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(D) Statement $(i)$: $NaH_{(s)} + H_2O_{(l)} \rightarrow NaOH_{(aq)} + H_{2(g)}$. This reaction is highly exothermic and violent. Thus,statement $(i)$

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$(i)$,$(ii)$

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(D) Statement $(i)$: $NaH_{(s)} + H_2O_{(l)} \rightarrow NaOH_{(aq)} + H_{2(g)}$. This reaction is highly exothermic and violent. Thus,statement $(i)$ is correct.Statement $(ii)$: $NH_3$ has a lone pair of electrons on the $N$ atom,making it an electron-rich hydride. Thus,statement $(ii)$ is correct.Statement $(iii)$: Saline (or ionic) hydrides are formed by $s$-block elements. Nickel $(Ni)$ is a $d$-block element and forms metallic (or interstitial) hydrides,not saline hydrides. Thus,statement $(iii)$ is incorrect.Therefore,statements $(i)$ and $(ii)$ are correct.

Which of the following statements are correct?
$(i)$ $NaH_{(s)}$ reacts violently with water to form $NaOH$ and $H_2$
$(ii)$ An example for electron rich hydride is $NH_3$
$(iii)$ Nickel forms saline hydride

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Which of the following statements are correct?$(i)$ $NaH_{(s)}$ reacts violently with water to form $NaOH$ and $H_2$$(ii)$ An example for electron rich hydride is $NH_3$$(iii)$ Nickel forms saline hydride