Identify the anion present in the compound X on heating with copper turning and concentrated sulphuric acid liberates a reddish brown gas?

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Solution

Nitrate ion, NO₃^-
Suppose the compound may be Sodium nitrate(NaNO₃)
When sodium nitrate reacts with sulphuric acid it forms sodium bisulphate and nitric acid.
NaNO₃ (aq) + H₂SO₄(aq) ⇢ NaHSO₄ (aq) + HNO₃(aq)
Then Copper reacts with this nitric acid forming copper nitrate and nitrogen dioxide(reddish-brown gas) and water.
Cu (s) + 4HNO₃(aq) ⇢ Cu(NO₃)₂(aq) + 2NO₂(g) + 2H₂O(aq)

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Similar questions

X, Y and Z are three crystalline solids which are soluble in water and have a common anion.

To help you to identify X, Y and Z, you are provided with the following experimental observations. Copy and complete the corresponding inferences in (a) to (e).

(a) A reddish-brown gas is obtained when X, Y and Z are separately warmed with concentrated sulphuric acid and copper turning added to the mixture.

INFERENCE 1 : The common anion is the .................. ion.

(b) When X is heated, it melts and gives off only one gas which re-lights a glowing splint.

INFERENCE 2 : The cation in X is either ................ or ....................

(c) The action of heat on Y produces a reddish-brown gas and a yellow residue which fuses with the glass of the test tube.

INFERENCE 3 : The metal ion present in Y is the .................... ion.

(d) When Z is heated, it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas which turns moist red litmus paper blue.

INFERENCE 4 : Z contans the ............ cation.

(e) Write the equations for the following reactions:

(1) X and concentrated sulphuric acid (below $200^{\circ}$ ). (One equation only for either of the cations given in INFERENCE 2).

(2) Action of heat on Y.

(3) Concentrated nitric acid is added to copper turnings kept in a beaker.

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.

Identify the anion present in the following compounds.

Compound X on heating with copper turnings and concentrated sulphuric acid liberates a reddish-brown gas.

Q. Salt S on heating with copper turning and sulphuric acid liberates a reddish brown gas.identify the anion S

Q. A compound which releases a reddish brown gas on reaction with concentrated sulphuric acid & copper turnings?

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