(C) Ionic hydrides,such as $LiH$ or $CaH_2$,contain the hydride ion $(H^-)$. In these compounds,the hydrogen atom is in the $-1$ oxidation state. Sinc

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(C) Ionic hydrides,such as $LiH$ or $CaH_2$,contain the hydride ion $(H^-)$. In these compounds,the hydrogen atom is in the $-1$ oxidation state. Since hydrogen can easily lose an electron to form $H_2$ gas,these compounds act as strong reducing agents.