s-Block Elements — JEE Main · 2022 · 27 Jul 2022 · Shift 1 Question with Solution

Given below are two statements:

Statement I: The chlorides of Be and Al have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases.

Statement II: Hydroxides of Be and Al dissolve in excess alkali to give beryllate and aluminate ions.

In the light of the above statements. Choose the correct answer from the options given below.

(A)Both statement I and Statement II are true
(B)Both statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true✓ Correct

Answer: (D)

Solution

Statement I is false: While

BeCl X_{2}

and

AlCl X_{3}

do have chlorine-bridged dimeric structures (

Be X_{2} Cl X_{4}

and

Al X_{2} Cl X_{6}

) and are soluble in organic solvents, they act as Lewis acids (electron-pair acceptors), not Lewis bases.

Statement II is true: Both Be and Al are amphoteric metals. Their hydroxides dissolve in excess alkali:

Be (OH) X_{2} + 2 OH X^{-} [Be (OH) X_{4}] X^{2 -} (beryllate)

Al (OH) X_{3} + OH X^{-} [Al (OH) X_{4}] X^{-} (aluminate)

The answer is (D).

JEE Main · 2022 · 27 Jul 2022 · Shift 1 · Single correct option

JEE Main · 2022 · 27 Jul 2022 · Shift 1 · s-Block Elements

Solution

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