks, depending on the sweetener used. Soft drinks get their fizz from the carbon dioxide added under pressure.
2. The anode in a dry cell consists of .......................

A. Zinc B. Lead C. Iron D. Aluminium

Answer: Option A
Explanation:
A Dry cell is a type of chemical cell, commonly used today, in the form of batteries, for many electrical appliances. It was developed in 1886 by the German scientist Karl Gassner. A standard dry cell comprises a zinc anode.
3. Which is required for solar energy conversion ?

A. Nitrogen B. Oxygen C. Carbon D. Silicon

Answer: Option D
Explanation:
Silicon is what is known as a semiconductor, meaning that it shares some of the properties of metals and some of those of an electrical insulator, making it a key ingredient in solar cells. Let’s take a closer look at what happens when the sun shines onto a solar cell.
4. The maximum amount of ..................... is present in LPG

A. Methane B. Butane C. Ethane D. Methylene

Answer: Option B
Explanation:
LPG (LIQUIFIED PETROLEUM GAS) is a predominant mixture of propane and Butane with a small percentage of unsaturated (Propylene and Butylene) and some lighter [latex]{C}_{2}[/latex] as well as heavier [latex]{C}_{5}[/latex] fractions.
5. A supercooled liquid is ..................

A. Water B. Acids C. Glass D. Oil

Answer: Option C
Explanation:
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid.
Ex – glass
6. What is the mass of one mole of electron ?

A. 0.55mg B. 0.05mg C. 5.5mg D. 50mgmg

Answer: Option A
Explanation:
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid.
The mass of one mole of electron = 9.1 x 10~28x 6.022 x 1023 = 0.55 mg
7. Which is the longest period in the modern periodic table?

A. 2nd period B. 1st period C. 6th period D. 4th period

Answer: Option C
Explanation:
1st period is the Shortest period 6th period is the longest period.
8. Newspaper can be recycled again and again how many times?

A. 6 times B. 2 times C. 3 times D. 5 times

Answer: Option D
Explanation:
Printer and copy paper can be recycled 57 times before the fibers become too short and need to be combined with other paper or used for other purposes. Newspaper on the other the hand is already made of low quality and can be made into new newspaper or egg cartons.
9. What is the smallest form of matter?

A. Solid B. Gas C. Liquid D. Plasma

Answer: Option B
Explanation:
Three states of matter are solid, liquid and gas.The smallest a form of matter Gas
10. Salt bridges used to .....................

A. transfer Ions B. oxidation C. reduction D. decarboxylation

Answer: Option A
Explanation:
The purpose of a salt bridge is to transfer ions by connecting the two half-cells.
11. The Lewis acids are ...................

A. Electron repeller B. Electron Affinity C. Electron Adsorbant D. Electron Deficient

Answer: Option D
Explanation:
Electron-deficient molecules (those with less than an octet of electrons) are Lewis acids
12. The number of fundamental particles in an atom of the lightest isotope carbon are

A. 8 B. 12 C. 18 D. 20

Answer: Option C
Explanation:
The number of fundamental particles in an atom of the lightest isotope carbon is 18.
13. The Octet rule does not always hold for which of the following elements?

A. S B. P C. F D. D

Answer: Option B
Explanation:
The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When discussing the octet rule, we do not consider d or f electrons. Only the s and p electrons are involved in the octet rule. But the Octet the rule does not always hold for P
14. Shielding effect across the period is ........................

A. Constant B. Increasing C. Decreasing D. Decreasing and Increasing

Answer: Option A
Explanation:
Shielding effect across the period is constant.
15. The number of isotopes of elements with even mass the number and even atomic number are

A. 154 B. 123 C. 145 D. 134

Answer: Option A
Explanation:
The number of isotopes of elements with even mass number and even atomic number is 154.
16. Unit rate of reaction is ......................

A. Moles dm -1 sec -1 B. Moles dm -1 sec -2 C. Moles dm -3 sec -2 D. Moles dm -3 sec -1

Answer: Option D
Explanation:
Unit rate of reaction is Moles dm -3 sec -1
17. Geometric Isomerism found in .................

A. Alkynes B. Alkenes C. Alkanes D. All of these

Answer: Option B
Explanation:
Cis/trans isomerism(geometric isomerism) is a term used in organic chemistry to refer to the stereoisomerism engendered in the relative orientation of functional groups within a molecule
18. Litmus is obtained from .......................

A. protozoa B. Fungus C. archaea D. Lichens

Answer: Option D
Explanation:
Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator used to test materials for acidity.
19. Rock salt is a mineral containing which of the following ?

A. Cadmium B. Nitrogen Oxide C. Sodium chloride D. Chlorine

Answer: Option C
Explanation:
Rock salt is a mineral form and is isometric crystals of Sodium Chloride. It may also contain other elements like magnesium, potassium, etc
20. Which of the following is Dry ice?

A. Solid carbon dioxide B. Solid carbon monoxide C. Liquid carbon dioxide D. Liquid carbon monoxide

Answer: Option A
Explanation:
Dry ice, sometimes referred to as “cardice” (chiefly by British chemists), is the solid form of carbon dioxide. It is used primarily as a cooling agent.

1. The mass of the electrons in an atom is generally regarded as

A. Significant B. Unknown C. Comparable to the mass of the nucleus D. Insignificant

Answer: Option D
Explanation:
The mass of the electrons in an atom is generally regarded as Insignificant because the masses of electrons are regarded as zero because they are so small.
2. Foods that are acidic can be identified by their ................ taste

A. Salty B. Bitter C. Sour D. Sweet

Answer: Option C
Explanation:
In general Foods that are acidic can be identified by their Sour taste.
3. When a bee sitting ................................... compound it injects

A. Acetic Acid B. Formic Acid C. Sulphuric Acid D. Butyric Acid

Answer: Option B
Explanation:
Bee venom contains formic acid (also known as methanoic acid) but this is not the single active ingredient that causes the pain from a bee sitting.
4. The main ingredient in most antifreezes is

A. Glycerol B. Ethanol C. Ethylene Glycol D. Gasoline

Answer: Option C
Explanation:
Ethylene glycol Source Ethylene glycol is the main ingredient in most antifreeze products.
5. Protiens are ...............................

A. Polysaccharides B. Polyamines C. Polysulfides D. Polyamides

Answer: Option D
Explanation:
A protein is actually a polyamide .Polyamides occur both naturally and artificially. Examples of naturally occurring polyamides are proteins, such as wool and silk.
6. .............................. is a blood agent poison

A. Nitrate B. Cyanide C. Nicotine D. Sulfuric Acid

Answer: Option A
Explanation:
Thue blood agents are poisons that effectively cause the body to suffocate. Ex : Nitrate
7. Which of the following is a naturally occurring polymer ?

A. Composites B. Starch C. Nylon D. All of these

Answer: Option B
Explanation:
Naturally occurring polymers such as cotton, starch and rubber.
8. ..................... is a non-metal

A. Chlorine B. Magnesium C. Calcium D. Calcium

Answer: Option A
Explanation:
Chlorine displaces the less electronegative Bromine and Iodine from their respective salts. [latex]{C}_{2}[/latex]2 + 2 KBr ==> 2 KCl + B[latex]{r}_{2}[/latex]2 Chlorine removes Hydrogen from the hydrides of non - metals, forming Hydrogen Chloride, and leaving the non - metal element.
9. Lemon juice has a sour taste. It is .............................

A. Basic B. Acidic C. Caustic D. Neutral

Answer: Option B
Explanation:
Acidic bodies are unhealthy bodies. When the body is overly acidic, it creates an unwanted environment where illness, bacteria, and yeast thrive.
10. Which is not a characteristic of acids?

A. React with bases to form Salt B. React with active metal to form [latex]{H}_{2}[/latex] gas C. Turn litmus Red D. Taste Bitter

Answer: Option A
Explanation:
General Characteristics of Acids:

• pH < 7.


• Sour taste (though you should never use this


• characteristic to identify an acid in the lab)


• Reacts with a metal to form hydrogen gas.


• Increases the H+ concentration in water.


• Donates H+ ions.


• Turns blue litmus indicator red.

11. Which one of the following is the largest composition of Coal gas ?

A. Nitrogen B. Hydrogen C. Methane D. Oxygen

Answer: Option C
Explanation:
Methane, Carbon Monoxide and Hydrogen are the major constituent in coal gas.
12. .......................... is/ are an allotrope of carbon

A. Graphene B. Diamond C. Graphite & Fullerenes D. All of these

Answer: Option D
Explanation:
The allotropes of carbon include diamond (where the carbon atoms are bonded together in a tetrahedral lattice arrangement),graphite (where the carbon atoms are bonded together in sheets of a hexagonal lattice), graphene (single sheets of graphite), and fullerenes (where the carbon atoms are bonded.
13. The yellow colour of Topaz crystal is due to the presence of .........................

A. Ferrous Oxide B. Nitrogen Oxide C. Calcium Oxide D. Aluminum fluorosilicate

Answer: Option D
Explanation:
The yellow colour of Topaz crystal is due to the presence of Aluminum fluorosilicate.
14. A mixture of ................ % of Oxygen and .........% of Carbon-di-oxide is called carbogen

A. 80,20 B. 5,90 C. 95,5 D. 35,65

Answer: Option C
Explanation:
Carbogen, also called Meduna’s Mixture after its inventor Ladislas Meduna, is a mixture of carbon dioxide and oxygen gas. A carbogen mixture of 95% oxygen and 5% carbon dioxide used.
15. Which inert gas is present in the atmospheric air in negligible quantity?

A. Argon B. Helium C. Neon D. Radon

Answer: Option D
Explanation:
Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as a decay product of radium
16. Limestone added as ...................... in the extraction of iron

A. Flux B. Slag C. Gangue D. Catalyst

Answer: Option A
Explanation:
Limestone used as a flux which is used to remove impurities (such as silica (SiO2)) in the ore to forms a slag which melts and collects above the iron at the bottom of the furnace.
17. Starch Iodide paper is used for the test of ....................

A. Reducing agent B. Oxidizing agent C. Chlorine D. Nitrogenoxides

Answer: Option B
Explanation:
Starch iodide paper is an indicator for strong oxidising agents.
18. ................. was the first organic compound to be synthesized in laboratory from non-living sources

A. Etahne B. Alcohol C. Ether D. Urea 5.None of these

Answer: Option D
Explanation:
Urea was the first organic compound to be prepared in lab.
19. Solder is an alloy of ....................

A. Copper and Tin B. Copper and Zinc C. Lead and Tin D. Copper and Zinc

Answer: Option C
Explanation:
Electrical solder is an alloy of tin and lead. Solder can be made by heating together the metals lead and tin.
20. Calorific Value of wood is ......................

A. 17 kJ/g B. 27 kJ/g C. 42 kJ/g D. 35 kJ/g

Answer: Option A
Explanation:
Calorific Value of wood is 17-18 kJ/g.

1. ................ Is the purest form of Iron

A. Wrought Iron B. Pig Iron C. Cast Iron D. Steel

Answer: Option A
Explanation:
wrought iron contains 0.12 to 0.25% carbon and it is the purest form of iron.
2. A solid may be made up of ....................

A. Atoms B. Ions C. Molecules D. All of these

Answer: Option D
Explanation:
A solid may be made up of Atoms Ions Molecules.The forces between the atoms in a solid can take a variety of forms.
3. Of the 20 amino acids in your body’s proteins ........... are essential to your diet

A. 3 B. 6 C. 2 D. 9

Answer: Option D
Explanation:
4. Bucky balls is an allotropic form of which of the following ?

A. Oxygen B. Carbon C. Hydrogen D. Calcium

Answer: Option B
Explanation:
Spherical fullerenes are also called Buck minster fullerene (buckyballs), and they expanded the number of known carbon allotropes.
5. ........................ is made up of Toluene

A. Acetone B. Propane C. Phenol D. Saccharin

Answer: Option D
Explanation:
Saccharin is an artificial sweetener with effectively no food energy which is about 300–400 times as sweet as sucrose or table sugar. It is made from Toluene.
6. Angle in water molecule is ........................

A. 104.[latex]{5}^{0}[/latex] B. 100.[latex]{5}^{0}[/latex] C. 140.[latex]{5}^{0}[/latex] D. 105.[latex]{4}^{0}[/latex]

Answer: Option A
Explanation:
The result is a distorted tetrahedral arrangement in which the H—O—Hangle is 104.[latex]{5}^{0}[/latex].
7. .............. isotopes have odd atomic number

A. 67 B. 73 C. 86 D. 58

Answer: Option C
Explanation:
So far 86 isotopes have odd atomic number
8. ............. Percentage of calcium in calcium carbonate

A. 40% B. 35% C. 55% D. 60%

Answer: Option A
Explanation:
In 1500mg Calcium carbonate contain 40% calcium.
9. The diameter of an atom ranges from ...................

A. 0.001nm to 0.004nm B. 0.02nm t0 0.05nm C. 0.1nm to 0.5nm D. 0.1nm to 0.2nm

Answer: Option C
Explanation:
An atom is a million times smaller than the thickest human hair. The diameter of an atom ranges from about 0.1 to 0.5 nanometers (1 × 10-10 m to 5 × 10-10 m).
10. 1Which is Carnalite ?

A. KMgC[latex]{l}_{3}[/latex] [latex]{H}_{2}[/latex]O B. KMgCl3 6([latex]{H}_{2}[/latex]O). C. KCl3 4([latex]{H}_{2}[/latex]O). D. KMg [latex]{H}_{2}[/latex]O

Answer: Option B
Explanation:
Carnallite is an evaporite mineral, a hydrated potassium magnesium chloride with formula KMgCl3 6([latex]{H}_{2}[/latex]O). It is variably colored yellow to white, reddish, and sometimes colorless or blue.
11. Who suggested that matter possesses dual nature

A. De-Broglie B. Planck C. Heisenberg D. Newton

Answer: Option A
Explanation:
De-Broglie suggested that matter possesses dual nature. It has wave nature as well as particle nature.
12................. is a technique in which solvent molecules moves from the solution of higher concentration to lower concentration

A. Steam Distillation B. Reverse Osmosis C. Crystallization D. Chromatography

Answer: Option B
Explanation:
Reverse Osmosis is a technique in which solvent molecules moves from the solution of higher concentration to lower concentration when they are separated by semipermeable membrane and excess pressure is applied to the higher concentration solution.
13. Catalysis is called ................... When reactant and Catalyst are in the same phase

A. Heterogeneous B. Autocatalysis C. Corrosion D. Homogenous

Answer: Option D
Explanation:
Catalysis is called Homogenous When reactant and Catalyst are in the same phase Catalysis is called Heterogenous When reactant and Catalyst are in a different phase.
14. Which Charcoal adsorbs coloring matter and odoriferous gases?

A. Activated Charcoal B. Animal Charcoal C. Wood Charcoal D. All of these

Answer: Option C
Explanation:
Wood Charcoal adsorbs coloring matter and odoriferous gases, thus used in decolorising sugar solutions and in gas masks.
15. .................. is used as a solvent for Oil fat and in dry cleaning

A. [latex]{C}_{6}[/latex] [latex]{H}_{6}[/latex] B. [latex]{C}_{6}[/latex] [latex]{H}_{12}[/latex][/latex] [latex]{O}_{6}[/latex] C. [latex]{C}_{6}[/latex] [latex]{H}_{5}[/latex]OH D. [latex]{C}_{2}[/latex] [latex]{H}_{6}[/latex]OH

Answer: Option A
Explanation:
Benzene([latex]{C}_{6}[/latex] H6) is used as a solvent for Oil fat and in dry cleaning.Sodium Benzoate is a food preservative
16. .................. is also called as Marsh gas

A. Propane B. Methylene C. Ethane D. Methane

Answer: Option D
Explanation:
Marsh gas, which is also called methane, is produced by the anaerobic bacterial decomposition of vegetable matter and the rumen of herbivorous animals.
17. Catalysis is called ................... When one of the product increases the rate of the reaction

A. Heterogeneous B. Autocatalysis C. Corrosion D. Homogenous

Answer: Option B
Explanation:
Catalysis is called Autocatalysis When one of the product increases the rate of the reaction.
18. .................... is required to separate the ions of an ionic compound

A. Electronic Energy B. Lattice Energy C. Kinetic Energy D. Potential Energy

Answer: Option B
Explanation:
Lattice energy is a measure of the energy contained in the crystal lattice of a compound, equal to the energy that would be released if the component ions were brought together from infinity.This energy is required to separate the ions of an ionic compound.
19. Munz metal is an alloy of ...............................

A. Copper and Tin B. Lead and Copper C. Copper and Zinc D. Lead and Tin

Answer: Option C
Explanation:
Munz metal is an alloy of Copper(60%) and Zinc(40%).It is used for making coins
20. Which is used to determine the electronic configuration of an atom ?

A. Heisenberg Principle B. De-Brogile concept C. Planck’s Quantum theory D. Aufbau Principle

Answer: Option D
Explanation:
The Aufbau principle determines an atom’s electron configuration by adding electrons to atomic orbitals following a defined set of rules.

1. ....................... having strongest intermolecular forces of attraction

A. Iodine B. Sodium C. Pottasium D. Carbon

Answer: Option A
Explanation:
These forces are strongest in large, polarizable molecules.Iodine (I2) is a nonpolar molecule, but it is large (MW: 253.8 g/mol) and has a very polarizable electron cloud.
2. Which of the following is used for artificial fruit ripening of green fruit?

A. Methane B. Ethylene C. Methylene D. Propane

Answer: Option B
Explanation:
Blackberries at various stages of ripeness: unripe (green), ripening (pink and red), when green and artificially ripened after shipment by being gassed with ethylene.
3. The Radioactive element ......................... used in heart pacemaker

A. Actinium B. Thorium C. Radium D. Uranium

Answer: Option D
Explanation:
Plutonium is formed in nuclear power reactors from uranium. Early heart pacemakers used Pu-238 as the power source.
4. Galvanized iron is made by coating iron with .................

A. Aluminum B. Magnesium C. Zinc D. Potassium Carbonate

Answer: Option C
Explanation:
Galvanizing is a process of coating iron or steel with zinc in order to provide greater protection against corrosion for the iron or steel base.
5. Water has a maximum density at

A. [latex]{4}^{0}[/latex]C B. [latex]{13}^{0}[/latex]C C. [latex]{10}^{0}[/latex]C D. [latex]{7}^{0}[/latex]C

Answer: Option A
Explanation:
Basically, at 4 degrees C, the water molecules still have enough energy to move around, but the strength of the hydrogen bonds keep the molecules close together.Hence Water has a maximum density at [latex]{4}^{0}[/latex]C.
6. ................... has same isotopes like Palladium

A. Sodium B. Magnesium C. Calcium D. Potassium

Answer: Option C
Explanation:
Calcium isotopes (mainly Ca-42, Ca-44, Ca-46, and Ca-48) are used extensively in clinical research and mainly in nutritional studies and it has the same isotopes like Palladium
7. Cinnabar is an ore of which of the following?

A. Zinc B. Lead C. Tin D. Mercury

Answer: Option D
Explanation:
Cinnabar is a toxic mercury sulfide mineral with a chemical the composition of HgS.
8. .................. is a minute amount of a radioisotope

A. Pint B. Tracer C. Radium D. Isobar

Answer: Option B
Explanation:
A trace radioisotope is a radioisotope that occurs naturally in trace amounts (i.e., extremely small).
9. The Composition of tritium is ........................

A. 1 electron, 2 proton, 1 neutrons B. 2 electron, 1 proton, 1 neutrons C. 1 electron, 1 proton, 2 neutrons D. 2 electron, 2 proton, 2 neutrons

Answer: Option C
Explanation:
Tritium atom contains one proton, two neutrons, and one electron.
10. .............. is the Triple point of water

A. 273K B. 373K C. 300K D. 424K

Answer: Option A
Explanation:
The triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. The triple point of water is 273K.
11. The Water gas compositions are........................

A. Carbon-di-oxide and Oxygen B. Carbon monoxide and Hydrogen C. Carbon monoxide and Nitrogen D. Carbon-di-oxide and Oxygen

Answer: Option B
Explanation:
water gas is a mixture of hydrogen and carbon monoxide.
12. The irritation caused by red ants bite due to which of the following?

A. Acetic acid B. Oxalic acid C. Malonic acid D. Formic acid

Answer: Option D
Explanation:
Formicine ants can cause irritation by spraying formic acid.
13. The molecular weight of cellulose varies between ..................

A. 10000 to 100000 B. 50000 to 500000 C. 20000 to 500000 D. 20000 to 100000

Answer: Option C
Explanation:
The molecular weight of cellulose varies between 20000 and 500000.
14. Which acid is used in ink remover?

A. Acetic acid B. Oxalic acid C. Malonic acid D. Formic acid

Answer: Option B
Explanation:
Oxalic acid effectively removes ink, food stains, and many other types of stains.
15. .................. is the strongest reducing agent

A. K B. Mg C. Cu D. Ag

Answer: Option A
Explanation:
The strongest oxidizing agent is fluorine. The strongest reducing agent is Potassium.
16. The Unit of dipole moment is ...............

A. Debey B. Newton C. Weber D. Fermi

Answer: Option A
Explanation:
The Debye (symbol: D) is a CGS unit of electric dipol named in honor of the physicist Peter J. W. Debye. It is defined as 1×[latex]{10}^{-18}[/latex].
17. Empirical formula for Chloroform is ........................

A. CH[latex]{C}_{11}[/latex] B. C[latex]{H}_{2}[/latex][latex]{C}_{11}[/latex] C. C[latex]{H}_{2}[/latex][latex]{C}_{12}[/latex] D. CH[latex]{C}_{13}[/latex]

Answer: Option D
Explanation:
Chloroform is an organic compound with formula CHClatex]{L}_{3}[/latex]. It is a colorless, sweet-smelling, dense liquid that is produced on a large scale as a precursor to PTFE and refrigerants, but the latter application is declining.
18. Which metal forms an amalgam with other metal?

A. Aluminum B. Tin C. Mercury D. Lead

Answer: Option C
Explanation:
An amalgam is a substance formed by the reaction of mercury with another metal. Almost all metals can form amalgams with mercury.
19. The Viscosity of solid is ...................

A. Infinite B. Zero C. Maximum D. Minimum

Answer: Option A
Explanation:
when the viscosity is infinite, an infinitely sticky material cannot flow at all and so is solid
20. The natural gas is formed primarily of

A. Butane B. Ethane C. Methane D. Propane

Answer: Option B
Explanation:
The natural gas is formed primarily of methane, it can also include ethane, propane, butane, and pentane.

1. Fermentation of milk to curd is due to .............................

A. Pseudomonas B. Micrococci C. Sporogenes D. Lactobacillus

Answer: Option D
Explanation:
Milk is converted into curd by the process of fermentation. When milk is heated and little curd is added the – the curd containing Lactobacillus multiplies in milk and thus milk is converted into curd.
2. The natural source of Hydrocarbon is ...............

A. Crude oil B. Waxes C. Biomass D. Coal

Answer: Option A
Explanation:
The natural source of Hydrocarbon is Crude Oil.
3. The acid used in the lead storage cell is

A. Nitric Acid B. Hydrochloric Acid C. Sulphuric Acid D. Lactic Acid

Answer: Option C
Explanation:
Dilute sulfuric acid (H2SO4) serves as the electrolyte in the lead storage cells.
4. PVC is obtained by the polymerization of ..............................

A. Methyl Methacrylate B. Vinyl Chloride C. Nylon D. Polyethylene

Answer: Option B
Explanation:
Poly(vinyl chloride) is the plastic known at the hardware store as PVC. This is the PVC from which pipes are made, and PVC pipe is everywhere.
5. Plasma is used in ....................

A. Fluorescent bulb B. Halogen lamp C. Metal halide lamp D. Solar lights

Answer: Option A
Explanation:
Electrons collide with and ionize noble gas atoms inside the bulb surrounding the filament to form a plasma by the process of impact ionization.
6. .................. is the most reactive allotropic form of phosphorous

A. Yellow Phosphorous B. White Phosphorous C. Red Phosphorous D. Violet Phosphorous

Answer: Option B
Explanation:
White phosphorus is the least stable, the most reactive, the most volatile, the least dense, and the most toxic of the allotropes. White phosphorus gradually changes to red phosphorus.
7. The Processes of effusion and diffusion are best understand by

A. Maxwell Equations B. Dalton’s law C. Graham’s law D. Charle’s Law

Answer: Option C
Explanation:
Graham’s law’, known as Graham’s law of effusion, was formulated by Scottish physical chemist Thomas Graham in 1848.
Rate1/Rate 2 = [latex]\sqrt{M2} [/latex]/ [latex]\sqrt{M1} [/latex]
8. Elements having high IP values are

A. Metals B. Non Metals C. Alkali D. Metalloids

Answer: Option B
Explanation:
The nonmetals like neon, Ne, fluorine, F, and oxygen, O, have relatively high Ionization Potential
9. Who made volume and pressure correction to explain deviation of gases from ideal behaviour?

A. Robert Hooke B. Charles C. Joseph Louis Gay-Lussac D. Vander Waal

Answer: Option D
Explanation:
The van der Waals equation is an equation relating the density of gases and liquids to the pressure (p), volume (V), and temperature (T) conditions.It can be viewed as an adjustment to the ideal gas law that takes into account the non-zero volume of gas molecules, which are subject to a inter-particle attraction.
10. No change in atomic number is observed during ................. emission

A. Alpha B. Beta C. Gamma D. All of these

Answer: Option C
Explanation:
Gamma decay Emits energy but Neither a proton nor a neutron is lost.
11. ..................... is the constituent of tear gas

A. Ether B. Chloropicrin C. Ethanol D. Ethane

Answer: Option B
Explanation:
Chloropicrin, a component of tear gas, is used as a warning agent.
12. Which Vitamin requires Cobalt for its activity?

A. Vitamin [latex]{B}_{12} [/latex] B. Vitamin [latex]{B}_{4} [/latex] C. Vitamin A D. Vitamin [latex]{B}_{10} [/latex]

Answer: Option A
Explanation:
Although Cobalt has little direct activity of its own in the body, it is an integral component of Vitamin [latex]{B}_{12} [/latex]
13. Which of the following is is the densest naturally occurring element?

A. Platinum B. Aluminum C. Osmium D. Uranium

Answer: Option C
Explanation:
Osmium is the densest naturally occurring element, with a the density of 22.59 g/[latex]{m}^{3} [/latex]
14. To avoid melting of ice ................... is used

A. Butane B. Methane C. Acetic acid D. Gelatine

Answer: Option D
Explanation:
Gelatin is used to achieve a smooth gel texture and prevent exudation on freezing.
15. The temperature of the oxy-acetylene flame is ....................

A. [latex]{2800}^{0} [/latex]C B. [latex]{3200}^{0} [/latex]C C. [latex]{4000}^{0} [/latex]C D. [latex]{1800}^{0} [/latex]C

Answer: Option B
Explanation:
Oxygen-acetylene combination produces the highest temperature of around [latex]{3200}^{0} [/latex]C.
16. ........................... is used to check water pollution caused by industrial effluents

A. Water Hyacinth B. Parthenium C. Elephant Grass D. All of these

Answer: Option A
Explanation:
Water Hyacinth is used to check water pollution caused by industrial effluents
17. Acetic acid on decarboxylation gives which of the following ?

A. Ethane B. Propane C. Butane D. Methane

Answer: Option D
Explanation:
Acetic acid on decarboxylation gives Methane
18. .................. is obtained as slag in a blast furnace ?

A. Calcium Sulphate B. Calcium Oxide C. Calcium Silicate D. Calcium Chloride

Answer: Option C
Explanation:
Calcium silicate hydrate (CSH) solids were prepared from hydrated lime and iron blast furnace slag in an aqueous agitated slurry at 92 degrees
19. Drying oils contain a large proportion of

A. Cholesterol B. Unsaturated fatty acids C. Fats D. Protein

Answer: Option B
Explanation:
Drying oils contain a large proportion of unsaturated acids like linoleic and linolenic acids. These oils are valuable in paint industry Fatty acids containing double bonds are termed unsaturated.
20. ......................... are used as fuel in propellant of rockets

A. Liquid Hydrogen+Liquid Nitrogen B. Liquid Argonn+Liquid Oxygen C. Liquid Nitrogen+Liquid Oxygen D. Liquid Hydrogen+Liquid Oxygen D. Protein

Answer: Option D
Explanation:
LOX and liquid hydrogen, used in the Space Shuttle orbiter.