Question

In: Chemistry

please match nitrogen from the phrase that best describes it: _Most abundant form of nitrogen _disrupts...

please match nitrogen from the phrase that best describes it:

_Most abundant form of nitrogen

_disrupts 03-o2 equilibrium and is a greenhouse gas

_most oxidized form of nitrogen

1. NO

2. N2

3. N2O

4.NO3

5.HNO2

Solutions

Expert Solution

Ans. 1. Most abundant form of Nitrogen is N2 N2 constitutes around 78% of the atmospheric gases.

Ans. 2. Nitrous oxide (N2O) is a greenhouse gas. Rest of the gases listed here are not greenhouse gas.

N2O exhibits photolysis in presence of UV rays in stratosphere as follows-

            N2O ------UV (hv)---------> NO + O

Nascent oxygen (O) further reacts with nitrous oxide to produce nitric oxide as follows-

            N2O + O -------------> 2 ­NO

The product, nitric oxide (NO) further reacts with ozone (O3) to produce nitrogen dioxide (NO2) which further reacts ozone.

            NO + O3 -------> NO2 + O2

            NO2 + O3 --------> NO3 + O2

Through this chain reaction, nitrous oxide (N2O) disrupts the ozone layer (O3- O2 equilibrium in the ozone layer).   

Ans. 3. NO – Oxidation number of N-atom = +2

N2 – Oxidation number of N-atom = 0

N2O – Oxidation number of N-atom = +1

NO3- – Oxidation number of N-atom = +5

HNO2 – Oxidation number of N-atom = +3

Thus, NO3- is the most oxidized from of nitrogen because of having highest oxidation number.


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