When sugar is brought into contact with concentrated $H_2SO_4$,it turns black due to .......

Give uses of Dihydrogen as a fuel.

The single largest industrial application of dihydrogen is:

State True or False for the following statements:
$1$. Metals of group $7$,$8$ and $9$ form non-stoichiometric hydrides.
$2$. Pure dihydrogen is obtained by heating hydrocarbons with $H_2O$ vapour in the presence of a $Ni$ catalyst at $1270 \ K$.
$3$. The ionization enthalpy of hydrogen is higher than that of alkali metals.
$4$. Some chemical properties of hydrogen resemble both metals and non-metals.

Which of the following facts are the evidence for the ionic nature of $LiH$?

Which of the following cannot be reduced by hydrogen?