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Q.

Which of the following gases follows non-ideal behaviour?

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a

N2 gas having density 1.25 g L-1 at STP

b

2.8 g CO gas in 0.1 L flask exerting a pressure of 24.63 atm at 300 K

c

1.6 g CH4 in 0.5 L flask at 273 K exerting a pressure of 4 atm

d

0.1 g H2 gas at STP occupies volume of 1.12 L

answer is C.

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Detailed Solution

Non-ideal behaviour is followed if pV≠nRT (a) p=nVRT=WmVRT=dRTmLHS p = l atm RHS dRTm=1.25gL−1×0.0821Latmmol−1K−1×273K28gmol−1                   = 1Thus, p=dRTm Thus, ideal behaviour  (b) pV=nRT24.63×0.1=2.828×0.0821×3002.463 = 2.463Thus, ideal behaviour. (c) pV=nRT4×0.5=1.616×0.0821×2732 = 2.24 Thus, pV≠nRTThus, non-ideal behaviour.
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