Question

Given below are two statements:
Statement I: $\mathrm{K>Mg>Al>B}$ is the correct order in terms of metallic character.
Statement II: Atomic radius is always greater than the ionic radius for any element.
In the light of the above statements, choose the correct answer from the options given below:

• A. Statement I is false but Statement II is true
• B. Statement I is true but Statement II is false
• C. Both Statement I and Statement II are false
• D. Both Statement I and Statement II are true
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Hint:

Cations shrink, anions expand — always check the charge before comparing radii.

Answer 1

The Correct Option is B

Step 1: Analysis of Statement I.
Metallic character increases down a group and decreases from left to right across a period.
Potassium is the most metallic, followed by magnesium, aluminium and then boron.
Hence, the order $\mathrm{K>Mg>Al>B}$ is correct.
Statement I is true.
Step 2: Analysis of Statement II.
Atomic radius is not always greater than ionic radius.
For cations, ionic radius is smaller than atomic radius.
For anions, ionic radius is larger than atomic radius.
Hence, the statement is incorrect.
Statement II is false.
Step 3: Conclusion.
Statement I is true but Statement II is false.