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Acids, Bases and Salts - 3
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Q1. Bleaching powder is used as a disinfectant for water to:
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1 point
a. Make water tastier
b. Remove all the dirt from water
c. Make water germ-free
d. Make water clear
Q2. Which one of the following salts will dissolve in water to form an alkaline solution?
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1 point
a. Potassium carbonate
b. Sodium chloride
c. Ammonium Chloride
Potassium Sulphate
Q3. Copper sulphate crystals when heated strongly, lose their water of crystallization to give anhydrous copper sulphate accompanied by a change in color from:
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1 point
a. Blue to green
b. Blue to white
c. Blue to sky blue
d. Blue to grey
Q4. What happens when a solution of an acid is mixed with a solution of a base in a test tube? (i) Temperature of the solution decreases (ii) Temperature of the solution increases (iii) Temperature of the solution remains the same (iv) Salt formation takes place
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1 point
(a) (i) and (iv)
(b) (i) and (iii)
(c) (ii) only
(d) (ii) and (iv)
Q5. When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guardtube containing calcium chloride. The role of calcium chloride taken in the guard tube is to -
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1 point
(a) absorb the evolved gas
(b) moisten the gas
(c) absorb moisture from the gas
(d) absorb Cl ions from the evolved gas
Q6. In terms of acidic strength, which one of the following is in the correct increasing order?
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1 point
(a) Water < Acetic acid < Hydrochloric acid
(b) Water < Hydrochloric acid < Acetic acid
(c) Acetic acid < Water < Hydrochloric acid
(d) Hydrochloric acid < Water < Acetic acid
Q7. Tomato is a natural source of which acid?
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1 point
(a) Acetic acid
(b) Citric acid
(c) Tartaric acid
(d) Oxalic acid
Q8. Brine is an -
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(a) aqueous solution of sodium hydroxide
(b) aqueous solution of sodium carbonate
(c) aqueous solution of sodium chloride
(d) aqueous solution of sodium bicarbonate
Q9. Na2CO3. 10H2O is
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(a) washing soda
(b) baking soda
(c) bleaching powder
(d) tartaric acid
Q10. At what temperature is gypsum heated to form Plaster of Paris?
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1 point
(a) 90°C
(b) 100°C
(c) 110°C
(d) 120°C
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