Water does not produce $CO$ on reacting with:

The temporary hardness of water is due to

The products formed when heavy water is reacted with magnesium nitride are:

Identify the reactions in which $H_2O$ is oxidised:
$I$. Photosynthesis
$II$. Reaction of $H_2O$ with fluorine
$III$. Reaction of $H_2O$ with hydrogen
$IV$. Reaction of $H_2O$ with $P_4O_{10}$
The correct answer is

At atmospheric pressure and very low temperature,water crystallises to

On strong heating,$ZnCl_2 \cdot 2H_2O$ gives .......