1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is [Given that 1 L bar = 100 J]
A
25 J
B
30 J
C
-30 J
D
5 kJ
2
NEET 2018
MCQ (Single Correct Answer)
+4
-1
The bond dissociation energies of X2 , Y2 and XY are in the ratio of 1 : 0.5 : 1. $$\Delta $$H for the formation of XY is –200 kJ mol–1. The bond dissociation energy of X2 will be
A
800 kJ mol–1
B
200 kJ mol–1
C
400 kJ mol–1
D
100 kJ mol–1
3
NEET 2017
MCQ (Single Correct Answer)
+4
-1
For a given reaction, $$\Delta $$H = 35.5 kJ mol$$-$$1 and $$\Delta $$S = 83.6 J K$$-$$1 mol$$-$$1. The reaction is spontaneous at (Assume that $$\Delta $$H and $$\Delta $$S do not vary with temperature.)
A
T > 425 K
B
all temperatures
C
T > 298 K
D
T < 425 K
4
NEET 2017
MCQ (Single Correct Answer)
+4
-1
A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy $$\Delta $$U of the gas in joules will be
A
$$-$$ 500 J
B
$$-$$ 505 J
C
+ 505 J
D
1136.25 J
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