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Q.

A bulb of unknown volume contained an ideal gas at 650mm pressure. A certain amount of the gas was withdrawn and found to occupy 1.5 c.c at 700mm pressure. The pressure of the gas remaining in the bulb was found to be 600mm.If all measurements are made at the same temperature, the volume of the bulb is

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a

21 c.c

b

42 c.c

c

105 c.c

d

63 c.c

answer is A.

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Detailed Solution

Let volume of the bulb be V mlApplying conservation of molesninitial  =  nwithdrawn  +  nRemaining 650 V760RT=700×1.5760RT+600 V760RT50V=70×15V=21ml
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A bulb of unknown volume contained an ideal gas at 650mm pressure. A certain amount of the gas was withdrawn and found to occupy 1.5 c.c at 700mm pressure. The pressure of the gas remaining in the bulb was found to be 600mm.If all measurements are made at the same temperature, the volume of the bulb is