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(C) Statement $I$ is correct: $LiH, BeH_2$,and $MgH_2$ are saline (ionic) hydrides that exhibit significant covalent character due to the small size a

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$I, IV$ only

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(C) Statement $I$ is correct: $LiH, BeH_2$,and $MgH_2$ are saline (ionic) hydrides that exhibit significant covalent character due to the small size and high polarizing power of the cations.Statement $II$ is incorrect: Saline hydrides are non-volatile,high-melting crystalline solids due to strong electrostatic forces of attraction between ions.Statement $III$ is incorrect: Electron-precise hydrides (e.g.,$CH_4, SiH_4$) have the required number of electrons to form normal covalent bonds and do not act as Lewis bases.Statement $IV$ is correct: Chromium forms a non-stoichiometric interstitial hydride with the formula $CrH$ (or $CrH_{1.7}$ depending on conditions).Therefore,statements $I$ and $IV$ are correct.

Column $-A$	Column $-B$
$(1)$. $VH$	$(a)$. Ionic hydride
$(2)$. $HF$	$(b)$. Metallic hydride
$(3)$. $MgH_2$	$(c)$. Electron precise hydride
$(4)$. $B_2H_6$	$(d)$. Molecular hydride

Among the following,the correct statements are:
$I$. $LiH, BeH_2$ and $MgH_2$ are saline hydrides with significant covalent character.
$II$. Saline hydrides are volatile.
$III$. Electron-precise hydrides are Lewis bases.
$IV$. The formula for chromium hydride is $CrH$.
The correct option is:

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Match the correct option from Column $-A$ and Column $-B$.

Column $-A$ Column $-B$

$(1)$. $VH$ $(a)$. Ionic hydride

$(2)$. $HF$ $(b)$. Metallic hydride

$(3)$. $MgH_2$ $(c)$. Electron precise hydride

$(4)$. $B_2H_6$ $(d)$. Molecular hydride

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Among the following,the correct statements are:$I$. $LiH, BeH_2$ and $MgH_2$ are saline hydrides with significant covalent character.$II$. Saline hydrides are volatile.$III$. Electron-precise hydrides are Lewis bases.$IV$. The formula for chromium hydride is $CrH$.The correct option is: