Question

What is the oxidation state of coloured ion in $\left[Ni\right(H_{2}O{)}_4{]}^{2+}$ ?

Answer 1

The given complex is $\left[Ni\right(H_{2}O{)}_4{]}^{2+}$

Let oxidation state of $Ni$ be $x$

The charge of water is 0

By putting the values, we get-

$x+4\times 0=2$

$⟹x=+2$

So, the correct answer is 2