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JEE CHEMISTRY MCQ: S-BLOCK ELEMENTS

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Analyzing +4 | -1

Assertion (A):

{LiCl}

and

{MgCl}_2

are soluble in ethanol.

Reason (R): Lithium and magnesium are harder than their respective group elements The correct option among the following is

View answer and explanation

Correct option: B

(A) is true, (R) is true but (R) is not the correct explanation for (A)

Option B ((A) is true, (R) is true but (R) is not the correct explanation for (A)) is correct because both LiCl and MgCl₂ are soluble in ethanol due to their covalent character, and both Li and Mg are indeed harder than their respective group elements, but the hardness is not the direct reason for solubility.

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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)

0.197 \mathrm{~g}

(B)

(A)

. In the Down’s cell

\mathrm{KCl}

\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}

{Cl}