Chemistry (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 22 - 29 of 142

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Question number: 22

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

The correct formula of rust is

Choices

Choice (4) Response

a.

Fe 3 O 4

b.

Fe 2 O 3. xH 2 O

c.

Fe 2 O 3

d.

Fe 3 O 4. xH 2 O

Question number: 23

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

lowering the temperature

Choices

Choice (4) Response

a.

lowering the temperature

b.

increasing the pressure and lowering the temperature

c.

increasing the pressure

d.

increasing the temperature

Question number: 24

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

The latent heat of vaporization of water is

Choices

Choice (4) Response

a.

3.34 × 10 5 Jkg

b.

22.5 × 10 5 Jkg

c.

2.2 × 10 5 Jkg

d.

None of the above

Question number: 25

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Evaporation of liquid occur at

Choices

Choice (4) Response

a.

all temperature

b.

boiling point

c.

fixed temperature lower than the boiling point

d.

All of the above

Question number: 26

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

An element is determined by the number of

Choices

Choice (4) Response

a.

atoms

b.

electrons

c.

neutrons

d.

protons

Question number: 27

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

The physical state of water at 100°C is

Choices

Choice (4) Response

a.

Plasma

b.

Gas

c.

Solid

d.

Liquid

Question number: 28

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Which of the following is not a chemical reaction?

Choices

Choice (4) Response

a.

Rusting of iron

b.

Digestion of food in our body

c.

Dissolution of sugar in water

d.

Souring of milk

Question number: 29

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

The term rancidity represents

Choices

Choice (4) Response

a.

oxidation of fatty food

b.

acid rain

c.

rattening of fruit

d.

fading of colored clothes in the Sun

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