Name the following:
(i) Gas produced in air during lightning.
(ii) Gas obtained by treating manganese with 1% nitric acid.
(iii) Salt referred to as Chile saltpetre.
(iv) Salt used in the laboratory to prepare nitric acid.
(v) Products obtained by the catalytic oxidation of ammonia.
(vi) Products obtained by heating concentrated nitric acid.
(vii) Two coloured nitrates.

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Solution

(i) Nitrogen
(ii) Hydrogen
(iii) Sodium nitrate
(iv) Sodium nitrate
(v) Nitrogen dioxide
(vi) Water and nitrogen dioxide (brown fumes)
(vii) Copper nitrate and iron nitrate

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Q. Name the following:
(i) Gas obtained by treating chlorine in excess of ammonia.
(ii) Solid obtained by passing ammonia over heated copper oxide.
(iii) Products obtained by burning ammonia in oxygen.
(iv) Substance used to dry ammonia.
(v) Liquid when added to metallic nitride that yield ammonia.
(vi) Indicator that turns deep pink when treated with NH₄OH.
(vii) Products obtained by treating ammonia with excess chlorine.
(viii) Basic gas that is used as a refrigerant.
(ix) Solution used to remove fat grease.
(x) Salt known as ammoniac.
(xi) Salt used to clean metal surfaces before soldering, tinning, etc.
(xii) Ammonium salt used in explosive.
(xiii) An acidic gas which reacts with a basic gas liberating neutral gas.
(xiv) A nitride of divalent metal which reacts with hot water producing ammonia.

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.

Nitric acid obtained in the laboratory is slightly yellow. The yellow colour of the acid is removed by addition of excess of oxygen gas.

Q. What are the products obtained when concentrated nitric acid is treated with copper turnings?

Q. How does nitric acid react with metals? Why is

H_{2}

gas not obtained as one of the products during the reaction? [5 MARKS]

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(i) Nitrogen (ii) Hydrogen (iii) Sodium nitrate (iv) Sodium nitrate (v) Nitrogen dioxide (vi) Water and nitrogen dioxide (brown fumes) (vii) Copper nitrate and iron nitrate

(i) Nitrogen
(ii) Hydrogen
(iii) Sodium nitrate
(iv) Sodium nitrate
(v) Nitrogen dioxide
(vi) Water and nitrogen dioxide (brown fumes)
(vii) Copper nitrate and iron nitrate