Safety matches contain sulphur and?

• A. potassium trioxochlorate (V)
• B. potassium trioxonitrate (V)
• C. charcoal
• D. phosphorus sulphide

What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na = 23, O =16, H = 1]

• A) 0.40 moldm^−3
• B) 0.50 moldm^−3
• C) 0.05 moldm^-3
• D) 0.30 moldm^−3

The bleaching action of chlorine is through the process?

• A. Hydration
• B. Hydrolysis
• C. Reduction
• D. Oxidation

The decomposition of hydrogen peroxide is represented by the equation: 2H₂O(l) + O₂(g) what mass of hydrogen peroxide would be required to produce 22.4dm³of oxygen at s.t.p? (H = 1, O = 16, molar volume of a gas at s.t.p. = 22.4dm³)

• A. 18 g
• B. 34 g
• C. 36 g
• D. 68 g

Which of the following solutions will give a precipitate with dilute tetraoxosulphate (V) acid? l. Lead (ll) trioxonitrate (V) solution ll. Barium chloride solution lll. Sodium chloride solution

• A. l only
• B. ll only
• C. l and ll only
• D. ll and lll only

Iron galvanized with zinc is cathodically protected from corrosion. This is because?

• A. zinc has a more positive oxidation potential than iron
• B. zinc has less positive oxidation potential than iron
• C. bith have the same oxidation potential
• D. zinc is harder than iron

(a)i. State two conditions used in the Haber process

ii. Explain briefly the effect of increasing the pressure on the rate of reaction in the Haber process.

(b)i. A mixture of nitrogen(IV) oxide and oxygen is bubbled into warm water to produce

trioxonitrate(V) oxide, write a balanced chemical equation for the reaction.

ii. Using a balanced chemical equation only, explain what would happen if nitrogen(IV) oxide is bubbled into warm water.

iii.

Compare the gases evolved when trioxonitrate(V) acid decomposes under each of the following properties:

i. pH

ii. Solubility in water

iii. Reaction with carbon(II) oxide

(c)i. Name two oxides of sulphur

ii. Write a balanced equation for the reaction between each of the named oxides(Sulphur(IV) oxide, Sulphur (VI) oxide) and water

(d)i. Name one calcium compound

a, Used to dry ammonia gas

b. Used in the manufacture of cement

c. That causes hardness in water

d. Name one calcium compound

The halogen which is chiefly produced commercially from sea water is _______

• A) Fluorine
• B) chlorine
• C) Bromine
• D) iodine

The presence of unpaired electrons in an atom of a transition metal gives rise to

• A. paramagnetism
• B. nalleability
• C. ductility
• D. shiny appearance

On which of the following is the solubility of a gaseous substance dependent? I. Nature of solvent II. Nature of solute III. Temperature IV. Pressure

• A) I, II, III and IV
• B) I and II only
• C) II only
• D) I, III and IV only