Chemistry-Physical and Chemical Changes (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 4 - 6 of 26

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Question number: 4

» 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: 5

» 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

Question number: 6

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

MCQ▾

Question

An element X combines with hydrogen to form a compound XH3 . The element X is placed on the right side of the periodic table. What is true about the element X?

I. Has valence electrons.

II. Is a metal and is solid.

III. Is a non-mental and is a gas.

IV. Has a 5 valence electrons E. XH3 reacts with water to form a basic compound.

Choices

Choice (4) Response

a.

I, II and III

b.

V, I and II

c.

III, IV and V

d.

II, III and IV

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