The acid in butter is called ________ acid

• A) Butanonoic
• B) Butyric
• C) Benzoic
• D) Butandioic

(a) Outline the procedures for the treatment of water for town supply.

(b) (i) Statetwo main impurities present in bauxite.

(ii) Giveone reason why bauxite is usually preferred as the ore for the extraction of aluminium.

(iii) Outline the manufacture of aluminium form purified bauxite.

(c) (i) Explainbriefly the termfine chemical industry.

(ii) Statetwo differences between afine chemical and a heavy chemical.

(d) (i) Write a balanced chemical equation for the combustion of coal.

(ii) If 5.4 g of coal is burnt completely, calculate the amount of oxygen measured at s.t.p. that would be required for the combustion.

[C = 12.0, O = 16.0, Molar volume of a gas at s.t.p. = 22.4 dm\(^3\)]

(e) Nametwo substances which can be used as electrodes during the electrolysis of acidified water.

Salts that contain water of crystallization are said to be

• A. anhydrous
• B. deliquescent
• C. efflorescent
• D. hydrated

Which of the following salts can be prepared by reacting the metal with dilute H₄SO₄?

• A. CuSO₄
• B. MgSO₄
• C. BaSO₄
• D. PbSO₄

Which of the following statements is TRUE of the complete hydrolysis of a glycerine by sodium hygroxide?

• A. 3 moles ofNaOH are required for each mole of glyceride
• B. 3 moles of glycerol are produced
• C. Only one mole of soap is formed
• D. concentrated H2SO4 is essential for the completion of the reaction

The equilibrium constant, Kc for the reaction, \(NO_{(g)} + \frac{1}{2}O_{2(g)} \rightarrow NO_{2(g)}\), is 35.2. What is the value of K for the reaction, \(NO_{2(g)} \rightarrow NO_{(g)} + \frac{1}{2}O_{2(g)}\)

• A) 35.2
• B) 17.6
• C) 2.84
• D) 1.24

The pressure exerted by a gas is a function of the

• A. total volume of the gas
• B. speed of the gaseous molecules
• C. mass of each gaseous molecule
• D. frequency of collision between gaseous molecules

CuO(s) + H2(g) ↔ Cu(s) + H2O(l) What is the effect of increasing the pressure on the equilibrium reaction above?

• A) The equilibrium is shifted to the left
• B) The equilibrium is shifted to the right
• C) There is no effect
• D) More H2(g) is produced

Sodium chloride is used in the following processes except in the

• A. treatment of polluted water
• B. preservation of food
• C. separation of soap from glycerol
• D. manufacture of chlorine

Halogens generally react with metals to form

• A. alkalis
• B. acids
• C. bases
• D. salts