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JEE Main levelSingle correct optionDifficulty 2 of 3ig130

Two bulbs X ( $1 L$ ) and Y ( $3 L$ ) are connected through a stopcock. X contains an ideal gas at $8 atm$ and Y is evacuated. On opening the stopcock at constant temperature, the final pressure is

A $2 atm$
B $8/3 atm$
C $4 atm$
D $6 atm$

Answer: A

Boyle's law for the fixed amount of gas:

8 \times 1 = P_{2} \times (1 + 3)

,

P_{2} = 2 atm

.

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