# With respect to the following reaction, which is the correct statement? 2HNO_3(aq) + 3H_2S(aq) rarr 3S(s)+2NO(g) +4H_2O; a. both sulfur and nitrogen are reduced; b. nitrogen is reduced and sulfur is oxidized; c. oxygen is oxidized; d. this is not redox.

Sep 1, 2016

$b .$

#### Explanation:

$2 H N {O}_{3} + 3 {H}_{2} S \rightarrow 3 S \downarrow + 2 N O \uparrow + 4 {H}_{2} O$

Can you write the redox half equations?

Nitrate ion, $N \left(+ V\right)$, is reduced to nitrous oxide, $N \left(+ I I\right)$.

$H N {O}_{3} + 3 {H}^{+} + 3 {e}^{-} \rightarrow N O + 2 {H}_{2} O$

Try to represent the sulfur oxidation.

This is (I take it) a first year chemistry problem? Surely it's at least A level?