14.8 g of a salt (z)dissolved in 250cm³ of distilled water gives a concentration of 0.80 mol/dm³. Calculate the molar mass of the salt (z).

• A. 13.5 g/mol
• B. 18.5 g/mol
• C. 47.4 g/mol
• D. 74.0 g/mol

Which of the following elements would produce coloured ions in aqueous solution?

• A. Calcium
• B. lron
• C. Magnesium
• D. Sodium

Xg of a pure sample of iron (II) sulphide reacted completely with excess dilute hydrochloric acid to give 3.20g of iron (II) chloride according to the following equation: FeS\(_{(s)}\) + 2HCI\(_{(aq)}\) ---> FeCl\(_{2(aq)}\) + H\(_2\)S\(_{(g)}\).

(a) Mention one method apart from heating by which the reaction can be made to proceed faster

(b) Calculate the value of X. [CI = 35.5, Fe = 56; FeS = 88g mol\(^{-1}\)]

Which type of salt is found in antacid medications and is used to relieve heartburn and indigestion?

• A. Aluminum chloride
• B. Magnesium chloride
• C. Sodium chloride
• D. Calcium chloride

The ability of carbon to form long chains is referred to as

• A) alkylation
• B) acylation
• C) catenation
• D) carbonation

Which of the following statements does not show Rutherford's account of Nuclear Theory? An atom contains a region

• A) which contains protons and neutrons
• B) which is positively charged
• C) which is massive and can cause deflection of a few projectiles
• D) which is very large and in which close to 98% of projectiles pass undeflected

The relative molar mass of a gaseous hydrocarbon is 30. Determine its vapour density.

• A. 45
• B. 30
• C. 15
• D. 60

The property of elements which increases down a group of the periodic table is

• A. electronegativity
• B. electron affinity
• C. ionic radius
• D. ionization energy

(a) Name the industrial process by which ethene is obtained from petroleum fractions

(b) Give the I. U. P.A.C name of the isomer whose structure is shown in the diagram below.

(c) Illustrate with an equation, one reaction in which benzene behaves as:

(i) unsaturated hydrocarbon

(ii) a saturated hydrocarbon

Equilibrium is said to be attained in a reversible reaction when

• A. all the reactants have been used up.
• B. All the products have been formed
• C. there is no further change in temperature
• D. The rates of the forward and products have been formed