In an ice crystal,each water molecule is hydrogen bonded to $.......$ neighbouring molecules.

Number of neutrons in a heavy hydrogen atom is

In which of the following reactions, hydrogen is evolved?
$I$. Reaction of sodium borohydride with iodine
$II$. Oxidation of diborane
$III$. Reaction of boron trifluoride with sodium hydride
$IV$. Hydrolysis of diborane

The reaction of diborane in diethylether with $\underline{X}$ gives metal borohydride. $X$ is a

Complete the reaction: $8LiH + Al_2Cl_6 \to ?$

Give the chemical reactions for the preparation of water gas and producer gas.