JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties

Given below are two statements: Statement- \(I\): Along the period, the chemical reactivity of the element gradually increases from group \(1\) to group \(18\). Statement - \(II\): The nature of oxides formed by group \(1\) element is basic while that of group \(17\) elements is acidic.In the the light above statements, choose the most appropriate from the questions given below:

A Both statement \(I\) and Statement \(II\) are true.
B Statement \(I\) is true but Statement \(II\) is False.
C Statement \(I\) is false but Statement \(II\) is true.
D Both Statement \(I\) and Statement \(II\) is false.

Verified Solution

Answer & Solution

Correct Answer

(C) Statement \(I\) is false but Statement \(II\) is true.

Step-by-step Solution

Detailed explanation

Chemical reactivity of elements decreases along the period therefore statement \(-\mathrm{I}\) is false. \(Group -1\) elements from basic nature oxides while group - \(17\) elements form acidic oxides therefore statement \(-\mathrm{II}\) is true.

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.

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