JEE Mains · Chemistry · STD 12 - p -Block elements - ll

Given below are two statements: One is labelled as Assertion \(A\) and the other is labelled as Reason \(R\) Assertion \(A\): Permanganate titrations are not performed in presence of hydrochloric acid. Reason \(R\) : Chlorine is formed as a consequence of oxidation of hydrochloric acid. In the light of the above statements, choose the correct answer from the options given below.

A Both \(A\) and \(R\) are true and \(R\) is the correct explanation of \(A\)
B Both \(A\) and \(R\) are true but \(R\) is NOT the correct explanation of \(A\)
C \(A\) is true but \(R\) is false
D \(A\) is false but \(R\) is true

Verified Solution

Answer & Solution

Correct Answer

(A) Both \(A\) and \(R\) are true and \(R\) is the correct explanation of \(A\)

Step-by-step Solution

Detailed explanation

\(2 KMnO _{4}+16 HCl \rightarrow 2 MnCl _{2}+2 KCl +8 H _{2} O + Cl _{2}\) \(HCl\) gets oxidised by \(KMnO _{4}\) into \(Cl _{2}\)

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

Explore more questions on app

From JEE Mains

Explore more questions on app