Question

Name:

(a) a metallic hydroxide soluble in excess of NH4OH.

(b) a metallic oxide soluble in excess of caustic soda solution.

(c) a strong alkali.

(d) a weak alkali.

(e) Two colourless metal ions.

(f) Two coloured metal ions.

(g) a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.

(h) Two bases which are not alkalis but dissolve in strong alkalis.

(i) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

(j) a colourless cation not a representative element.

Answer 1

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Name:

(a) a metallic hydroxide soluble in excess of NH4OH.

(b) a metallic oxide soluble in excess of caustic soda solution.

(c) a strong alkali.

(d) a weak alkali.

(e) Two colourless metal ions.

(f) Two coloured metal ions.

(g) a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.

(h) Two bases which are not alkalis but dissolve in strong alkalis.

(i) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

(j) a colourless cation not a representative element

$\huge\mathcal{\fcolorbox{lime}{black}{\blue{AnsweR :-}}}$

(a) Cu(OH)2

(b) ZnO

(c) NaOH

(d) NH4OH

(e) Na+, Ca2+

(f) Fe2+, Mn2+

(g) Aluminium

(h) Zn(OH)2 and Al(OH)3

(i) PbO

(j) Ammonium ion

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Answer 2

Copper (II) hydroxide is amphoteric in nature and soluble in excess ammonium hydroxide.