Question

When zinc reacts with very dilute HNO3 the oxidation state of nitrogen changes from a) +5 to +1
B) +5 to -3
c) +5 to +4
D) +5 to +3

Answer 1

The oxidation state of nitrogen changes from +5 to +1

Explanation:

Oxidation state is the number that is given to an atom, when it looses or gains electron. It is written as a superscript.

A positive oxidation state is obtained when an atom looses electrons and a negative oxidation state is obtained when an atom gains electrons.

When zinc reacts with very dilute nitric acid, it leads to the formation of a salt, a gas (commonly known as laughing gas) and water.

The chemical equation for the reaction of zinc metal and very dilute nitric acid follows:

$4Zn+10HNO_3\rightarrow 4Zn(NO_3)_2+N_2O+5H_2O$

We know that:

Oxidation state of oxygen = -2

Oxidation state of hydrogen = +1

Oxidation state of nitrogen in $HNO_3$ :

$\Rightarrow +1+x+3(-2)=0\\\\\Rightarrow x=+5$

Oxidation state of nitrogen in $N_2O$ :

$\Rightarrow 2x-2=0\\\\\Rightarrow x=+1$

Learn more about oxidation states:

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