Q9 / 90 · JEE Main 2022 (27 Jul Shift 1) · Chemistry

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
  • Correct answer
    D
    Statement I is false but Statement II is true

Solution

The chlorides of both beryllium and aluminium have Cl– bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solvents and are strong Lewis acids. They are used as Friedel Craft catalysts.

Be2Cl4 is lewis acid and Al2Cl6 has complete octet.

Be and Al are amphoteric metals therefore dissolve in acid as well as alkaline solution and form beryllate and aluminate ions in excess alkali.

 Beryllium hydroxide dissolves in excess of alkali to give a beryllate ion,[Be(OH)4 ]2– just as aluminium hydroxide gives aluminate ion, [AlH2O2(OH)4]-

Hence, the correct answer is option: 'D'.

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