Melting of wax is a
Chemical change
Physical change
Colour change
Energy change
Respiration of living beings is
Transparent change
Time interval change
The heating of an electric iron is
Permanent change
Temporary change
Iron and sulphur have combined to form a compound called
Iron oxide
Iron sulphide
Iron peroxide
Iron sulphate
Magnesium burns in oxygen to give
Magnesium dioxide
Magnesium oxide
Magnesium chloride
Magnesium sulphate
Of these which one can neither be created nor be destroyed?
Light
Heat
Change
Matter
In a chemical equation, the number of the atoms of the reactants equal to the number of the atoms of the
Catalyst
Product
Energy
For a balanced equation the sign can be replaced by the = sign is
+ ve sign
- ve sign
# sign
→ sign
Which is the chemical reaction in which a more reactive element displaces a less reactive element from its compound?
Displacement reaction
Decomposition reaction
Double decomposition reaction
Combination reaction
A temporary change in which no new substance is formed is called
Chemical reaction
