JEE CHEMISTRY MCQ: S-BLOCK ELEMENTS

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Analyzing +4 | -1

Which is not correctly matched?

(1) Basic strength of oxides:

{Cs}_2{O} < {Rb}_2{O} < {K}_2{O} < {Na}_2{O} < {Li}_2{O}

(2) Stability of peroxides:

{Na}_2{O}_2 < {K}_2{O}_2 < {Rb}_2{O}_2 < {Cs}_2{O}_2

(3) Stability of bicarbonates:

{LiHCO}_3 < {NaHCO}_3 < {KHCO}_3 < {RbHCO}_3 < {CsHCO}_3

(4) Melting point :

{NaF} < {NaCl} < {NaBr} < {NaI}

View answer and explanation

Correct option: A

1 and 4

Options A (1 and 4) is correct because the basic strength of oxides increases down the group, and the melting point of sodium halides decreases down the group due to increasing covalent character.

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.