1. The early attempt to classify elements as metals and nonmetals was made by (a) Mendeleev (b) Lother Meyer (c) Lavoisier (d) Henry Moseley Ans: C
2. Newlands could classify elements only upto (a) copper (b) chlorine (c) calcium (d) chromium Ans: C
3. Mendeleev classified elements in (a) increasing order of atomic groups (b) eight periods and eight groups (c) seven periods and eight groups (d) eight periods and seven groups Ans: C
4. The long form of periodic table consists of (a) seven periods and eight groups (b) seven periods and eighteen groups (c) eight periods and eighteen groups (d) eighteen periods and eight groups Ans: B
5. All the members in a group in long form of periodic table have the same (a) valence (b) number of valence electrons (c) chemical properties (d) All of these Ans: D
6. Which of the following properties generally decrease along a period? (a) Atomic size (b) Non-metallic character (c) Metallic character (d) Both (a) and (c) Ans: D
7. An element ‘M’ has an atomic number 9 and its atomic mass 19. The ion of M will be represented by (a) M (b) [latex]M^2+[/latex] (c) [latex]M^–[/latex] (d) [latex]M^2–[/latex] Ans: C
8. The element with smallest size in group 13 is (a) beryllium (b) carbon (c) aluminium (d) boron Ans: D
9. The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all (a) halogen (b) noble gases (c) noble metals (d) light metals Ans: B
10. The number of elements in the third period of periodic table is (a) 2 (b) 8 (c) 18 (d) 32 Ans: B
11. Which of these choices is not a family of elements? (a) Halogens (b) Metals (c) Inert gases (d) All of these Ans: B
12. The element which has least tendency to lose electron is (a) H (b) Li (c) He (d) Na Ans: C
13. The most metallic element in the fourth period is (a) Ca (b) K (c) S (d) P Ans: B
14. The elements of group sixteen are called (a) halogens (b) chalcogens (c) pnicogens (d) noble gases Ans: B
15. Which of the following is correct set of Dobereiner Triads? (a) Na, Si, Cl (b) Be, Mg, Ca (c) F, Cl, I (d) Li, Na, Be Ans: B
16. The metal which is hard and has high m.p. and used in electric bulbs is (a) Ni (b) Pt (c) Fe (d) W Ans: D
17. The lightest liquid metal is (a) Hg (b) Ga (c) Cs (d) Fr Ans: C
18. Which is not true about noble gases? (a) They are non-metallic in nature (b) They exist in atomic form (c) They are radioactive in nature (d) Xenon is the most reactive among them Ans: C
19. Elements of which group form anions most readily? (a) Oxygen family (b) Nitrogen family (c) Halogens (d) Alkali metals Ans: C
20. On moving horizontally across a period, the number of electrons in the outermost shell increases from ...... to ....... . (a) 2, 8 (b) 2, 18 (c) 1, 8 (d) 1, 18 Ans: C
21. Which of the following is not a representative element? (a) Fe (b) K (c) Ba (d) N Ans: A
22. The scientist who made maximum contribution towards periodic table was (a) Chadwick (b) Rutherford (c) Dalton (d) Mendeleev Ans: D
23. Which of the following elements A, B, C, D and E with atomic number 3, 11, 15, 18 and 19 respectively belong to the same group? (a) A, B, C (b) B, C, D (c) A, D, E (d) A, B, E Ans: D
24. Element A belongs to Group VII in p-block and element B belongs to Group I in s-block of the periodic table. Out of the following assumptions, the correct one is : (a) A and B are metals (b) A and B are non-metals (c) A is a metal and B is a non-metal (d) A is a non-metal and B is a metal Ans: D
25. The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong? (a) Metal (b) Metalloid (c) Non-metal (d) Left-hand side element Ans: B
26. Which of the following properties do not match elements of halogen family ? (a) They have seven electrons in their valence shell (b) They are diatomic in their molecular form (c) They are highly reactive chemically (d) They are metallic in nature Ans: D
27. Which fact is not valid for Dobereiner's triads? (a) The atomic weight of middle element is roughly average of the other two elements (b) The properties of middle element is roughly average of the other two elements (c) The elements of triads belong to the same group of modern periodic table (d) The elements of triads have same valency electrons Ans: B
28. Which of the following statements is incorrect from the point of view of modern periodic table ? (a) Elements are arranged in the order of increasing atomic number (b) There are eighteen vertical columns called groups (c) Transition elements fit in the middle of long periods (d) Noble gases are arbitrarily placed in eighteenth group Ans: D
29. Which of the following group of elements belongs to alkali metals? (a) 1, 12, 30, 4, 62 (b) 37, 19, 3, 55 (c) 9, 17, 35, 53 (d) 12, 20, 56, 88 Ans: B
30. Which of the following elements will form acidic oxide? (a) Sodium (b) Magnesium (c) Aluminium (d) Sulphur Ans: D
31. Which one of the following is most electropositive element? (a) Sodium (b) Calcium (c) Aluminium (d) Silicon Ans: A
32. The atomic number of an element tells you the number of ........... in a neutral atom. (a) positrons (b) neutrons (c) electrons (d) All of these Ans: C
33. As you move down the group, the alkali metals become (a) brighter (b) hotter (c) more reactive (d) less reactive Ans: C
34. Which is a metalloid? (a) Pb (b) Sb (c) Bi (d) Zn Ans: B
35. Which one of the following elements exhibit maximum number of valence electrons? (a) Na (b) Al (c) Si (d) P Ans: D
36. Which of the following elements does not lose an electron easily? (a) Na (b) F (c) Mg (d) Al Ans: B
37. To which block is related an element having electronic configuration [latex]1s^2[/latex] [latex]2s^2[/latex] [latex]2p^6[/latex] [latex]3s^2[/latex] [latex]3p^6[/latex] [latex]3d^10[/latex] [latex]4s^1[/latex] in the periodic table– (a) s–block (b) p–block (c) d–block (d) f–block Ans: A
38. If the valene shell electronic configuration for an element is [latex]ns^2[/latex][latex]np^5[/latex], this element will belong to the group of- (a) alkali metals (b) inert metals (c) noble gases (d) halogens Ans: D
39. Which shows variable valency – (a) s–block elements (b) p–block elements (c) d–block elements (d) Radioactive elements Ans: C
40. The noble gases are unreactive because (a) they react with sodium (b) they have a full outer shell of electrons (c) they have a half outer shell of neutrons (d) they are too thin Ans: B
41. Which scientist came up with the concept of a periodic table that included all of the known elements? (a) Joseph Priestly (b) Dmitri Mendeleev (c) Antoine Lavoisier (d) Albert Einstein Ans: B
42. If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is – (a) arsenic (b) sulphur (c) iodine (d) calcium Ans: A