Question

A gas bulb is filled with NO2 gas and immersed
in an ice bath at 0°C which becomes colourless
after sometime. This colourless gas will be
a) NO,
b) NO
NO
d) NO.

Answer 1

Explanation:

How can I answer the answers all that are given above are same

Answer 2

Answer:

the colorless gas formed when a bulb filled with NO₂ is immersed in an ice bath at 0° C is N₂O₄.

Explanation:

According to Le Chatelier’s Principle, inside the bulb we have NO2 and N2O4 gases at equilibrium.

Cooling or heating the contents of the bulb shifts the equilibrium.

That is, equilibrium shifts when temperature changes inside the bulb.

Dimerization of NO2 to N2O4 as shown below is an exothermic reaction.

2 NO₂ ⇄ N₂O₄

Increasing the temperature shifts the equilibrium to the left thus increasing the concentration of NO₂, while cooling the system shifts the equilibrium to the right increasing the concentration of N₂O₄ which is colorless.

Therefore, the colorless gas will be N₂O₄.