Chemistry (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 7 - 10 of 63

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Question number: 7

» 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: 8

» Chemistry » Acid Bases and Salt

Appeared in Year: 2013

MCQ▾

Question

A salt can be produced by which reaction

  1. a weak acid and weak base
  2. metal oxide and water
  3. metal and a mineral acid
  4. metal oxide and a mineral acid

Choices

Choice (4) Response

a.

2, 3, 4

b.

4, 1, 2

c.

1, 2, 3

d.

3, 4, 1

Question number: 9

» Chemistry » Carbon and Its Compounds

Appeared in Year: 2013

MCQ▾

Question

Which of the following pairs of compounds of carbon will undergo combustion as well as addition reactions?

Choices

Choice (4) Response

a.

CH4andC2H6

b.

C2H2andC3H6

c.

C2H4OandC3H6O

d.

C2H6OandC3H8O

Question number: 10

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

A metal carbonate X on treatment with a mineral acid liberates a gas, which when passed through aqueous solution of a substance Y gives back X. The substances Y on reaction with the gas obtained at anode during electrolysis of brine gives a compound Z which can decolorize colored fabrics. The compounds X, Y and Z respectively are

Choices

Choice (4) Response

a.

CaCO3,Ca(OH)2,CaOCl2

b.

Ca(OH)2,CaCO3,CaOCl2

c.

CaCO3,CaOCl2,Ca(OH)2

d.

Ca(OH)2,CaO,CaOCl2

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