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Match the column I (molecules/ions) with column II (acid/base) and choose the correct option from the codes given below.
Column I Column II
A. ${Mg}^{2 +}$ 1. Hard acid
B. $H_{2} O$ 2. Soft acid
C. $R_{3} P$ 3. Hard base
D. ${Ag}^{+}$ 4. Soft base
Codes

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A-1 B -3 C-4 D-2

A-4 B-2 C-4 D-3

A-1 B-2 C-4 D-3

A-4 B-3 C- 1 D-2

answer is A.

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Detailed Solution

$A \to 1; B \to 3; C \to 4; D \to 2 (a)$

${Mg}^{2 +} \to Hard acid$ $H_{2} O \to Hard base$

$R_{3} P \to Soft base$ ${Ag}^{+} \to Soft acid$

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