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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.

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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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: