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MCQEasyJEE 2023Group 17 Elements

JEE Chemistry 2023 Question with Solution

Identify X, Y, and Z in the following reaction. (Equation not balanced) ClO+NO2→X→H2OY+ZClO + NO_2 \rightarrow X \xrightarrow{H_2O} Y + Z

  • A

    X=ClONO2, Y=HOCl, Z=NO2X = ClONO_2, \, Y = HOCl, \, Z = NO_2

  • B

    X=ClONO2, Y=HCl, Z=HNO3X = ClONO_2, \, Y = HCl, \, Z = HNO_3

  • C

    X=ClONO2, Y=HOCl, Z=HNO3X = ClONO_2, \, Y = HOCl, \, Z = HNO_3

  • D

    X=ClO3, Y=Cl2, Z=NO2X = ClO_3, \, Y = Cl_2, \, Z = NO_2

Answer

Correct answer:C

Step-by-step solution

Standard Method

Given: The reaction is

ClO+NO2→X→H2OY+ZClO + NO_2 \rightarrow X \xrightarrow{H_2O} Y + Z

Find: The identities of XX, YY, and ZZ.

From the solution working, the intermediate formed is

ClO+NO2→ClONO2ClO + NO_2 \rightarrow ClONO_2

So, X=ClONO2X = ClONO_2.

On treatment with water, this compound hydrolyses as

ClONO2→H2OHOCl+HNO3ClONO_2 \xrightarrow{H_2O} HOCl + HNO_3

Therefore, Y=HOClY = HOCl and Z=HNO3Z = HNO_3.

Hence, the correct option from the listed choices is C. The solution contains a contradictory label stating option B, but its chemical working clearly gives X=ClONO2X = ClONO_2, Y=HOClY = HOCl, and Z=HNO3Z = HNO_3, which matches option C.

Using the hydrolysis step

Given: Chlorine monoxide reacts with nitrogen dioxide first, and the product then reacts with water.

The first step forms chlorine nitrate:

ClO+NO2→ClONO2ClO + NO_2 \rightarrow ClONO_2

This identifies XX.

The next step is hydrolysis of chlorine nitrate:

ClONO2+H2O→HOCl+HNO3ClONO_2 + H_2O \rightarrow HOCl + HNO_3

So the products are hypochlorous acid and nitric acid.

Thus,

  • X=ClONO2X = ClONO_2
  • Y=HOClY = HOCl
  • Z=HNO3Z = HNO_3

Therefore, the correct option is C.

Common mistakes

  • Choosing the option based only on the mislabeled statement in the solution. That is wrong because the worked reaction itself shows HOClHOCl and HNO3HNO_3 as products. Always match the final species with the listed options.

  • Assuming hydrolysis gives HClHCl instead of HOClHOCl. That is incorrect because hydrolysis of ClONO2ClONO_2 produces hypochlorous acid and nitric acid, not hydrochloric acid.

  • Not identifying the intermediate ClONO2ClONO_2 correctly from ClO+NO2ClO + NO_2. This leads to the wrong downstream products. First determine XX, then apply hydrolysis to find YY and ZZ.

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