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Chemistry · 2026 · 3 marks
CBSE 2026 · Region 4 · Set 1 · Q24
Answer the following questions: (a) Why is direct current (DC) not used to measure the resistance of an ionic solution? (b) Why are the products of…
Answer the following questions :
(a)
Why is direct current (DC) not used to measure the resistance of an ionic solution?
(b)
Why are the products of electrolysis different for the electrolysis of aqueous solution of $\displaystyle \mathrm{AgNO}_{3}$ with silver electrodes and electrolysis of aqueous solution of $\displaystyle \mathrm{AgNO}_{3}$ with platinum electrodes ?
(c)
Why are magnesium blocks fixed to the iron pipelines carrying water?
Marking-scheme solution
(a)
DC can change the composition of the solution.
(b)
Because silver electrode is reactive and participates in the electrode reactions
whereas platinum is inert and does not take part in the chemical reaction and acts only
as a source of electrons.
(c)
To prevent oxidation of Iron or rusting, as Mg gets readily oxidised in comparison
to Iron.
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.