The incorrect statement among the following i | vedclass

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(C) $1$. Ionic (or saline) hydrides are stoichiometric compounds formed by $s$-block elements. They are crystalline,non-volatile,and non-conducting so

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Covalent hydrides are non-volatile compounds.

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(C) $1$. Ionic (or saline) hydrides are stoichiometric compounds formed by $s$-block elements. They are crystalline,non-volatile,and non-conducting solids in their solid state. They react violently with water to produce $H_2$ gas.$2$. Group $14$ elements (like $CH_4$,$SiH_4$) have the required number of electrons to form normal covalent bonds,hence they are called electron-precise hydrides.$3$. Covalent (or molecular) hydrides are generally volatile compounds with low boiling points and melting points,as they are held together by weak van der Waals forces. Therefore,the statement that covalent hydrides are non-volatile is incorrect.

List-$I$ (Fuels)	List-$II$ (Composition)
$A$. Water gas	$i$. $A$ mixture of $CO$ and $N_2$
$B$. Producer gas	$ii$. Methane
$C$. Coal gas	$iii$. $A$ mixture of $CO$ and $H_2$
$D$. Natural gas	$iv$. $A$ mixture of $CO$,$H_2$,$CH_4$ and $CO_2$

The incorrect statement among the following is:

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