IIT-JEE 2007 · Paper 1 · Chemistry Q32

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ChemistryAssertion and reason+3 / -1Question 32 of 66

STATEMENT-1: Boron always forms covalent bond.

because

STATEMENT-2: The small size of $\ce{B^{3+}}$ favours formation of covalent bond.

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1

Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1

Statement-1 is True, Statement-2 is False

Statement-1 is False, Statement-2 is True

Answer and worked solution

Official answer: A

Statement 1. Boron forms covalent compounds; a $\ce{B^{3+}}$ ion does not exist in its compounds. True.

Statement 2. The very small size (and high charge) of $\ce{B^{3+}}$ would give it huge polarising power and a very high ionisation energy, so covalent bonding is favoured (Fajans' rules). True and it explains Statement 1.

(A)

Topics:Group 13 Ionic bonding

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IIT-JEE 2007 · Paper 1, Chemistry question 32