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Q.
The density of nitrogen is maximum at
States of Matter
Solution:
Density $= \frac{\text{Mass}}{\text{Volume}}$
For density to be maximum, volume should be minimum (mass being a constant quantity).
We know, $V\propto T$ and $V \propto \frac{1}{P}$
So, at high pressure and low temperature, volume will be minimum and density will be maximum.