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Class 10 Science MCQs Chapter 2 Acids Bases and Salts
1. 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
(in) Temperature of the solution remains the same
(iv) Salt formation takes place
(a) (i) and (iv)
(b) (i) and (iii)
(c) (ii) only
(d) (ii) and (iv)
Answer
Answer: d
2. When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
(a) absorb the evolved gas
(b) moisten the gas
(c) absorb moisture from the gas
(d) absorb Cl– ions from the evolved gas
Answer/ Explanation
Answer: c
Explaination: Reason: Guard tube drys (absorbs water) from calcium chloride on a humid day.
3. Which one of the following salts does not con-tain water of crystallisation?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum
Answer
Answer: b
4. 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
Answer
Answer: a
5. 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
Answer/ Explanation
Answer: b
Explaination: Reason: Zn + 2NaOH → Ma2Zn02 (Sodium Zincate) + H2
6. Tomato is a natural source of which acid?
(a) Acetic acid
(b) Citric acid
(c) Tartaric acid
(d) Oxalic acid
Answer
Answer: d
7. 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
Answer
Answer: c
8. Na2CO3 . 10H2O is
(a) washing soda
(b) baking soda
(c) bleaching powder
(d) tartaric acid
Answer
Answer: a
9. At what temperature is gypsum heated to form Plaster of Paris?
(a) 90°C
(b) 100°C
(c) 110°C
(d) 120°C
Answer
Answer: b
10. How many water molecules does hydrated cal-cium sulphate contain?
(a) 5
(b) 10
(c) 7
(d) 2
Answer/ Explanation
Answer: d
Explaination: Reason: Chemical formula of hydrated calcium sulphate or gypsum is CaSO4.2H2O
11. 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
Answer
Answer: d
12. 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
Answer
Answer: d
13. 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)
Answer/ Explanation
Answer: d
Explaination: Reason: Stronger the acid, lesser is the pH. Stronger the base, higher is the pH.
14. The apparatus given in the adjoining figure was set up to demonstrate electrical conductivity.
Which of the following statement(s) is (are) correct?
(i) Bulb will not glow because electrolyte is not acidic.
(ii) Bulb will glow because HCl is a strong acid and furnishes ions for conduction.
(iii) Bulb will not glow because circuit is incomplete.
(iv) Bulb will not glow because it depends upon the type of electrolytic solution.
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (ii) only
(d) (iv) only
Answer
Answer: c
15. Lime water reacts with chlorine to give
(a) bleaching powder
(b) baking powder
(c) baking soda
(d) washing soda
Answer/ Explanation
Answer: c
Explaination:
16. Nettle sting is a natural source of which acid?
(a) MetiWanoic acid
(b) Lactic acid
(c) Citric acid
(d) Tartaric acid
Answer
Answer: a
17. Tooth enamel is made up of
(a) calcium phosphate
(b) calcium carbonate
(c) calcium oxide
(d) potassium
Answer
Answer: a
18. What is the pH range of our body?
(a) 7.0 – 7.8
(b) 7.2 – 8.0
(c) 7.0 – 8.4
(d) 7.2 – 8.4
Answer
Answer: a
19. 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
Answer
Answer: c
20. Sodium hydroxide is a
(a) weak base
(b) weak acid
(c) strong base
(d) strong acid
Answer/ Explanation
Answer: c
Explaination: Reason: Sodium hydroxide ionises in water and produces a large amount of hydroxide ions.
21. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
(a) Baking powder
(b) Lime
(c) Ammonium hydroxide solution
(d) Hydrochloric acid
Answer
Answer: d
22. When copper oxide and dilute hydrochloric acid react, colour changes to
(a) white
(b) bluish-green
(c) blue-black
(d) black
Answer/ Explanation
Answer: b
Explaination: Reason: Blue-green colour of solution is due to the formation of copper (II) chloride.
23. Sodium hydroxide is used
(a) as an antacid
(b) in manufacture of soap
(c) as a cleansing agent
(d) in alkaline batteries
Answer
Answer: b
24. Sodium hydroxide turns phenolphthalein solution
(a) pink
(b) yellow
(c) colourless
(d) orange
Answer
Answer: a
25. Chemical formula of washing soda is
(a) Na2C03 . 7H2O
(b) Na2C03 . 5H2O
(c) Na2C03 . 2H2O
(d) Na2C03 . 10H2O
Answer
Answer: d
Fill in the blanks
1. Acids turn …………. litmus solution…………. .
2. pH of basic solution is always …………. than 7.
3. …………. are the products obtained when bleaching powder reacts with dilute sulphuric acid.
4. Potassium nitrate has pH value equal to …………. .
5. …………. is the fixed number of water molecules chemically attached to each formula unit of a salt in its crystalline form.
6. …………. is one of the raw materials for the production of baking soda.
7. The salts of a strong acid and weak base are …………. with pH value …………. than 7.
8. Use of mild base like …………. on the bee-stung area gives relief.
9. During indigestion the stomach produces too much …………. and this causes pain and irritation.
10. The presence of …………. Ca in acids is responsible for their acidic properties.
11. Mixing an acid or base with water results in decrease in the concentration of per unit volume.
This process is called
12. Among HCl, H2SO4 and CH3COOH, …………. is a weak acid.
Answers
1. blue, red
2. more/greater
3. CaSO4, Cl2, H2O
4. 7 or seven
5. Water of crystallisation
6. Sodium chloride
7. acidic, less
8. baking soda
9. acid (HCl)
10. H+
11. OH– ions/H3O+ ions, dilution
12. CH3COOH
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