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Chemistry · 2022 · 2 marks
CBSE 2022 · Region 3 · Set 1 · Q2
(i) Why on dilution the Λ_m of CH_3 COOH increases very fast, while that of CH_3 COONa increases gradually? (ii) What happens if external potential…
(i)
Why on dilution the $\displaystyle \mathbf{\Lambda}_{\mathrm{m}}$ of $\displaystyle \mathrm{CH}_{3} \mathrm{COOH}$ increases very fast, while that of $\displaystyle \mathrm{CH}_{3} \mathrm{COONa}$ increases gradually?
(ii)
What happens if external potential applied becomes greater than $\displaystyle \mathrm{E}^{\circ}$ cell of electrochemical cell ?
Marking-scheme solution
(i) On dilution, degree of ionization increases for weak \(\displaystyle \mathrm{CH}_{3} \mathrm{COOH}\) whereas \(\displaystyle \mathrm{CH}_{3} \mathrm{COONa}\) is strong electrolyte and almost completely dissociated / Graphical explanation.
(ii) Electrochemical cell will start functioning as electrolytic cell / cell reaction is reversed.
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