Q.1. Which one of the following is acidic?
(a) Lemon juice
Q.2. What is the pH value of sodium chloride?
(b) More than 7
(c) Less than 7
Q.3. Which one of the following will turn red litmus blue?
(b) Baking soda solution
(c) Lemon juice
(d) Soft drinks
Answer(b)Baking Soda solution
Q.4. What is the pH value of distilled water?
(b) More than 7
(c) Less than 7
Q.5. Which one of the following will turn blue litmus red?
(b) Lime water
(c) Baking soda solution
(d) Washing soda solution
Q.6. What happens when carbon dioxide gas reacts with sodium hydroxide?
(a) Carbon monoxide is formed
(b) Carbon dioxide is formed
(c) Sodium carbonate is formed
(d) Carbon dioxide does not react with sodium hydroxide
Answer(c) Sodium carbonate is formed
Q.7. Methyl orange is
(a) Pink in acidic medium, yellow in basic medium
(b) Yellow in acidic medium, pink in basic medium
(c) Colourless in acidic medium, pink in basic medium
(d) Pink in acidic medium, colourless in basic medium.
Answer(a)Pink in acidic medium, yellow in basic medium
Q.8. Which of the following gas if formed when an acid reacts with metal carbonate?
(a) Carbon monoxide
(b) Carbonic acid gas
(c) Carbon dioxide gas
(d) Hydrochloric acid gas
Answer(c) Carbon dioxide gas
Q.9. Lime water is
Q.10. The nature of calcium phosphate is present in tooth enamel is
Q.11. Which of the following salts has no water of crystallization?
(a) Blue vitriol
(b) Washing soda
(c) Baking soda
Q.12. The function of quick lime in soda lime mixture is to
(a) Absorb moisture present in soda lime
(b) Increase the efficiency of soda lime
(c) Increase the pH of soda lime
(d) Take part in reaction with NaOH
Answer(a) Absorb moisture present in soda lime
Q.13. Which of the following acid is also known as vinegar?
(a) Dilute hydrochloric acid
(b) Dilute sulphuric acid
(c) Dilute acetic acid
(d) Dilute tartaric acid
Answer(c) Dilute acetic acid
Q.14. The difference of molecules of water in gypsum and PoP is
Q.15. Which of the following is taken orally as medicine in the case of hyperacidity to get relief?
(a) Sodium hydroxide
(b) Calcium hydroxide
(c) Milk of sodium
(d) Milk of magnesia
Answer(d) Milk of magnesia
Q.16. Which of the following does not form an acidic salt?
(a) Phosphoric acid
(b) Carbonic acid
(c) Hydrochloric acid
(d) Sulphuric acid
Answer(b) Carbonic acid
Q.17. The chemical formula of caustic potash is
Q.18. What happens when excess of carbon dioxide gas is passed through lime water?
(a) Lime water first turns milky and then colorless
(b) Lime water turns bluish
(c) Lime water turns milky
(d) Lime water turns blackish
Answer(a) Lime water first turns milky and then colorless
Q.19. What happens when a base is added to vanilla?
(a) Color of vanilla changes into red
(b) Vanilla becomes colorless
(c) Vanilla loses its smell
(d) Nothing happens
Answer(c) Vanilla loses its smell
Q.20. Which of the following compound is formed when zinc reacts with hydrochloric acid?
(a) Zinc sulphate
(b) Zinc chloride
(c) Zinc carbonate
(d) Zinc hydroxide
Answer(b) Zinc chloride
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