The product obtained when the water is treated with carbon dioxide is
Carbon monoxide
Carbonic acid (hydrogen carbonate)
Acetic acid
Lactic acid
A chemical reaction in which two or more substances combine to form a new substance is known as a
Combination reaction
Double decomposition
Displacement reaction
Decomposition reaction
Water changes into ice is called
Freezing
Condensing
Physical change
Chemical change
The reaction between hydrogen and chlorine to form
Hydrogen peroxide
Water
Hydrogen chloride
Ammonia
What is the chemical reaction in which a substance break up on heating to form two or more simpler substances, which can be either elements or compounds?
For a balanced equation the sign can be replaced by the = sign is
+ ve sign
- ve sign
# sign
→ sign
Iron and sulphur have combined to form a compound called
Iron oxide
Iron sulphide
Iron peroxide
Iron sulphate
The heating of an electric iron is
Permanent change
Temporary change
Of these which one can neither be created nor be destroyed?
Light
Heat
Change
Matter