NCERT Class 7 Science-Physical and Chemical Changes[Chemical Changes] [NCERT Based General Studies (GS)]: Questions 1 - 5 of 6

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Question 1

Question MCQ▾

Chemical reactions taking place in a chemical changes are:

Choices

Choice (4)Response

a.

Direct combination or synthesis reaction

b.

Decomposition reactions

AND

Double displacement reactions

c.

Displacement reactions

d.

All b., a. and c. are correct

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Question 2

Question MCQ▾

Chemical reaction involves the gain or loss of energy is called as:

Choices

Choice (4)Response

a.

Endothermic reaction

b.

Exothermic reaction

c.

Explosion

d.

None of the above

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Question 3

Question MCQ▾

During a chemical change in addition to products following may be:

Choices

Choice (4)Response

a.

A gas is formed

AND

A change in smell and colour may takes place

b.

Sound may be produced

c.

Heat, light or any other radiation may be given off or absorbed

d.

All a., b. and c. are correct

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Question 4

Question MCQ▾

Why cut fruits or vegetables turns drown when exposed to air:

Choices

Choice (4)Response

a.

Due to release of phenolic compounds

b.

Due to release of enzymes

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

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Question 5

Question MCQ▾

The process of slowly eating away of a metal on exposure to air and moisture is called as:

Choices

Choice (4)Response

a.

Rusting

b.

Rust

c.

Crystallization

d.

All of the above

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