1
IIT-JEE 2009 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

The term that corrects for the attractive forces present in a real gas in the van der Waals equation is

A
$$nb$$
B
$${{a{n^2}} \over {{V^2}}}$$
C
$$ - {{a{n^2}} \over {{V^2}}}$$
D
$$ - nb$$
2
IIT-JEE 2007 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

Match gases under specified conditions listed in Column I with their properties/laws in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 $$\times$$ 4 matrix given in the ORS.

Column I Column II
(A) hydrogen gas (P = 200 atm, T = 273 K) (P) Compressibility factor $$\ne$$ 1
(B) hydrogen gas (P $$\sim$$ 0, T = 273 K) (Q) attractive forces are dominant
(C) CO$$_2$$ (P = 1 atm, T = 273 K) (R) PV = nRT
(D) real gas with very large molar volume (S) $$P(V-nb)=nRT$$

A
A - (s); B - (r); C - (q); D - (p, s)
B
A - (p, s); B - (r, q); C - (p, q); D - (s)
C
A - (p); B - (r); C - (p, q); D - (s)
D
A - (p, s); B - (r); C - (p, q); D - (p, s)
3
IIT-JEE 1986
MCQ (Single Correct Answer)
+1
-0.25
The average velocity of an ideal gas molecule at 27oC is 0.3m/sec. The average velocity at 927oC will be
A
0.6 m/sec
B
0.3 m/sec
C
0.9 m/sec
D
3.0 m/sec
4
IIT-JEE 1985
MCQ (Single Correct Answer)
+1
-0.25
Rate of diffusion of a gas is
A
directly proportional to its density
B
directly proportional to the square root of its molecular weight
C
inversely proportional to the square root of its molecular weight.
D
directly proportional to its molecular weight

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