Identify the correct statements about the hydrides.
I. In saline hydrides oxidation state of hydrogen is +1 .
II. La H is an example of interstitial hydride.
III. $\mathrm{NH}_3, \mathrm{H}_2 \mathrm{O}$ have the tendency to form hydrogen bonds.
IV. Electrolysis of molten sodium hydride liberates $\mathrm{H}_2$ gas at cathode.
Assertion (A) Alkali metals and their salts impart characteristic flame colours.
Reason (R) Alkali metals have low ionisation enthalpy values. So, electron excitation is possible. The correct option among the following is
When compared with alkaline earth metals, the alkali metals have
Kernite and cryolite are the minerals of two elements $X$ and $Z$. Respectively $X$ and $Z$ are
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