Two closed bulbs of equal volume (V) containing an ideal gas initially at pressure p_i and temperature T₁ are connected through a narrow tube of negligible volume as shown in the figure below. The temperature of one of the bulbs is then raised to T₂. The final pressure p_f is:

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• 
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B.

Initially,
Number of moles of gases in each container = 
Total number of moles of gases in both containers
= 
After mixing, number of moles in left chamber
= 
Number of moles in right chamber = 
Total number of moles
=   
As the total number of moles remains constant. 
Hence,