MCQEasyJEE 2023Group 17 Elements

JEE Chemistry 2023 Question with Solution

Given below are two statements:

Statement I: Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode.

Statement II: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens.

In the light of the above statements, choose the correct answer from the options given below:

  • A

    Both the statements I and II are true

  • B

    Statement I is true but Statement II is false

  • C

    Statement I is false but Statement II is true

  • D

    Both the Statements I and II are false

Answer

Correct answer:A

Step-by-step solution

Standard Method

Given: Two statements about chlorine and chemical reactivity are to be evaluated.

Find: Which option correctly describes the truth values of Statement I and Statement II.

From the solution:

  1. Statement I: Chlorine forms oxides such as Cl2OCl_2O, ClO2ClO_2 and Cl2O7Cl_2O_7. These oxides are highly reactive and unstable, and some show explosive tendency. Therefore, Statement I is true.

  2. Statement II: The chemical reactivity of an element can be assessed from its reactions with common elements such as oxygen and halogens. Therefore, Statement II is true.

Conclusion: Both Statement I and Statement II are true. Hence, the correct option should be A.

The solution also contains an internal discrepancy where it displays B and later states 2 the correct answer, but the worked explanation clearly shows that both statements are true. Therefore, the defensible final answer is A.

Statement-wise Evaluation

Given:

  • Statement I concerns formation and stability of chlorine oxides.
  • Statement II concerns judging chemical reactivity from reactions with oxygen and halogens.

Find: The correct truth combination.

For Statement I, chlorine is known to form several oxides like Cl2OCl_2O, ClO2ClO_2 and Cl2O7Cl_2O_7. These compounds are generally unstable and reactive, and some possess explosive nature. So Statement I is true.

For Statement II, reactions with oxygen and halogens are commonly used to understand how readily an element forms compounds and how stable those compounds are. This helps assess the element's chemical reactivity. So Statement II is true.

Therefore, both statements are true, so the correct option is A.

Common mistakes

  • Assuming that because chlorine is a non-metal, it cannot form oxides. This is incorrect because chlorine does form several oxides; the issue is their instability, not their non-existence.

  • Treating Statement II as too general and marking it false. In chemistry, reactions with oxygen and halogens are standard indicators of bonding tendency and reactivity.

  • Following the displayed option letter in the solution without checking the explanation. The explanation establishes that both statements are true, so the conclusion must match that logic.

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