1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
In which case change in entropy is negative?
A
Sublimation of solid to gas
B
2H(g) $$ \to $$ H2(g)
C
Evaporation of water
D
Expansion of a gas at temperature
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
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
3
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Change Language
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
4
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
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
NEET Subjects
EXAM MAP