When aqueous ammonia is added to one of the following solutions,a white precipitate which dissolved in excess ammonia is formed Identify the solution.

• A. ZnCl₂(aq)
• B. Pb(NO₃)₂(aq)
• C. CuSO₄(aq)
• D. FeSO₄(aq)

Consider the reaction represented by the equation. 2NaHCO₃(s) → 2Na₂CO₃(S) + CO 2(g) + H2O(g) what volume of carbon (IV)oxide at s.t.p is evolved when 0. 5 moles of NaHCO₃ is heated? [Molar volume = 22.4 dm³ at s.t. p]

• A. 1.12dm³
• B. 2.24dm³
• C. 5.6dm³
• D. 56.0dm³

(a)(i) State two differences betwecii the properties of solids and gases

(ii) What process does each of X, Y and Z represent in the changes shown below?

(b)(i) State Charles' Law (ii) Draw a sketch to graphically illustrate Charles' Law.

(c) 60 cm of hydrogen diffused through a porous membrane in 10 minutes. The same volume of a gas G diffused through the same membrane in 37.4 minutes. Determine the relative molecular mass of G. [ H = I ]

(d)(i) State two assumptions X of the kinetic theory.

(ii) Consider the reaction represented by the Solid of Liquid following equation:

H\(_{2(g)}\) + Cl\(_{2(g)}\) \(\to\) 2HCI\(_{(g)}\)

Use the kinetic theory to explain how the rate of formation of HCI\(_{(g)}\) would be affected by I. increase in temperature; II. decrease in pressure.

(e) Given different examples, mention one metal in each case vihich produces hydrogen on reacting with (i) dilute mineral acid; (ii) cold water; (iii) steam; (iv) hot, concentrated alkali.

In the reaction represented by the equation. 5Fe²⁺ (aq) + MnO^4-(aq) + 8H⁺ (aq) → 5Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O(l) which species is reduced?

• A. Fe²⁺
• B. MnO^4-
• C. H⁺
• D. Fe³⁺

The ammonium compound used in the manufacture of dry cells is

• A. NH₄NO₃
• B. (NH₄)SO₄
• C. NHCCI₄
• D. (NH₄)₂CO₃

(a)(i) Draw and label a diagram to illustrate the preparation and collection of dry chlorine gas in the laboratory.

(ii) List two uses of chlorine.

(b)(i) Explain why river water flowing through an industrial town may be unsafe for drinking.

(ii) State the use of each of the following substances in water treatment: I. Sand, II. Chlorine, III. Calcium oxide, IV. Alum

(c)Consider the reaction represented by the following equation:

2Na\(_2\)CI\(_{(s)}\) + H\(_2\)SO\(_{4(aq)}\) \(\to\) Na\(_2\)SO\(_{4(aq)}\) + 2HCI\(_{(g)}\)

Calculate the volume of HCI gas that can be obtained at s.t.p. from 5.85 g of sodium chloride. [H = 1, Na = 23, CI = 35.5, Molar volume a 22.4 dm\(^3\) at s.t.p]

(d) Give one example in each case of a (i) metal that is a liquid at room temperature. (ii) non-metal that is a iiquid at room temperature, (iii) gas at room temperature that is monatomic.

(e) State two differences between metals and nom metals with respect to their: (i) physical properties; (ii) chemical properties.

Which of the following compounds absorbs moisture from the atmosphere and dissolves in it?

• A. FeCI₃
• B. MgSO₄.7H₂O
• C. Na₂SO₄
• D. KCI

Which of the following compounds is an alkanoate?

• A. CH₃COOH
• B. CH₃COOCH₃
• C. CH₃CH₂OH
• D. CH₃CH₂COOH

Which of the following industrial processes is chlorines not used?

• A. Production of polyvinylchloride (PVC)
• B. Manufacturing of hydrochloric acid
• C. Manufacturing of common salt
• D. Manufacturing of domestic bleach

What is CaHb in the following equation? C a H b + 5O2 → 3CO 2 + 4H2O

• A. C₃H₄
• B. C₃H₆
• C. C₃H₈
• D. C₅H₁₀