First slide

Gaseous state

Question

See the figure
The valves of X and Y are opened simultaneously. The white fumes of NH₄CI will first form at

Moderate

A

A
B

B
C

C
D

A, B and C simultaneously

Solution

Rate of diffusion of NH₃ (molar mass = 17) is larger than that of HCI (molar mass of HCI = 36.5), hence NH₃ covers more distance than HCI. NH₃ and HCI react to form white fumes of NH₄CI.

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