Name
(a) a yellow monoxide that dissolves in hot and concentrated caustic alkali.
(b) a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.
(c) a compound containing zinc in the anion.

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Solution

(a) Lead oxide (PbO) is a yellow monoxide that dissolves in a hot and concentrated caustic alkali.

PbO + 2 NaOH → Na₂PbO₂ + H₂O
Soluble

(b) Aluminium oxide (Al₂O₃) dissolves when fused with NaOH or KOH.

Al₂O₃+ 2 NaOH → 2 NaAlO₂ + H₂O
Soluble

(c) Sodium zincate (Na₂ZnO₂) contains Na⁺ as cation and ZnO₂²^- as anion.

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Name :

(a) a yellow monoxide that dissolves in hot and concentrated caustic alkali.
(b) a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.
(c) a compound containing zinc in the anion.

What is observed when hot concentrated caustic soda solution is added to (a) Zinc and (b) Aluminium oxide ? Write balanced equations.

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(a) a metallic hydroxide soluble in excess of $N H_{4} O H$ .
(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.

Q. Assertion :

We add caustic alkali to bauxite ore during purification of bauxite.

Reason: Bauxite dissolves in caustic alkali and thus impurities can be separated

Q. 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 coloured metal ions.
(f) two bases which are not alkalis but dissolve in strong alkalis.
(g) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

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Name (a) a yellow monoxide that dissolves in hot and concentrated caustic alkali. (b) a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash. (c) a compound containing zinc in the anion.

Name
(a) a yellow monoxide that dissolves in hot and concentrated caustic alkali.
(b) a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.
(c) a compound containing zinc in the anion.