A) are definitely monoatomic
B) are definitely rigid diatomic
C) are definitely non-rigid diatomic
D) can be monoatomic or rigid diatomic
Correct Answer: D
Solution :
A monoatomic gas has 3 degrees of freedom an diatomic gas has 5 degrees of freedom. For monoatomic gas, \[{{\text{N}}_{\text{2}}}{{\text{O}}_{\text{5}}}\] and \[\text{2}.\text{4 }\times \text{l}{{0}^{-\text{4}}}\] For a diatomic gas, \[\text{mol }{{\text{L}}^{\text{-1}}}\] and \[\text{mi}{{\text{n}}^{\text{-1}}}\] \[{{N}_{2}}{{O}_{5}}\xrightarrow{{}}2N{{O}_{2}}+\frac{1}{2}{{O}_{2}}\] Hence, we can conclude that the molecules of the gas can be monoatomic or rigid diatomic. Stress
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