Question

Q) Solution A is strong acid B weak acid C strong alkali
(i) Which solution contains solute molecules in
addition to water molecules
(ii) Which solution gives gelatinous white ppt with
zinc sulphate, ppt disappears in excess
(iii) Give example of a weak alkali.​

Answer 1

Answer:

1. Solution B — weak acid 2. Solution C — strong alkali 3. Solution B — weak acid 4. Ammonium hydroxide — weak alkali

Explanation:

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Answer 2

Answer:-

(i) Solution B (i.e. weak acid) contains solute molecules in addition to water molecules.

(ii) Solution C (i.e. strong alkali) gives a gelatinous white precipitate with zinc sulphate solution. The precipitate disappears when excess of this solution is added.

Equation:-

ZnSO4 + 2NaOH ---> Na2SO4 + Zn(OH)2

Zn(OH)2 is the gelatinous white precipitate.

(iii) Examples of weak alkali are ammonium hydroxide and calcium hydroxide.

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