See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

Isomer of 4 2 CoSO Br.5H O are    4 2 5 A CoSO H O Br     and    2 4 5 B CoBr H O SO     Ion isomers A and B complex ions are     1 2 4 2 2 5 5 CuSO H O and CoBr H O           , so a = +1, b = +2 a + b = 3