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Class 10 Science
Chapter 2 Acids, Bases and Salts
Multiple Choice Questions
1. Which Acid is present in Tomato?
(A) Citric Acid
(B) Oxalic Acid
(C) Lactic Acid
(D) HCl
Ans: (B) Oxalic Acid
2. Which Acid is a strong Acid in the following?
(A) HCl pH 1
(B) CH3COOH pH 5
(C) Lemon juice pH 2.2
(D) Pure Milk pH 6
Ans: (A) HCl pH 1
3. Na2CO3.10H2O is known as-
(A) Baking Soda
(B) Baking Powder
(C) Washing Soda
(D) Bleaching Powder
Ans: (C) Washing Soda
4. Which salt is Neutral salt?
(A) NH4Cl
(B) CH3COONH4
(C) CH3COONa
(D) Na2CO3
Ans: (B) CH3COONH4
5. pH value less than 7 indicates that the solution is –
(A) Acidic
(B) Basic
(C) Neutral
(D) No effect
Ans: (A) Acidic
6. Lactic Acid is present in-
(A) Orange
(B) Tea
(C) Curd
(D) Vinegar
Ans: (C) Curd
7. Farmers neutralize the effect of Acidity on soil by adding
(A) Slaked Lime
(B) Gypsum
(C) Caustic Soda
(D) Baking Soda
Ans: (A) Slaked Lime
8. CuSO4.5H2O In this Compound the water molecule is called –
(A) Pure Water
(B) Water of Crystallisation
(C) Soda Water
(D) None of these
Ans: (B)Water of Crystallisation
9. In which pH range does our body work to survive in the atmosphere?
(A) 5.5 to 8.5
(B) 7.0 to 7.8
(C) 2.3 to 7.0
(D) 7.5 to 12.5
Ans: (B) 7.0 to 7.8
10. What is the chemical formula of POP (Plaster of Paris)?
(A) CaSO4.2H2O
(B) CaSO4.3H2O
(C) CaSO4.1/2H2O
(D) CaCO3.1/2H2
Ans: (C) CaSO4.1/2H2O
11. Which salt is Acidic in nature?
(A) NH4Cl
(B) CH3COONH4
(C) NaCl
(D)Na2CO3
Ans: (A) NH4Cl
12. When a base reacts with a metal, it forms a salt and hydrogen gas is released. By what method can the presence of hydrogen be detected?
(A) by water
(B) by litmus paper
(C) by methyl orange
(D) by a burning candle
Ans: (D) by a burning candle
13. The image shows the pH values of four solutions on a pH scale.
Which solutions are alkaline in nature?
(A) A and B
(B) B and C
(C) C and D
(D) A and D
Ans: (C) C and D
14. At what temperature is gypsum heated to form Plaster of Paris?
(A) 35°C (B) 70°C
(C) 80°C (D) 100°C
Ans: (D) 100°C
15. Sodium carbonate reacts with hydrochloric acid produces
(A) NaCl
(B) CO2
(C) H2O
(D) All of the above
Ans: (D) All of the above
16. Which Acid is present in Tamarind?
(A) Tartaric acid
(B) Oxalic Acid
(C) Lactic Acid
(D) Citric Acid
Ans: (A)Tartaric acacid
17. In terms of acidic strength, which one of the following is in the correct increasing order?
(A) Water < Acetic acid < Hydrochloric acid
(B) Water < Hydrochloric acid < Acetic acid
(C) Acetic acid < Water < Hydrochloric acid
(D) Hydrochloric acid < Water < Acetic acid
Ans: (A) Water < Acetic acid < Hydrochloric acid
18. What is formed when zinc reacts with sodium hydroxide?
(A) Zinc hydroxide and sodium
(B) Sodium zincate and hydrogen gas
(C) Sodium zinc-oxide and hydrogen gas
(D) Sodium zincate and water
Ans: (B) Sodium zincate and hydrogen gas
19. Brine is an
(A) aqueous solution of sodium hydroxide
(B) aqueous solution of sodium carbonate
(C) aqueous solution of sodium chloride
(D) aqueous solution of sodium bicarbonate
Ans: (C) aqueous solution of sodium chloride
20. Sodium carbonate is a basic salt because it is a salt of a
(A) strong acid and strong base
(B) weak acid and weak base
(C) strong acid and weak base
(D) weak acid and strong base
Ans: (D) weak acid and strong base
21. Alkalis are
(A) acids, which are soluble in water
(B) acids, which are insoluble in water
(C) bases, which are insoluble in water
(D) bases, which are soluble in water
Ans: (D) bases, which are soluble in water
22. Which of the following statements is correct about an aqueous solution of an acid and of a base?
(i) Higher the pH, stronger the acid
(ii) Higher the pH, weaker the acid
(in) Lower the pH, stronger the base
(iv) Lower the pH, weaker the base
(A) (i) and (iii) (B) (ii) and (iii)
(C) (i) and (iv) (D) (ii) and (iv)
Ans: (D) (ii) and (iv)
23. Lime water reacts with chlorine to give
(A) bleaching powder
(B) baking powder
(C) baking soda
(D) washing soda
Ans: (A) bleaching powder
24. Nettle sting is a natural source of which acid?
(A) Methanoic acid
(B) Lactic acid
(C) Citric acid
(D) Tartaric acid
Ans: (A) Methanoic acid
25. Tooth enamel is made up of
(A) calcium phosphate
(B) calcium carbonate
(C) calcium oxide
(D) potassium
Ans: (A) calcium phosphate
26. Rain is called acid rain when its:
(A) pH falls below 7
(B) pH falls below 6
(C) pH falls below 5.6
(D) pH is above 7
Ans: (C) pH falls below 5.6
27. Sodium hydroxide is a
(A) weak base
(B) weak acid
(C) strong base
(D) strong acid
Ans: (C) strong base
28. When copper oxide and dilute hydrochloric acid react, colour changes to
(A) white
(B) bluish-green
(C) blue-black
(D) black
Ans: (B) bluish-green
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