When electric current is supplied through an ionic hydride in its fused state,then:

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$
Assertion $(A):$ Heavy water is used for the study of reaction mechanism.
Reason $(R):$ The rate of reaction for the cleavage of $O-H$ bond is slower than that of $O-D$ bond.
Choose the most appropriate answer from the options given below:

Match the following:

List-$I$	List-$II$
$A$. Electron-deficient hydride	$I$. $CH_4$
$B$. Electron-precise hydride	$II$. $B_2H_6$
$C$. Electron-rich hydride	$III$. $CaH_2$
$D$. Saline hydride	$IV$. $NiH_{0.6}$
	$V$. $PH_3$

When electric current is passed through an ionic hydride in the molten state,

Hydrogen can be obtained from water by

In the water-gas shift reaction,hydrogen gas is produced from the reaction of steam with