Melting of ice is an example of:
Exothermic reaction
Endothermic reaction
Chemical combination
Chemical decomposition
We keep food at low temperature in a refrigerator because it:
Saves money
Makes food more tastier
Kills bacteria present in the food
In fashionable to keep the food in the refrigerator
The growth of seedlings in a crop is a:
Undesirable change
Desirable change
Reversible change
Physical change
Which of the following is not a reversible change?
Heating of water to steam
Cooking of egg to scrambled eggs
Heating of wax to molten wax
Cooling a cake
The cells used in a wrist watch undergo:
Periodic change
Chemical change
None
Cooking of rice is an example of:
Irreversible change
Exothermic change
Reversible change.
Which of the following is a feature of physical change?
It is reversible
It is temporary
No new substance is formed
All of these
Identify the substance that evaporates at room temperature:
Water
Oil
Kerosene
Ammonium chloride
When nitrogen reacts with hydrogen under high temperature and pressure ammonia, which is also a gas is formed. This is an example of:
Oxidation
In an endothermic reaction:
Energy is released
Energy is absorbed
Energy is neither released nor absorbed
Energy is not required
