KCET · Chemistry · Aldehydes and Ketones

Sodium ethanoate on heating with soda lime gives ' \(X\) '. Electrolysis of aqueous solution of sodium ethanoate gives ' \(Y^{\prime}, X^{\prime}\) and ' \(Y^{\prime}\) respectively are

A methane and ethane
B methane and methane
C ethane and methane
D ethane and ethane

Verified Solution

Answer & Solution

Correct Answer

(A) methane and ethane

Step-by-step Solution

Detailed explanation

The complete reaction sequence involved is as follows
\(\underset{\text { Sodium ethanoate }}{\mathrm{CH}_3 \mathrm{COONa}}+\underset{\substack{\text { Sodium } \\ \text { hydroxide }}}{\mathrm{NaOH}} \xrightarrow[\Delta]{\mathrm{CaO}} \underset{\substack{\text { Methane } \\(X)}}{\mathrm{CH}_4}+\mathrm{Na}_2 \mathrm{CO}_3\)

Thus, the compounds \(X\) and \(Y\) are methane and ethane respectively.

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 List-I (Laws) with the List-II (Mathematical expressions):

List-I		List-II
(a)	Henry's law	(i)	\(p_1 = p_1^0 x_1\)
(b)	Raoult's law	(ii)	\(p = K_H \chi\)
(c)	First law of thermodynamics	(iii)	\(\Lambda_m = v_+ \lambda_+ + v_- \lambda_-\)
(d)	Kohlrausch's law	(iv)	\(\Delta U = q + w\)

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