See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

    2 2 4 NiCl Ni Td   1 n 2      2 2 4 Ni CN Ni Sq. planar       2 n 0  .     2 2 2 6 Ni H O Ni Oh       3 n 2  Total number of unpaired electrons = n1 + n2 + n3 = 4