CBSE Class 10 Science Acids Bases and Salts MCQs Set 08

Question. A compound is prepared from gypsum upon heating to a temperature of 373 K and it changes back to gypsum on adding water. Which is the incorrect statement about the compound?
(a) The compound is used for setting fractured bones.
(b) The compound is called plaster of Paris which is calcium sulphate dehydrate with a formula CaSO₄.2HO.
(c) If heated at higher temperature, the compound becomes dehydrated and is called dead burnt plaster.
(d) Both (a) and (b).
Answer: b

Question. Which of the following are present in a dilute aqueous solution of hydrochloric acid?
(a) H3O+ + Cl–
(b) H3O+ + OH–
(c) Cl– + OH–
(d) Unionized HCl
Answer: a

Question. Which of the following is acidic in nature?
(a) Lime juice
(b) Human blood
(c) Lime water
(d) Antacid
Answer: a

Question. Sodium carbonate is a basic salt because it is a salt of
(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: d

Question. Identify the basic salt from the following salts:
(a) Na₂CO₃
(b) NH₄Cl
(c) NaNO₃
(d) KCl 
Answer: a

Question. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is
(a) hydrochloric acid.
(b) tartaric acid.
(c) acetic acid.
(d) sulphuric acid.
Answer: b

Question. Which of the following is used for dissolution of gold?
(a) Hydrochloric acid
(b) Sulphuric acid
(c) Nitric acid
(d) Aqua regia
Answer: d

Question. Which one of the following can be used as an acid– base indicator by a visually impaired student?
(a) Litmus
(b) Turmeric
(c) Vanilla essence
(d) Petunia leaves
Answer: c

Question. A milk man adds a very small amount of baking soda to fresh milk. Why?
(a) To increase the rate of fermentation
(b) To decrease the rate of fermentation
(c) To increase its quality
(d) To make paneer
Answer: b

Question. Which of the following salts does not contain water of crystallisation?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum
Answer: b

Question. An aqueous solution ‘A’ phenolphthalein solution colour is pink. On addition of an aqueous solution ‘B’ to ‘A’, the pink colour disappears. The following statement is true for solution ‘A’ and ‘B’.
(a) A is strongly basic and B is a weak base.
(b) A is strongly acidic and B is a weak acid.
(c) A has pH greater than 7 and B has pH less than 7.
(d) A has pH less than 7 and B has pH greater than 7.
Answer: c

Question. Which of the following is not a salt?
(a) Sodium chloride
(b) Slaked lime
(c) Lead sulphide
(d) Zinc nitrate
Answer: b

Question. During the preparation of hydrogen chloride gas 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: c

Question. Which of the given substances is used in the following applications?
I. It is used as a fire proofing material.
II. It is used for sealing gaps in laboratory apparatus.
III. It is used in making toys.
(a) Bleaching powder
(b) Plaster of Paris
(c) Baking soda
(d) Washing soda
Answer: b

Question. What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) The temperature of the solution increases
(ii) The temperature of the solution decreases
(iii) The temperature of the solution remains the same
(iv) Salt formation takes place
(a) (i) only
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (iv)
Answer: d

Question. Common salt besides being used in kitchen can also be used as the raw material for making 
(i) washing soda. (ii) bleaching powder.
(iii) baking soda. (iv) slaked lime.
(a) (i) and (ii)
(b) (i), (ii) and (iv)
(c) (i) and (iii)
(d) (i), (iii) and (iv)
Answer: c

Assertion And Reason Based MCQs :

Directions : In the following questions, A statement of Assertion (a) is followed by a statement of Reason (R). Mark the correct choice as.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is NOT the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is True.

Question. Assertion (A): Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid.
Reason (R): Carbon dioxide is given off in the reaction.
Answer: a

Question. Assertion (A): When zinc is added to dilute hydrochloric acid, hydrogen is given off.
Reason (R): Hydrogen chloride molecules contain hydrochloric acid and hydrogen atoms.
Answer: b

Question. Assertion (A): Plaster of Paris is used by doctors for setting fractured bones.
Reason (R): When Plaster of Paris is mixed with water and applied around the fractured limbs, it sets into a hard mass.
Answer: a

Question. Assertion (A): When common salt is kept open, it absorbs moisture from the air.
Reason (R): Common salt contains magnesium chloride.

Question. Assertion (A): Baking soda creates acidity in the stomach.
Reason (R): Baking soda is alkaline.
Answer: d

Question. Assertion (A): After white washing the walls, a shiny white finish on walls is obtained after two to three days. 
Reason (R): Calcium Oxide reacts with Carbon dioxide to form Calcium Hydrogen Carbonate which gives shiny white finish.
Answer: c

Question. Assertion: Sodium hydrogen carbonate is an acidic salt.
Reason: It is a salt produced by the neutralization reaction between a strong base (NaOH) and a weak acid (H₂CO₃).
Answer: d

Question. Assertion (A): Ammonia solution is an alkali.
Reason (R): Ammonia solution turns blue litmus paper red.
Answer: c