According to the valence bond theory the hybridization of central metal atom is dsp2 for which one of the following compounds?

Question

According to the valence bond theory the hybridization of central metal atom is dsp² for which one of the following compounds?

$NiC{l_2}.6{H_2}O$

${K_2}[Ni{(CN)_4}]$

$[Ni{(CO)_4}]$

$N{a_2}[NiC{l_4}]$

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