JEE CHEMISTRY MCQ: S-BLOCK ELEMENTS

1 Medium

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Analyzing +4 | -1

Choose the correct statement(s) among the following

(I)

{LiF}

is more soluble than

{LiClO}_4

in water.

(II) The standard reduction potential

\left[{E}^{\circ}\right]

{Li}

is more negative than that of

{Na}

.

(III) The heat of hydration of

{Li}^{+}({g})

is greater than that of

{Na}^{+}({g})

View answer and explanation

Correct option: C

II and III

Option C (II and III) is correct because Li has a more negative reduction potential than Na, and Li+ has a greater heat of hydration than Na+ due to its smaller size and higher charge density.

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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.