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 NH₄Cl Ammonium Chloride.
2. P is NH₄Cl Ammonium Chloride and R is Ca(OH)₂ Calcium Hydroxide.
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