Class X Science
Subject: Chemistry
Acids, Bases and Salts
Q. 1. Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste due to the presence of:(A) Acetic acid
(B) Citric acid
(C) Lactic acid
(D) Oxalic acid
Right Ans:- Citric acid
Q. 2. Which of the following phenomena occur, when a small amount of acid is added to water?
i. Ionisation
ii. Neutralisation
iii. Dilution
iv. Salt formation
(A) (i) and (ii)
(B) (i) and (iii)
(C) (ii) and (iii)
(D) (ii) and (iv)
Right Ans:- (i) and (iii)
Q. 3. Which of the following indicators turn red in an acidic solution?
(i) Phenolphthalein
(ii) Litmus
(iii) Turmeric
(iv) Methyl orange
Choose the correct option:
(A) (i) and (ii)
(B) (ii) and (iii)
(C) Only (ii)
(D) (ii) and (iv)
Right Ans:- (ii) and (iv)
Q. 4. Dilute acid does not produce carbon dioxide on being treated with:
(A) Marble
(B) Lime
(C) Baking soda
(D) Limestone
Right Ans:- Lime
Q. 5. The sample of soil from a particular place was tested for its pH value. It came out to be 5. Which one of the following should be added to the soil to make it suitable for the plant growth?
i. Calcium chloride
ii. Calcium Hydroxide
iii. Calcium oxide
Choose the correct option:
(A) Both (i) and (ii)
(B) Both (ii) and (iii)
(C) Only (i)
(D) Only (iii)
Right Ans:- Both (ii) and (iii)
Q. 6. An ant’s sting can be treated with________which will neutralise the effect of the chemical injected by the ant’s sting into our skin. Choose the correct option from the following to be filled in the blank space:
(A) Methanoic acid
(B) Formic acid
(C) Baking soda
(D) Caustic soda
Right Ans:- Baking soda
Q. 7. In the following reaction, identify the salt formed:-
NH4OH (aq) + H2SO4 (aq) → ______ + 2H2O (l)
(A) NH4NO3
(B) (NH4)2SO4
(C) (NH4)3PO4
(D) (NH4)2S
Right Ans:- (NH4)2SO4
Q. 8. Which of the following salt will give acidic solution when dissolved in water?
(A) NH4Cl
(B) NaCl
(C) Na2CO3
(D) CH3COONa
Right Ans:- NH4Cl
Q. 9. Bleaching powder is used as a disinfectant for water to:
(A) Make water tastier
(B) Remove all the dirt from water
(C) Make water germ-free
(D) Make water clear
Right Ans:- Make water germ-free
Q. 10. Copper sulphate crystals when heated strongly, lose their water of crystallization to give anhydrous copper sulphate accompanied by a change in color from:
(A) Blue to green
(B) Blue to white
(C) Blue to sky blue
(D) Blue to grey
Right Ans:- Blue to white
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