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20 mL of methane is completely burnt usi...

20 mL of methane is completely burnt using 50 mL of oxygen. The volume of the gas left after cooling to room temperature is

A

80 mL

B

40 mL

C

60 mL

D

30 mL

Text Solution

Verified by Experts

The correct Answer is:
D
`underset(20mL)underset(1vol)(CH_(4))+underset(40mL)underset(2vol)(2O_(2))tounderset(20mL)underset(1vol)(CO_(2))+2H_(2)O`
Volume of oxygen left unused = 50-40=
10 mL on cooling water vapour changes into liquid volume of gases after cooling = 10 mL
`CO_(2)+20mL O_(2)=30mL`
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