1
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
When 0.1 mol MnO$$_4^{2 - }$$ is oxidised the quantity of electricity required to completely oxidise MnO$$_4^{2 - }$$ to MnO$$_4^ - $$ is
A
96500 C
B
2 $$ \times $$ 96500 C
C
9650 C
D
96.50 C
2
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
How many gram of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current of 10 amperes for 109 minutes (1 Faraday = 96,500 C; Atomic mass of Co = 59 u)
A
4.0
B
20.0
C
40.0
D
0.66
3
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Consider the half-cell reduction reaction
Mn2+ + 2e$$-$$ $$ \to $$ Mn, Eo = $$-$$1.18 V
Mn2+ $$ \to $$ Mn3+ + e$$-$$, Eo = $$-$$ 1.51 V
The $$E$$o for the reaction 3 Mn2+ $$ \to $$ Mno + 2Mn3+, and possibility of the forward reaction are respectively
A
$$-$$ 4.18 V and yes
B
+ 0.33 V and yes
C
+ 2.69 V and no
D
$$-$$ 2.69 V and no
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
At 25oC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm$$-$$1 cm2 mol$$-$$1 and at infinite dilution its molar conductance is 238 ohm$$-$$1 cm2 mol$$-$$1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is
A
4.008%
B
40.800%
C
2.080%
D
20.800%
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