COMEDK 2026 Afternoon Shift | Electrochemistry Question 1 | Chemistry

The quantity of Ca that can be produced from molten $\mathrm{CaCl}_2$, with the same quantity of electricity (in coulombs) required to produce 4.8 g of Mg from molten $\mathrm{MgCl}_2$ is: [Atomic mass of $\mathrm{Mg}=24 \mathrm{u}$; Atomic mass of $\mathrm{Ca}=40 \mathrm{u}$ ]

5.2 g

6.0 g

8.0 g

4.8 g

COMEDK 2026 Afternoon Shift

MCQ (Single Correct Answer)

-0

Which of the following is always true about a spontaneous cell reaction in a galvanic cell?

$E_{\text {cell }}^o> 0 ; \Delta G^o<0 ; Q_C< K_C$

$E_{\text {cell }}^o=0 ; \Delta G^o<0 ; Q_C=K_C$

$E_{\text {cell }}^o< 0 ; \Delta G^o>0 ; Q_C< K_C$

$ E_{\text {cell }}^o>0 ; \Delta G^o<0 ; Q_C>K_C$

COMEDK 2026 Afternoon Shift

MCQ (Single Correct Answer)

-0

Resistance of 0.2 M solution of an electrolyte is $50 \Omega$. The conductivity of the solution is $1.3 \mathrm{Sm}^{-1}$. If the resistance of 0.4 M solution of the same electrolyte is $260 \Omega$, its molar conductivity is:

$6.25 \times 10^{-3} \mathrm{Sm}^2 \mathrm{~mol}^{-1}$

$62.5 \times 10^{-4} \mathrm{Sm}^2 \mathrm{~mol}^{-1}$

$6.25 \times 10^{-4} \mathrm{Sm}^2 \mathrm{~mol}^{-1}$

$625 \times 10^{-4} \mathrm{Sm}^2 \mathrm{~mol}^{-1}$

COMEDK 2026 Afternoon Shift

MCQ (Single Correct Answer)

-0

The $\Delta \mathrm{G}^{\circ}$ for the reaction, $C d^{2+}(a q)+Z n(s) \rightarrow Z n^{2+}(a q)+C d(s)$ is:

$\left[E_{C d^{2+} / C d}^o=-0.403, E_{Z n^{2+} / Z n}^o=-0.763 \mathrm{~V}\right]$

$-69.5 k J$

$-72.2 kJ$

$-44.5 kJ$

$-50 kJ$

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