MCQ Questions for Class 10 Science Chapter 2 Acids, Bases And Salts

Q.1.  Which one of the following is acidic?
(a) Lemon juice    
(b) Tomatoes    
(c) Milk    
(d) All

Answer (d)All

Q.2. What is the pH value of sodium chloride?
(a) 7
(b) More than 7
(c) Less than 7

Answer (a) 7

Q.3.  Which one of the following will turn red litmus blue?
(a) Vinegar    
(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?
(a) 7
(b) More than 7
(c) Less than 7

Answer (a) 7

Q.5.  Which one of the following will turn blue litmus red?
(a) Vinegar    
(b) Lime water    
(c) Baking soda solution    
(d) Washing soda solution

Answer (a)Vinegar

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
(a) CaO    
(b) Ca(OH)2    
(c) CaCO3    
(d) CaCI2

Answer (b) Ca(OH)2

Q.10.  The nature of calcium phosphate is present in tooth enamel is
(a) Basic    
(b) Amphoteric    
(c) Acidic    
(d) Neutral

Answer (a)Basic

Q.11.  Which of the following salts has no water of crystallization?
(a) Blue vitriol    
(b) Washing soda    
(c) Baking soda    
(d) Gypsum

Answer (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
(b) 2b    
(c) 3/2    
(d) ½

Answer (c) 3/2

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
(a) NaOH    
(b) Ca(OH)2    
(c) NH4OH    
(d) KOH

Answer (d) KOH

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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