NEET · Chemistry · STD 12 - 2. Electrochemistry

Mass in grams of copper deposited by passing \(9.6487\) A current through a voltmeter containing copper sulphate solution for \(100\) seconds is (Given : Molar mass of \(\mathrm{Cu}: 63 \mathrm{~g} \mathrm{~mol}^{-1}, 1 \mathrm{~F}=96487 \mathrm{C}\) )

A \(0.315 \mathrm{~g}\)
B \(31.5 \mathrm{~g}\)
C \(0.0315 \mathrm{~g}\)
D \(3.15 \mathrm{~g}\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(0.315 \mathrm{~g}\)

Step-by-step Solution

Detailed explanation

\(\mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{Cu}(\mathrm{s})\) Mass of Cu deposited

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match the interhalogen compounds of \(column-I\) with the geometry in \(column-II\) and assign the correct code.

Column \(I\)	Column \(II\)
\((A) \,XX '\)	\((i)\) \(T-\)shape
\((B)\,XX'_3\)	\((ii)\) Pentagonal bipyramidal
\((C)\,XX '_5\)	\((iii)\) Linear
\((D)\,XX '_7\)	\((iv)\) Square pyramidal
	\((v)\) Tetrahedral

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