$A{\rm{and}}B$ 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:

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

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

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

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

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JEE CHEMISTRY MCQ: S-BLOCK ELEMENTS

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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 (NaN{O_2},NaBr) is correct because NaN{O_2} with dilute HCl and NaBr with conc. H{_2}S{O_4} both produce reddish-brown vapors (NO{_2} and Br{_2} respectively).

More Questions from S-BLOCK ELEMENTS

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Assertion (A): Among the alkali metals, lithium salts exhibit the least electrical condutance in aqueous solutions.
Reason (R): Smaller the radius of the hydrated cation, lower is the electrical conductance in aqueous solutions.

(A)

is a ternary salt with divalent cation.

(A)

gives yellow ppt. with

\mathrm{K}_2 \mathrm{CrO}_4

as well as with

\mathrm{AgNO}_3

. (A) is precipitated by

\mathrm{H}_2 \mathrm{~S}

neither in acidic nor ammoniacal medium, but addition of

\left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3

\mathrm{NH}_4 \mathrm{OH}

gave white ppt. (B).

0.297 \mathrm{~g}

(A)

gave

0.197 \mathrm{~g}

(B)

. Identify

(A)

. In the Down’s cell

\mathrm{KCl}

is added in

\mathrm{NaCl}

to: Which of the alkali metal is having least melting point? Fusion mixture is comprised of: Statement 1:

{LiCl}

is predominatly a covalent compound.

Statement 2: Electronegativity difference between

{Li}

and

{Cl}

is too small.