JEE CHEMISTRY MCQ: S-BLOCK ELEMENTS

1 Medium

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Analyzing +4 | -1

Assertion (A) : Ether can extract

{LiCl}

from the aqueous solution of a mixture of

{LiCl}, {NaCl}

and

{KCl}

.

Reason (R): Hydration of

{Li}^{+}

ion is greater than that of

{Na}^{+}

and

{K}^{+}

ions.

View answer and explanation

Correct option: B

Both

\mathbf{A}

and

\mathbf{R}

are true but

\mathbf{R}

is not the correct explanation of

\mathbf{A}

Option B is correct because both the assertion and reason are true, but the reason does not explain the assertion. LiCl is soluble in ether due to its covalent character, while the hydration energies are a separate property.

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.