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(D) $NH_3$ is an electron-rich hydride because the $N$-atom belongs to group $15$ and uses three of its valence electrons to form three $N-H$ bonds,wh

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electron rich hydride - $NH_3$

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(D) $NH_3$ is an electron-rich hydride because the $N$-atom belongs to group $15$ and uses three of its valence electrons to form three $N-H$ bonds,while the remaining two electrons form a lone pair.$SiH_4$ is an electron-precise hydride.$CrH$ is a metallic (interstitial) hydride.$HF$ is an electron-rich hydride due to the presence of lone pairs on the $F$-atom.

Among the following,the correctly matched pair is

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