A and B formed in the following reactions are: Cr2 O7^2- + 4 NaOH Na2 Cr2 O4 + 2 NaCl + 2 H2 O A + 2 Cl2 + 2 H2 O B + 3 H2 O

Given: The products A and B are to be identified from the two reactions. Find: The correct pair corresponding to A and B. From the given reaction, A is identified as Na2 Cr2 O4. The solution statement further gives that when A reacts with Cl2 and H2 O, it forms CrO3. Therefore, A = Na2 Cr2 O4 and B = CrO3. The correct option is A.

A and B formed in the following reactions are: Cr2 O7^2- + 4 NaOH… — Solution | JEE Chemistry

MCQEasyJEE 2024Potassium Dichromate & Permanganate

A and B formed in the following reactions are:

\text{Cr}_2\text{O}_7^{2-} + 4\text{NaOH} \rightarrow \text{Na}_2\text{Cr}_2\text{O}_4 + 2\text{NaCl} + 2\text{H}_2\text{O}

A + 2\text{Cl}_2 + 2\text{H}_2\text{O} \rightarrow B + 3\text{H}_2\text{O}

A
A = $\text{Na}_2\text{Cr}_2\text{O}_4$ , B = $\text{CrO}_3$
B
A = $\text{Na}_2\text{Cr}_2\text{O}_4$ , B = $\text{Cr}_2\text{O}_7$
C
A = $\text{Na}_2\text{Cr}_2\text{O}_4$ , B = $\text{NaCrO}_4$
D
A = $\text{Na}_2\text{Cr}_2\text{O}_4$ , B = $\text{Cr}_3\text{O}_8$

Answer

Correct answer:A

Step-by-step solution

Standard Method

Given: The products $A$ and $B$ are to be identified from the two reactions.

Find: The correct pair corresponding to $A$ and $B$ .

From the given reaction, $A$ is identified as $\text{Na}_2\text{Cr}_2\text{O}_4$ .

The solution statement further gives that when $A$ reacts with $\text{Cl}_2$ and $\text{H}_2\text{O}$ , it forms $\text{CrO}_3$ .

Therefore, $A = \text{Na}_2\text{Cr}_2\text{O}_4$ and $B = \text{CrO}_3$ .

The correct option is A.

Common mistakes

Assuming $B$ is a dichromate species because the starting ion contains chromium is incorrect. The product must be taken from the given reaction outcome in the solution, which identifies $B$ as $\text{CrO}_3$ .
Confusing option numbering with option labels can lead to the wrong response. Here, source option (1) maps to label A, so the final answer should be A, not 1.

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