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

Which one of the following properties has the same value for $H_2$ and $D_2$?

Match List-$I$ with List-$II$.

List-$I$ (Hydrides)	List-$II$ (Nature)
$a. MgH_2$	$i. \text{Electron precise}$
$b. GeH_4$	$ii. \text{Electron deficient}$
$c. B_2H_6$	$iii. \text{Electron rich}$
$d. HF$	$iv. \text{Ionic}$

Choose the correct answer from the options given below:

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

What is obtained by the reaction of $HCOOH$ with concentrated $H_2SO_4$?

Which of the following sets are correctly matched?
$(i)$ $B_2H_6$ - electron deficient hydride
$(ii)$ $NH_3$ - electron precise hydride
$(iii)$ $H_2O$ - electron rich hydride