Physical and Chemical Changes-Chemical Changes (CBSE Class-7 Science): Questions 1 - 6 of 6

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Question number: 1

» Physical and Chemical Changes » Chemical Changes » Chemical Reactions and Its Examples

MCQ▾

Question

Chemical reactions taking place in a chemical changes are:

Choices

Choice (4) Response

a.

Double displacement reactions

AND

Decomposition reactions

b.

Direct combination or synthesis reaction

c.

Displacement reactions

d.

All a. , b. and c. are correct

Question number: 2

» Physical and Chemical Changes » Chemical Changes » Chemical Reactions and Its Examples

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Exothermic reaction

b.

Explosion

c.

Endothermic reaction

d.

Question does not provide sufficient data or is vague

Question number: 3

» Physical and Chemical Changes » Chemical Changes » Chemical Reactions and Its Examples

MCQ▾

Question

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

Choices

Choice (4) Response

a.

A change in smell and colour may takes place

AND

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

b.

A gas is formed

c.

Sound may be produced

d.

All a. , b. and c. are correct

Question number: 4

» Physical and Chemical Changes » Chemical Changes » Chemical Reactions and Its Examples

MCQ▾

Question

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

Question number: 5

» Physical and Chemical Changes » Chemical Changes » Rusting

MCQ▾

Question

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.

None of the above

Question number: 6

» Physical and Chemical Changes » Chemical Changes » Chemical Reactions and Its Examples

MCQ▾

Question

Chemical changes are:

Choices

Choice (4) Response

a.

Involves a chemical reaction

b.

Changes in which one or more new substances are formed

c.

Irreversible

d.

All a. , b. and c. are correct

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