Compound A on strong heating in a boiling tube gives off reddish brown fumes and a yellow residue. When the aqueous solution of A is treated with a few drops of sodium hydroxide solution, a white precipitate appeared. Identify the cation and anion present in the compound A.

Copper (II) and nitrate

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Lead (II) and chloride

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Zinc and sulphate

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Lead (II) and nitrate

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Solution

The correct option is A Copper (II) and nitrate
Compound A on strong heating in a boiling tube gives off reddish brown fumes and a yellow residue.
Brown colour of gas is characteristic of NO $_{2}$ . Yellow residue indicates presence of either Cu or Pb or Zn
With a few drops of sodium hydroxide solution, a white precipitate appeared. This indicates presence of Cu
$C u^{2 +} (a q) + 2 O H^{-} (a q) \to C u (O H)_{2} ↓ (white ppt)$
Hence, the cation and anion present in the compound A are copper (II) and nitrate respectively.

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Similar questions

Q. Identify the substances P, Q, and R in each case based on the information given below:
(i) The deliquescent salt P, turns yellow on dissolving in water, and gives a reddish brown precipitate with sodium hydroxide solution.
(ii) The white crystalline solid Q is soluble in water. It liberates a pungent smelling gas when heated with sodium hydroxide solution.
(iii) The pale green solid R turns reddish brown on heating. Its aqueous solution gives a white precipitate with barium chloride solution. The precipitate is insoluble in mineral acids.

Q. (d) Match the following:

	Column A	Column B
(i)	A substance that turns moist starch iodide paper blue.	Ferrous sulphate
(ii)	A compound which releases a reddish brown gas on reaction with concentrated sulphuric acid and copper turnings.	Chlorine
(iii)	A solution of this compound gives a dirty green precipitate with sodium hydroxide.	Copper nitrate
(iv)	A compound which on heating with sodium hydroxide produces a gas which forms dense white fumes with hydrogen chloride.	Lead carbonate
(v)	A white solid which gives a yellow residue on heating.	Ammonium sulphate

Q. Match the following:

	Column A	Column B
1.	A substance that turns moist starch iodide paper blue.	A. Ammonium sulphate
2.	A compound which releases a reddish brown gas on reaction with concentrated sulphuric acid and copper turnings.	B. Lead carbonate
3.	A solution of this compound gives a dirty green precipitate with sodium hydroxide.	C. Chlorine
4.	A compound which on heating with sodium hydroxide produces a gas which forms dense white fumes with hydrogen chloride.	D. Copper nitrate
5.	A white solid which gives a yellow residue on heating.	E. Ferrous sulphate.

An aqueous solution of a salt (A) gives white precipitate (B) with sodium chloride solution. The filtrate gives a black precipitate. (C) When $H_{2} S$ is passed into it. Compound (B) dissolves in hot water and the solution gives a yellow precipitate (D) on treatment with sodium iodide. The compound (A) does not give any gas with dilute HCl but liberates a reddish brown gas on heating. Identify the compound (A) to (D).

Q. An unknown inorganic compound

(X)

gave the following reaction:
(i) on heating

^{'} X^{'}

gave a residue, oxygen and oxide of nitrogen.
(ii) addition of acetic acid and

K_{2} C r_{2} O_{7}

to its aqueous solution give a yellow precipitate.
(iii) addition of

N a O H

to its aqueous solution first forms a white precipitate, Dissolve in the excess of the reagent.
Identify the compound

(X)

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