When iron nail dipped in $CuS{O}_{4}CuSO\_4$ the nail becomes brown due to

The reagent used to remove the colour of the matter is called

The number of molecules present in 1g of hydrogen

Heating of which of the following compounds gives acidic and basic oxide?

Choose double displacement reaction ………………….

In which of the following, heat energy will be evolved?

The chemical formula of ferric oxide is ……………….

Chemical reactions which occur in presence of sunlight are called ……………. reactions.

Which of the following is not a balanced equation?

In which of the following reactions is there only one reactant?