1
AIPMT 2001
MCQ (Single Correct Answer)
+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+
2
AIPMT 2001
MCQ (Single Correct Answer)
+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
3
AIPMT 2000
MCQ (Single Correct Answer)
+4
-1
The entropy change in the fusion of one mole of a solid melting at 27oC (latent heat of fusion is 2930 J mol–1) is :
A
9.77 J/mol-K
B
10.77 J/mol-K
C
9.07 J/mol-K
D
0.977 J/mol-K
4
AIPMT 2000
MCQ (Single Correct Answer)
+4
-1
2Zn + O2 $$ \to $$ 2ZnO;  $$\Delta $$Go = $$-$$ 616 J
2Zn + S2 $$ \to $$ 2ZnS;  $$\Delta $$Go = $$-$$ 293 J
S2 + 2O2 $$ \to $$ 2SO2;   $$\Delta $$Go = $$-$$408 J
$$\Delta $$Go for the following reaction
2ZnS + 3O2 $$ \to $$  2ZnO + 2SO2 is
A
$$-$$ 731 J
B
$$-$$ 1317 J
C
$$-$$ 501 J
D
+ 731 J
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