JEE CHEMISTRY MCQ: S-BLOCK ELEMENTS

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Select the correct statements

(i)

\mathrm{Cs}^{+}

is more highly hydrated that the other alkali metal ions

(ii) Among the alkali metals

\mathrm{Li}, \mathrm{Na}, \mathrm{K}

and

\mathrm{Rb}

, lithium has the highest melting point

(iii) Among the alkali metals only lithium forms a stable nitride by direct combination with nitrogen

View answer and explanation

Correct option: D

(ii) and (iii)

Option D ((ii) and (iii)) is correct because Li+ is more hydrated, Li has the highest melting point among alkali metals, and only Li forms a stable nitride.

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.