Name the following:
(a) Products obtained by dissolving sulphur dioxide and chlorine in water.
(b) The catalyst used in the contact process.
(c) Solution obtained by dissolving sulphur trioxide in 98% sulphuric acid.
(d) Products obtained by treating zinc with dilute sulphuric acid.
(e) Products obtained by treating ferrous sulphide with dilute sulphuric acid.
(f) The precipitate obtained by treating aqueous lead nitrate with dilute sulphuric acid.
(g) The precipitate obtained by treating aqueous barium chloride with dilute sulphuric acid.
(h) Gases obtained by treating carbon with hot concentrated sulphuric acid.
(i) The property used to prepare HCl and HNO₃ from H₂SO₄.

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Solution

(a) Sulphuric acid and hydrochloric acid are obtained by dissolving sulphur dioxide and chlorine in water.
SO₂+ 2H₂O + Cl₂ → H₂SO₄ + 2HCl
(b) The commonly used catalyst in the contact process is platinum or vanadium pentaoxide. Because platinum is more costly, vanadium pentaoxide is preferred.
(c) Oleum (H₂S₂O₇) is obtained by dissolving sulphur trioxide in 98% sulphuric acid.
SO₃+ H₂SO₄ → H₂S₂O₇

(d) On treating zinc with dilute sulphuric acid, zinc sulphate (ZnSO₄ ) is formed.
Zn + H₂SO₄ → ZnSO₄ + H₂

(e) On treating ferrous sulphide with dilute sulphuric acid, ferrous sulphate and hydrogen sulphide are formed.
FeS + H₂SO₄ → FeSO₄ + H₂S

(f) On treating aqueous lead nitrate with dilute sulphuric acid, an insoluble lead sulphate is obtained as the precipitate.
Pb(NO₃)₂+ H₂SO₄ → PbSO₄↓ + 2HNO₃

(g) On treating aqueous barium chloride with dilute sulphuric acid, barium sulphate is obtained as the precipitate.
BaCl₂+ H₂SO₄ → BaSO₄↓ + 2HCl

(h) On treating carbon with hot concentrated sulphuric acid, carbon dioxide and sulphur dioxide are formed.
C + 2H₂SO₄ → 2H₂O + 2SO₂ + CO₂

(i) The non-volatile property of concentrated sulphuric acid is used to prepare HCl and HNO₃ from H₂SO₄_.
KCl + conc.H2SO4 →<2000C KHSO4 + HClKNO3 + conc.H2SO4 →<2000C KHSO4 + HNO3

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Name the following:
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(ii) Drying agent used to dry hydrogen chloride.
(iii) Salt obtained by heating sodium chloride with concentrated sulphuric acid below 200 degree celsius.
(iv) Gas that yields dense white fumes when mixed with hydrogen chloride.
(v) Two solution that yield white precipitates, when treated with hydrogen chloride or hydrochloric acid.
(vi) Gas obtained by treating metals with hydrochloric acid.
(vii) Gas obtained by treating ferrous sulphide with hydrochloric acid.
(viii) Five oxidizing agents that liberate chlorine from concentrated hydrochloric acid.
(ix) Acid used to extract glue from bones.
(x) A chloride which is soluble in excess of ammonium hydroxide.
(xi) A greenish yellow gas.
(xii) A chemical in which gold can be dissolved.
(xiii) A metallic oxide which reacts with hydrochloric acid to give a coloured solution.
(xiv) Two colourless gases which when mixed produce a white solid.

Q. The sulphur dioxide obtained by the combustion of

8

g of sulphur is passed into bromine water. The solution is then treated with barium chloride. The amount of barium sulphate formed is:

Q. A white precipitate can be obtained by adding dilute sulphuric acid to:
(a) CuSO₄ solution
(b) NaCl solution
(c) BaCl₂ solution
(d) Na₂SO₄ solution

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