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5
MCQ (Single Correct Answer)

Which of the following statement is not correct about an inert electrode in a cell?

A
It does not participate in the cell reaction
B
It provides surface either for oxidation or for reduction reaction
C
It provides surface for conduction of electrons
D
It provides surface for redox reaction
6
MCQ (Single Correct Answer)

An electrochemical cell can behave like an electrolytic cell when ........... .

A
$E_{\text {cell }}=0$
B
$E_{\text {cell }}>E_{\text {ext }}$
C
$E_{\text {ext }}>E_{\text {cell }}$
D
$E_{\text {cell }}=E_{\text {ext }}$
7
MCQ (Single Correct Answer)

Which of the statements about solutions of electrolytes is not correct?

A
Conductivity of solution depends upon size of ions
B
Conductivity depends upon viscosity of solution
C
Conductivity does not depend upon solvation of ions present in solution
D
Conductivity of solution increases with temperature
8
MCQ (Single Correct Answer)

Using the data given below find out the strongest reducing agent.

$$\begin{aligned} & \mathrm{E}^{\mathrm{S} \mathrm{Cr}_2 \mathrm{O}^{2-} / \mathrm{Cr}^{3+}} 1.33 \mathrm{~V} ; \quad \mathrm{E}^{\mathrm{s}} \mathrm{Cl}_2 / \mathrm{Cl}^{-}=1.36 \mathrm{~V} \\ & \mathrm{E}^{\mathrm{S}} \mathrm{MnO}_4^{-} / \mathrm{Mr}^{2+}=1.51 \mathrm{~V} ; \mathrm{E}^{\mathrm{s}} \mathrm{Cr}^{3+} / \mathrm{Cr}=-0.74 \mathrm{~V} \end{aligned}$$

A
$\mathrm{Cl}^{-}$
B
$\mathrm{Cr}$
C
$\mathrm{Cr}^{3+}$
D
$\mathrm{Mn}^{2+}$
9
MCQ (Single Correct Answer)

Use the data given in Q. 8 and find out which of the following is the strongest oxidising agent?

A
$\mathrm{Cl}^{-}$
B
$\mathrm{Mn}^{2+}$
C
$\mathrm{MnO}_4^{-}$
D
$\mathrm{Cr}^{3+}$
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