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Q.

Two bulbs of volumes 200 cm3 and 100 cm3 are connected by a short tube containing an insulating porous plug that permits equalization of pressure but not of temperature between the bulbs. The system is sealed at 77° C when it contains oxygen under a pressure of 1 bar. The small bulb is immersed at 27° C and the large bulb is placed at 127° C.

Neglecting thermal expansion of the bulbs, select the correct options.

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a

Final pressure inside the system would b greater than 1 bar

b

Final pressure inside the system would be less than 1 bar

c

Number of moles of O2 would increase in small container compared to initial

d

Number of moles of O2 would increase in big container compared to initial

answer is A, C.

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Detailed Solution

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Since, total moles of O2 are conserved, we get, 

1×300350=P×100300+p×200400 P=300×6350×5=1.03bar

Also, since T, in small container, so, number of moles will increase while T in big container, so, number of moles will decrease in it.

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