1
AIPMT 2014
+4
-1
Which of the following statements is correct for the spontaneous adsorption of a gas?
A
$$\Delta$$S is negative and, therefore $$\Delta$$H should be highly positive.
B
$$\Delta$$S is negative and therefore, $$\Delta$$H should be highly negative.
C
$$\Delta$$S is positive and therefore, $$\Delta$$H should be negative .
D
$$\Delta$$S is positive and therefore, $$\Delta$$H should also be highly positive.
2
AIPMT 2014
+4
-1
For the reaction, $${X_2}{O_{4\left( l \right)}}\,\, \to \,\,2X{O_{2(g)}}$$

$$\Delta$$U = 2.1 kcal, $$\Delta$$S = 20 cal K$$-$$1 at 300 K

Hence, G is
A
2.7 kcal
B
$$-$$ 2.7 kcal
C
9.3 kcal
D
$$-$$ 9.3 kcal
3
NEET 2013 (Karnataka)
+4
-1
When 5 litres of a gas mixture of methane and propane is perfectly combusted at 0oC and 1 atmosphere, 16 litres of oxygen at the same temperature and pressure is consumed, The amount of heat released from this combustion in kJ ($$\Delta$$Hcomb. (CH4) = 890 kJ mol$$-$$1, $$\Delta$$Hcomb. (C3H8) = 2220 kJ mol$$-$$1) is
A
38
B
317
C
477
D
32
4
NEET 2013 (Karnataka)
+4
-1
Three thermochemical equations are given below
(i)  C(graphite) + O2(g) $$\to$$ CO2(g); $$\Delta$$rHo = x kJ mol$$-$$1
(ii)  C(graphite) + $${1 \over 2}$$O2(g) $$\to$$ CO(g); $$\Delta$$rHo = y kJ mol$$-$$1
(iii)  CO(g) + $${1 \over 2}$$O2(g) $$\to$$ CO2(g); $$\Delta$$rHo = z kJ mol$$-$$1
Based on the above equations, find out which of the relationship given below is correct.
A
z = x + y
B
x = y + z
C
y = 2z $$-$$ x
D
x = y $$-$$ z
EXAM MAP
Medical
NEET