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JEE CHEMISTRY MCQ: S-BLOCK ELEMENTS

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A: The first elements of I and II groups, lithium and beryllium differ in some of the chemical properties with other elements of their respective groups.

R: The first element of every group is very small in size, possesses high electronegative value and has only '

S

' and '

P

' orbitals in its valence orbital.

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Correct option: A

Both A and R are true and R is the correct explanation of A

Option A is correct because both the assertion and the reason are true, and the reason correctly explains why lithium and beryllium differ in chemical properties from other elements in their respective groups.

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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}