Question

Among NH₃, HNO₃, NaN₃ and Mg₃N₂ the number of molecules having nitrogen in negative oxidation state is
(a) 1
(b) 2
(c) 3
(d) 4

Answer 1

except hno3 all are negative oxidation state of nitroge in nh3 is -3, nan3 is -1/3 and in mg3n2 is -3 so (c) option

Answer 2

The number of molecules having negative oxidation state of nitrogen are 3

Explanation:

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

For the given chemical compounds:

Let the oxidation state of nitrogen be 'x'

• $NH_3$ compound:

Oxidation state of hydrogen = +1

So,

$x+(3\times (+1))=0\\\\x=-3$

Oxidation state of nitrogen = -3

• $HNO_3$ compound:

Oxidation state of hydrogen = +1

Oxidation state of oxygen = -2

So,

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

Oxidation state of nitrogen = +5

• $NaN_3$ compound:

Oxidation state of sodium = +1

So,

$+1+(3\times x)=0\\\\x=-\frac{1}{3}$

here, the nitrogen is present as azide ion $(N_3^-)$

Oxidation state of nitrogen = $\frac{-1}{3}$

• $Mg_3N_2$ compound:

Oxidation state of magnesium = +2

So,

$(3\times (+2))+(2\times x)=0\\\\x=\frac{-6}{2}=-3$

Oxidation state of nitrogen = -3

Learn more about oxidation state:

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