The three elements $X$,$Y$ and $Z$ with electronic configurations shown below all form hydrides:

Element	Electronic configuration
$X$	$1s^2, 2s^2, 2p^2$
$Y$	$1s^2, 2s^2, 2p^6, 3s^1$
$Z$	$1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10}, 4s^2, 4p^5$

Which set of properties match correctly with properties of the hydrides of these elements?

• A
  $A$. Hydride of $X$ is a colourless gas insoluble in $H_2O$; Hydride of $Y$ is a silver/grey solid that reacts with $H_2O$ to form an alkali; Hydride of $Z$ is a colourless gas that forms a strong acid in $H_2O$.
• B
  $B$. Hydride of $X$ is a colourless liquid,no reaction with $H_2O$; Hydride of $Y$ is a silver/grey solid that forms $H_2$ and $H_2O$; Hydride of $Z$ is an ionic solid with formula $ZH$.
• C
  $C$. Hydride of $X$ is a non-polar compound that reacts with $Cl_2$ in light; Hydride of $Y$ is a silver/grey ionic solid with formula $YH_2$; Hydride of $Z$ forms when water is added to phosphorus and elemental $Z$.
• D
  $D$. Hydride of $X$ is a colourless gas which burns in air; Hydride of $Y$ is a silver/grey solid which reacts violently with acids; Hydride of $Z$ is a colourless,corrosive liquid at $STP$.