1. Bleaching powder is soluble in cold water giving a milky solution due to – A. available chlorine B. lime present in it C. calcium carbonate formation D. the absorption of carbon dioxide from atmosphere Ans: B
2. The acid used in making of vinegar is – A. formic acid B. acetic acid C. sulphuric acid D. nitric acid Ans: B
3. Reaction of an acid with a base is known as – A. decomposition B. combination C. redox reaction D. neutralization Ans: D
4. Antacids contain – A. weak base B. weak acid C. strong base D. strong acid Ans: A
5. Bleaching powder gives smell of chlorine because it – A. is unstable B. gives chlorine on exposure to atmosphere C. is a mixture of chlorine and slaked lime D. contains excess of chlorine Ans: B
6. Plaster of paris is made from – A. lime stone B. slaked lime C. quick lime D. gypsum Ans: D
7. Chemical formula of baking soda is – A. MgSO₄ B. Na₂CO₃ C. NaHCO₃ D. MgCO₃ Ans: C
8. Washing soda has the formula – A. Na₂CO₃.7H₂O B. Na₂CO₃.10H₂O C. Na₂CO₃.H₂O D. Na₂CO₃ Ans: B
9. Plaster of Paris hardens by – A. giving of CO₂ B. changing into CaCO₃ C. combining with water D. giving out water Ans: C
10. A solution reacts with crushed egg–shells to give a gas that turns lime–water milky. The solution contains A. NaCl B. HCl C. LiCl D. KCl Ans: B
11. Which of the following is acidic in nature – A. apple juice B. soap solution C. slaked lime D. lime Ans: B
12. Which of the following acid is present in sour milk ? A. glycolic acid B. lactic acid C. citrus acid D. tartaric acid Ans: B
13. Acid turn blue litmus – A. green B. red C. yellow D. orange Ans: B
14. The reaction of metal with acid results in the formation of– A. only hydrogen gas B. only salt C. both salt and hydrogen gas D. none of these Ans: C
15. ‘Alum’ is an example of – A. single salt B. double salt C. acids D. none of these Ans: B
16. Which of the following is ‘quicklime’ – A. CaO B. Ca(OH)₂ C. CaCO₃ D. CaCl₂.6H₂O Ans: A
17. Slaked lime is prepared by adding water to – A. bleaching powder B. lime water C. milk of lime D. quicklime Ans: D
18. Plaster of paris is obtained – A. by adding water to calcium sulphate B. by adding sulphuric acid to calcium hydroxide C. by heating gypsum to a very high temperature D. by heating gypsum to 373 K. Ans: D
19. Which of the following is considered a mineral acid? A. Oxalic acid B. Lactic acid C. Citric acid D. Phosphoric acid Ans: D
20. Which of the following is an alkali ? A. Ca(OH)₂ B. KOH C. Mg(OH)₂ D. CaCO₃ Ans: B
21. When the stopper of a bottle containing colourless liquid was removed, the bottle gave smell like that of vinegar. The liquid in the bottle could be A. hydrochloric acid B. sodium hydroxide solution C. acetic acid solution D. saturated sodium hydrogen carbonate solution Ans: C
22. Which of the following is not required to find the pH of a given sample ? A. pH paper B. Litmus paper C. Universal indicator D. Standard pH chart Ans: B
23. Universal indicator solution is named as such because A. it is available universally B. it has a universal appearance C. it can be used for entire pH range D. all the above are correct Ans: C
24. Select the one that is having pH < 7. A. lime juice B. lime water C. human blood D. antacid Ans: A
25.Acids and bases are important because of A. their use in industry B. their effects on human health C. their effect on farmer’s crop D. all the above are correct. Ans: D
26. Which of the following is a weak base ? A. NaOH B. KOH C. NH₄OH D. none of these Ans: C
27. Which of the following compounds is basic in nature ? A. Ca(OH)₂ B. CaCl₂.6H₂O C. NaCl D. CuSO₄.5H₂O Ans: A
28. If pH of A, B, C and D are 9.5, 2.5, 3.5 and 5.5 respectively, then strongest acid is A. A B. C C. D D B Ans: D
29. Aqueous solution of which of the following salt will change the colour of red litmus to blue? A. Na₂CO₃ B. Na₂CO3.10H₂O C. Both (A) and (B) D. None of these Ans: C
30. Which of the following is known as dead burnt plaster? A. Quicklime B. Slaked lime C. Limestone D. Gypsum Ans: B
31. Which of the following pairs of substances are chemically same? A. Lime water and milk of lime B. Dead burnt plaster and gypsum C. Both the above D. None of the above Ans: A
32. Baking powder is A. a mixture B. a compound C. an element D. a salt Ans: A
33. The chemical name of bleaching powder is A. calcium chloride B. calcium oxychloride C. calcium chloroxide D. none of above Ans: B
34. Which of the following is not a hydrated salt? A. Blue vitriol B. Baking soda C. Washing soda D. Epsom salt Ans: B
35. Which of the following is a strong acid: A. Acetic acid B. Citric acid C. Nitric acid D. Tartaric acid Ans: C
36.The presence of which of the following acid causes indigestion: A. Citric acid B. Oxalic acid C. Acetic acid D. Hydrochloric acid Ans: D
37. When few drops of lemon are mixed with milk (i) it turns sour (ii) no change takes place (iii) properties of milk are changed (iv) properties of milk remain same Which of the above statements is/are correct? A. (ii) and (iii) B. (i) and (ii) C. (i) and (iii) D. (i) only Ans: C
38. Which of the following is a strong base? A. Ammonium hydroxide (NH₄OH) B. Sodium hydroxide (NaOH) C. Water (H₂O) D. Sulfuric acid (H₂SO₄) Ans: B
39. Acids are ......... in taste while bases are......... in taste A. sweet, salty B. sweet, sour C. sour, salty D. sour, bitter Ans: D
40. A base which dissolves in water is called A. soluble base B. alkali C. acid D. oxide Ans: B
41. Acid rain is caused due to ............ A. CO₂, O₂, SO₂ B. CO₂, NO₂, H₂ C. SO₂ N₂, O₂ D. CO₂, SO₂, NO₂ Ans: D
42. Acid contained in the sting of an ant is....... A. acetic acid B. formic acid C. lactic acid D. ascorbic acid Ans: B
43. Natural indicator litmus is extracted from A. lichens B. earthworms C. ants D. algae Ans: A
44. When vinegar reacts with baking soda the gas evolved is A. hydrogen B. oxygen C. carbon dioxide D. nitrogen dioxide Ans: C
45. On which of the following acid rain has adverse effects? A. Marble structures B. Historical monuments C. Aquatic life D. All of these Ans: D
46. pH of human body varies within the range of A. 6.0 to 6.5 B. 5.5 to 5.8 C.7.0 to 7.8 D. 7.0 to 11.0 Ans: C
47. Calamine solution contains A. zinc hydroxide B. zinc carbonate C. sodium hydrogen carbonate D. magnesium hydroxide Ans: B
48. Why bases are kept in glass bottles? A. Bases produce OH– ions in aqueous solutions B. Basic solutions are conducting in nature C. Bases are corrosive in nature D. Basis have soapy texture Ans: C
49. Which of the following statement regarding bases is false? A. Bases produce hydroxide ions when dissolved in water B. Bases are soapy to touch C. Bases are extremely corrosive in nature D. Basic solutions are non conducting in nature Ans: D
50. Which of the following statement is true? A. Acids are bitter in taste B. Bases are sour in taste C. The reaction between acid and a base is exothermic reaction D. The reaction between an acid and a base is endothermic reaction. Ans: C
51. Common salt besides being used in kitchen can also be used as the raw material for making (i) washing soda (ii) bleaching powder (iii) baking soda (iv) slaked lime A. (i) and (ii) B. (i), (ii) and (iv) C. (i) and (iii) D. (i), (iii) and (iv) Ans: C
52. To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is A. acidic B. neutral C. basic D. corrosive Ans: C