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Read the assertion and reason below. Assertion (A): Boron cannot form the BF6³- ion. Reason (R): The atomic size of boron is very small. Choose the correct option.

1. Both (A) and (R) are true and (R) is the correct explanation of (A)
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
3. (A) is true but (R) is false
4. (A) is false but (R) is true

Correct answer: Both (A) and (R) are true and (R) is the correct explanation of (A)

Solution

Boron's small size (and absence of accessible d-orbitals) restricts it to a coordination number of at most 4, so BF6³- cannot form; the reason correctly explains the assertion.

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