HARD
7th CBSE
IMPORTANT
Earn 100

Select the odd one out.

Sublimation, Ammonium chloride, Sublimate, Evaporation, Melting of a solid.

52% studentsanswered this correctly

Important Questions on Physical and Chemical Changes

HARD
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 4
Pick the odd one out from the following:
Magnesium ribbon, Dazzling light, Chemical change, Exothermic reaction, Crystallisation.
MEDIUM
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 5
Pick the odd one out from the following:
Iron, Moist air, Brown powdery substance, Galvanization, Lustrous.
MEDIUM
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 1

Define the Following Terms:

Reversible and Irreversible changes     

EASY
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 2

Define the following term:

Physical change 

EASY
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 3

Define the following term:

Chemical change

EASY
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 4

Define the following term.

Rusting of iron 

MEDIUM
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 5

Define the following term:

Crystallisation

HARD
7th CBSE
IMPORTANT
Science 7>Chapter 6 - Physical and Chemical Changes>Summative ASSESSMENT>Q 1
A bottle containing a perfume is by mistake left open. After a few days, its volume was found to have reduced to half. Explain giving reason.