Chemistry-Physical and Chemical Changes (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 1 - 3 of 26

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Question number: 1

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

MCQ▾

Question

A silvery white metal X reacts with water at room temperature to produce a water soluble compound Y and a colorless gas Z. The reactions are highly exothermic and the Z catches fire immediately during the reaction. The solution of Y in water on reacting with stoichiometric amount of dilute solution of hydrochloric acid gives a solution of pH = 7.0 the compounds X, Y and Z respectively are

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 2

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

Assertion-Reason▾

Assertion (Ꭺ)

Reactivity of aluminum decreases when it is dipped in nitric acid.

Reason (Ꭱ)

a protective layer of aluminum nitrate is formed when aluminum is dipped in nitric acid.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true

Question number: 3

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

MCQ▾

Question

A drop each of two non-corrosive and non-irritating liquids A and B at a temperature of 22°C are placed on the skin. Liquid A gives a more cooling sensation than liquid B. Which of the following can be said about the liquids A and B?

Choices

Choice (4) Response

a.

Liquid A has higher latent heat of vapourisation than that of liquid B

b.

Liquid A has lower latent heat of vapourisation than that of liquid B

c.

Liquid A has higher boiling point than that of liquid B

d.

The boiling points of liquid A and B are equal

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