Physical And Chemical Changes

Chemistry
497 Views

Identify the chemical changes in the list:
(i) Ripening of fruits
(ii) Fermentation of grapes
(iii) Magnetization of iron

A
Only (i) and (ii)
B
Only (ii) and (iii)
C
Only (i) and (iii)
D
(i), (ii) and (iii)
Hard
View solution>

Chemical change involves:

A
No change in weight of the reacting substance and the product formed.
B
Change in the composition.
C
Absorption (or) the release of energy.
D
Formation of precipitate.
Hard
View solution>

Why is zinc better than tin if we want to protect a piece of iron from rusting by electroplating?

A
Zinc is cheaper than tin.
B
Tin is toxic.
C
Rusting is prevented even when the zinc layer is broken.
D
None of these
Hard
View solution>

Rust is a mixture of

A
and
B
and
C
and
D
and
Hard
View solution>

Which of the following statements is true? 

A
Setting of milk to form curd is a chemical and reversible change.
B
Spoiling of food is a chemical and irreversible change.
C
Burning paper is a physical and reversible change.
D
Boiling of an egg is a physical and reversible change.
Hard
View solution>

Which of the following is a chemical change?

A
Burning of coal
B
Dissolving sugar in water
C
Dissolving salt in water
D
Melting of ice
Hard
View solution>

Digestion of food is which type of change?

A
Chemical
B
Physical
C
Irreversible
D
Reversible 
Hard
View solution>

Spoiling of food is _______ change.

A
Chemical
B
Physical
C
Reversible 
D
Irreversible 
Hard
View solution>