Chemistry
Use the information given in (a) to (h) to identify the substances P to W selecting your answers from the given list.
| List | ||
|---|---|---|
| Calcium | Oxygen | Copper (II) oxide |
| Carbon | Calcium hydroxide | Copper (II) nitrate |
| Lead (II) oxide | Hydrogen chloride | Chlorine |
| Lead (II) nitrate | Calcium oxide | Ammonium chloride |
(a) P is a white solid. When heated produces white fumes (sublime).
(b) P and R on warming produce an alkaline gas.
(c) On adding water to T, heat is evolved and R is formed.
(d) Q burns brightly in air to form T.
(e) When S is heated, it gives off brown fumes and leaves a black residue of U.
(f) A solution of S is formed by warming U with dilute nitric acid.
(g) V is a gaseous non-metallic element that reacts with hydrogen to form W.
(h) A solution of W will neutralise the solution of R.
Practical Chemistry
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Answer
(P) Ammonium chloride
(Q) Calcium
(R) Calcium hydroxide
(S) Lead (II) Nitrate
(T) Calcium Oxide
(U) Lead (II) Oxide
(V) Chlorine
(W) Hydrogen chloride
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From the following list of substances choose those which meet the description given below.
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- Ammonium nitrate
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- Iron
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- Silver nitrate
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Two compounds whose aqueous solutions give white precipitates with dilute hydrochloric acid.
Copy and complete the following table which refers to the action of heat on some carbonates :
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Aqueous salt solution Colour of precipitate when NaOH is added in a small quantity Nature of precipitate (soluble or insoluble) when NaOH is added in excess Copper (II) sulphate (i) (vi) Zinc nitrate (ii) (vii) Lead nitrate (iii) (viii) Calcium chloride (iv) (ix) Iron (III) sulphate (v) (x)