Question

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

1. P is white solid. When heated produces white fumes (sublime).
2. P and R on warming produce an alkaline gas.
3. On adding water to T, heat is evolved and R is formed.
4. Q burns brightly in the air to form T.
5. When S is heated, it gives off brown fumes and leaves a black residue of U.
6. A solution of S is formed by warming U with dilute nitric acid.
7. V is a gaseous non-metallic element that reacts with hydrogen to form W.
8. A solution of W will neutralize the solution of R.

Answer 1

1. P is Ammonium Chloride (NH₄Cl).
2. P is Ammonium Chloride (NH₄Cl) and R is Calcium Hydroxide [Ca(OH)₂].
3. T is CaO and R is Ca(OH)₂.
4. Q is Ca (Calcium) and T is CaO.
5. S is Copper (II) Nitrate and U is CuO (Copper oxide).
6. S is Cu[NO₃] and U is CuO.
7. V is Chlorine (Cl₂) and W is HCl (Hydrogen Chloride).
8. W is HCl and R is Calcium hydroxide.