Phy and Chem MCQs PT2

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

• Baking powder

• Lime

• Ammonium hydroxide solution

• Hydrochloric acid

Sodium carbonate is a basic salt because it is a salt of:-

• strong acid and strong base

• weak acid and weak base

• strong acid and weak base

• weak acid and strong base

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:-

• 1:1

• 2:1

• 4:1

• 1:2

Which of the following is an example of simple displacement reaction:-

• The electrolysis of water

• The burning of methane

• The reaction of a metal with an acid

• The reaction of two solutions to form precipitate

When a small amount of acid is added to water, the phenomena which occur are:-

A. Dilution

B.Neutralization

C. Formation of H₃O⁺ ions

D. Salt formation

• Both A and B

• Both A and C

• Only B

• Only D

Which of the following salts do not have the water of crystallization?

A. Bleaching powder

B. Plaster of paris

C. Washing soda

D. Baking soda

• Both A and C

• Only D

• Both A and D

• Only A

In an aqueous solution 'A', Phenolphthalein solution color is pink. On addition of an aqueous solution 'B' to 'A', the pink color disappears. Which of the following statement is true for solution 'A' and 'B'.

• A is strongly basic and B is a weak base

• A is strongly acidic and B is a weak acid

• A has pH greater than 7 and B has pH less than 7

• A has pH less than 7 and B has pH greater than 7

Which of the following statements is true?

• A convex lens has 4 dioptre power having a focal length 0.25 m

• A convex lens has -4 dioptre power having a focal length 0.25 m

• A concave lens has 4 dioptre power having a focal length 0.25 m

• A concave lens has -4 dioptre power having a focal length 0.25 m

The Change in focal length of an eye lens is caused by the action of the:

• Pupil

• Retina

• Ciliary muscles

• Iris

Assertion : HCl is a stronger acid than acetic acid.

Reason: On dissociation, HCl yields lesser hydrogen ions for the same concentration as compared to acetic acid.

• Both A and R are correct. And R is the correct explaination of A

• Both A and R are correct but R is not the correct explaination of A

• A is true but R is false

• A is false but R is true