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The - pair of elements has the same value of atomic radii though and are placed in different…
Assertion: The $\text{Zr}$-$\text{Hf}$ pair of elements has the same value of atomic radii though $\text{Zr}$ and $\text{Hf}$ are placed in different periods in the periodic table.
Reason: The lanthanoid contraction prevents the expected increase in atomic radii of $\text{Hf}$.
Given below are two statements marked Assertion and Reason. Read the two statements carefully and select the correct option.
- (a)Both Assertion and Reason are true and Reason is the correct explanation for Assertion.
- (b)Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.
- (c)Assertion is true and Reason is false.
- (d)Both Assertion and Reason are false.
Answer
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From ISC 2025 Chemistry Paper 1, question 1(B)(vii).