Question

Calculate the oxidation number of underlined elements in the following compounds:
$\left[\underset{--}{Fe}\right(N{O}^{+}\left)\right(H_{2}O{)}_5]S{O}_4$

• A. +2
• B. +3
• C. +1
• D. -1

Answer 1

The correct option is C +1

Let oxidation number of Fe be 'x' in $\left[Fe\right(N{O}^{+}\left)\right(H_{2}O{)}_5]S{O}_4$
$\text{charge on}N{O}^{+}=+1$
$\text{charge on}{H}_{2}O=0$
Charge on coordination sphere = +2
$\Rightarrow x+1+0=+2$
$\Rightarrow x=+1$