Question

In which of the following compounds is the oxidation number of nitrogen different from the other three

Answer 1

Answer;

C. NH4CL

Explanation;

Oxidation number of an atom is the charge that atom would have if the compound was composed of ions.

The oxidation number of Nitrogen in;

NO3 is +5

N2O5 is +5

Ca(NO3)2 is +5

While the oxidation number of Nitrogen in NH4Cl is -3

Answer 2

Answer:

The correct answer is option C.

Explanation:

Oxidation number : The charge on the central atom calculated by assigning charges to other atoms or ligands and putting their sum equal to the overall charge on the ion or molecule or coordination sphere.

1) Oxidation state of nitrogen atom in $NO_3^-$ ion:

$x+3\times (-2)=-1$

x = 5

2) Oxidation state in $N_2O_5$

$2x+5\times (-2)=0$

x = +5

3) Oxidation state in $NH_4Cl$

$x+4\times (+1)+(-1)=0$

x = -3

4) Oxidation state in $Ca(NO_3)_2$

$+2+2x+6\times (-2)=0$

x = +5

Hence, the correct answer is option C.