1
AIPMT 2001
+4
-1
Change in enthalpy for reaction,

2H2O2(l) $$\to$$ 2H2O(l) + O2(g)

if heat of formation of H2O2(l) and H2O(l) are $$-$$188 and - 286 kJ/mol respectively, is
A
$$-$$ 196 kJ/mol
B
+ 196 kJ/mol
C
+948 kJ/mol
D
$$-$$ 948 kJ/mol
2
AIPMT 2001
+4
-1
When 1 mol of gas is heated at constant volume temperature is raised from 298 to 308 K. Heat supplied to the gas is 500 J. Then which statement is correct ?
A
q = w = 500 J, $$\Delta$$E = 0
B
q = $$\Delta$$E = 500 J, w = 0
C
q = w = 500 J, $$\Delta$$E = 0
D
$$\Delta$$E = 0, q = w = $$-$$ 500 J
3
AIPMT 2001
+4
-1
PbO2  $$\to$$ PbO; $$\Delta$$G298 < 0
SnO2 $$\to$$ SnO;  $$\Delta$$G298 > 0

Most probable oxidation state of Pb and Sn will be
A
Pb4+, Sn4+
B
Pb4+, Sn2+
C
Pb2+, Sn2+
D
Pb2+, Sn4+
4
AIPMT 2001
+4
-1
Enthalpy of CH4 + $${1 \over 2}$$ O2 $$\to$$ CH3OH is negative. If enthalpy of combustion of CH4 and CH3OH are x and y respectively. Then which relation is correct?
A
x > y
B
x < y
C
x = y
D
x3 y
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