IIT-JEE 2007 · Paper 1 · Chemistry Q33

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ChemistryAssertion and reason+3 / -1Question 33 of 66

STATEMENT-1: In water, orthoboric acid behaves as a weak monobasic acid.

because

STATEMENT-2: In water, orthoboric acid acts as a proton donor.

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: C

Statement 1. $\ce{H3BO3}$ is a weak monobasic acid. True.

Statement 2. It is not a proton donor: it acts as a Lewis acid, accepting $\ce{OH-}$ from water,
$\ce{B(OH)3 + 2H2O <=> [B(OH)4]- + H3O+}.$
False.

(C)

Topics:Group 13 Acids and bases

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IIT-JEE 2007 · Paper 1, Chemistry question 33