JEE CHEMISTRY MCQ: 13 TH GROUP ELEMENTS (P-BLOCK)

1 Medium

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Analyzing +4 | -1

Assertion (A):

\mathrm{HBF}_4

is a very strong acid.

Reason

(\mathbf{R}): \mathrm{B}(\mathrm{OH})_3

behaves as an acid in the following reaction :

\mathrm{B}(\mathrm{OH})_3+4 \mathrm{HF} \longrightarrow \mathrm{H}_3 \mathrm{O}^{+}+\left[\mathrm{BF}_4 \right]^{-}+2 \mathrm{H}_2 \mathrm{O}.

View answer and explanation

Correct option: C

\mathbf{A}

is true but

\mathbf{R}

is false.

Option D (

N{H_4}Cl

- Both cationic and anionic hydrolysis) is the wrong match because

NH_4Cl

undergoes cationic hydrolysis only.

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