Melting of wax is a
Chemical change
Physical change
Colour change
Energy change
The product obtained when the water is treated with carbon dioxide is
Carbon monoxide
Carbonic acid (hydrogen carbonate)
Acetic acid
Lactic acid
A reddish brown metal is
Platinum
Gold
Copper
Silver
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
Which is the chemical reaction in which a more reactive element displaces a less reactive element from its compound?
Double decomposition reaction
The heating of an electric iron is
Permanent change
Temporary change
The new substance which obtained by any chemical reaction is known as
Reactant
Catalyst
Product
Pure substance
The reaction between hydrogen and chlorine to form
Hydrogen peroxide
Water
Hydrogen chloride
Ammonia
For a balanced equation the sign can be replaced by the = sign is
+ ve sign
- ve sign
# sign
→ sign
