Entry Test MCQ :: Gases

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Hydrogen effuses four times more rapidly than volume of an unknown gas molar mass of unknown gas should be

[A].	16 gmol-1	[B].	32 gmol-1
[C].	48 gmol-1	[D].	64 gmol-1

Answer: Option B

Muhammad Amad said:

plzzz sir explain this question ?? that how answer is 32

Rabia malik said:

FORMULA IS rA/rB=under root mB/mA now put the values rH2/rB=UNDER ROOT mB/2(2 IS THE MOLECULAR FORMULA OF H2)NOE TAKING SQUARE ROOT ON BOTH SIDES AND UNDER ROOT WILL BE CANCLE BY SQUARE ROOT AND 4 WILL BE 16 BY SQUARING THEN MULTIPLY 2 BY 16 ANS IS 32