1
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
Given : $$E_{F{e^{3 + }}/Fe}^o$$ = -0.036V; $$E_{F{e^{2 + }}/Fe}^o$$ = -0.439 V
The value of standard electrode potential for the change,
Fe3+ (aq) + e- $$\to$$ Fe2+ (aq) will be
A
-0.072 V
B
0.385 V
C
0.770 V
D
0.270
2
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is
CH3OH(l) + 3/2O2 $$\to$$ CO2 (g) + 2H2O (l)
At 298K standard Gibb’s energies of formation for CH3OH(l), H2O(l) and CO2 (g) are -166.2, -237.2 and -394.4 kJ mol−1 respectively. If standard enthalpy of combustion of methanol is -726 kJ mol−1, efficiency of the fuel cell will be
A
87%
B
90%
C
97%
D
80%
3
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2=0.301) :
A
230.3 minutes
B
23.03 minutes
C
46.06 minutes
D
460.6 minutes
4
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Which one of the following reactions of Xenon compounds is not feasible?
A
XeO3 + 6HF $$\to$$ XeF6 + 3H2O
B
XeF6 + RbF $$\to$$ Rb(XeF7]
C
2XeF2 + 2H2O $$\to$$ 2Xe + 4HF + O2
D
3XeF4 + 6H2O $$\to$$ 2Xe + XeO3 + 12HF + 1.5O2
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