1
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following reaction is possible at anode?
A
2Cr3+ + 7H2O $$\to Cr_2O_7^{2-}$$ + 14H+
B
F2 $$\to$$ 2F-
C
(1/2) O2 + 2H+ $$\to$$ H2O
D
none of these
2
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Change Language
When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are :
A
cathode = pure zinc, anode = pure copper
B
cathode = impure sample, anode = pure copper
C
cathode = impure zinc, anode = impure sample
D
cathode = pure copper, anode = impure sample
3
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Change Language
For a cell given below

AIEEE 2002 Chemistry - Electrochemistry Question 17 English
$$ \begin{aligned} \mathrm{Ag}^{+}+\mathrm{e}^{-} & \longrightarrow \mathrm{Ag}; E^{\circ}=x \\\\ \mathrm{Cu}^{2+}+2 e^{-} & \longrightarrow \mathrm{Cu}{;} E^{\circ}=y \end{aligned} $$

$$ E^{\circ} \text { cell is } $$ :
A
$x+2 y$
B
$2 x+y$
C
$y-x$
D
$y-2 x$
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