$A{\rm{and}}B$ are two salts. $A$ with dilute ${\rm{HCl}}$ and $B$ with conc. ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$ react to give reddish brown vapours, hence $A$ and $B$ respectively are:

${\rm{NaN}}{{\rm{O}}_2},{\rm{NaBr}}$

${\rm{NaBr}},{\rm{NaN}}{{\rm{O}}_3}$

${\rm{NaN}}{{\rm{O}}_3},{\rm{NaBr}}$

${\rm{NaBr}},{\rm{NaN}}{{\rm{O}}_2}$

NEET UG CHEMISTRY MCQ: S-BLOCK ELEMENTS

1 Medium

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Analyzing +4 | -1

A\mathrm{and}B

are two salts.

A

with dilute

\mathrm{HCl}

and

B

with conc.

{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}

react to give reddish brown vapours, hence

A

and

B

respectively are:

View answer and explanation

Correct option: D

\mathrm{NaN}{\mathrm{O}_2},\mathrm{NaBr}

Option D (

\mathrm{NaN}{\mathrm{O}_2},\mathrm{NaBr}

) is correct because

\mathrm{NaBr}

with conc.

{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}

and

\mathrm{NaN}{\mathrm{O}_2}

with dilute

\mathrm{HCl}

produce reddish-brown vapors.