Chemistry-Physical and Chemical Changes (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 18 - 22 of 26

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Question number: 18

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Which of the following are responsible for causing acid rain?

Choices

Choice (4) Response

a.

Oxides of Sulphur and nitrogen

b.

Oxides of nitrogen and carbon monoxide

c.

Oxides of Sulphur and carbon dioxide

d.

Hydrogen sulphide and carbon dioxide

Question number: 19

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Which of the following is a chemical change?

Choices

Choice (4) Response

a.

Burning of magnesium in air

b.

Blowing of wind

c.

Dissolution of sugar in water

d.

Melting of ice

Question number: 20

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Beakers A, B and C contain zinc sulphate, silver nitrate and iron (II) sulphate solutions, respectively. Copper pieces are added to each beaker. Blue colour will appear to in case of

Choices

Choice (4) Response

a.

beaker B

b.

beaker C

c.

beaker A

d.

Question does not provide sufficient data or is vague

Question number: 21

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Washing soda (Na2CO3.10H2O) on exposure to air gives

Choices

Choice (4) Response

a.

Na2CO3.H2O

b.

Na2CO3.9H2O

c.

Na2CO3.7H2O

d.

Na2CO3.5H2O

Question number: 22

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

A highly reactive element X is stored under water. It readily reacts with oxygen of air to give a compound Y, which dissolves in water. The aqueous solution of Y changes blue litmus solution to red. The element X is

Choices

Choice (4) Response

a.

Phosphorous

b.

Sulphur

c.

Potassium

d.

Sodium

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