Pitch and asphall are residual products from the fractional distillation of petroleum These sub-stances are used as ?

• A. protective coatings for road surfaces
• B. binding agents for roofing materials
• C. organic solvents
• D. catalysts for cracking

(a)(i) Define polymerization.

(ii) Mention two types of polymerization.

(iii) Give one example of I. naturally occurring polymer, II. synthetic polymer.

(b)(i) Describe how ethyne could be prepared in the laboratory.

(ii) Write an equation for the I. polymerization of ethyne II. complete reaction of ethyne with hydrogen bromide.

(iii) Name each of the products formed in (b)(ii) II.

(c)(i) Define each of the following terms: I. pollution; Il. pollutant.

(ii) Mention three types of pollution.

(iii) Give two ways by which pollution can be prevented.

The carbon atoms on ethane are

• A) sp²hybridized
• B) sp³hybridized
• C)sp⁴ hybridized
• D) sp hybridized

The gasification of coke is used for the manufacture of

• A) producer gas
• B) natural gas
• C) synthetic gas
• D) industrial gas

Water can be obtained as the only product during

• A) combustion of hydrocarbons
• B) neutralization of an acid by base
• C) combustion of hydrogen
• D) electrolysis of brine

Which of the following processes leads to increase in entropy?

• A. Mixing a sample of NaCl and sand
• B. Condensation of water vapour
• C. Boiling a sample of water
• D. Cooling a saturated solution

A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that

• A) collisions are perfectly elastic
• B) forces of repulsion exist
• C) forces of repulsion and attraction are in equilibrium
• D) collisions are inelastic

copper can best be purified by

• A. roasting the impure copper in black furnace
• B. Heating the oxide with coke
• C. electrolyzing a copper (II) salt solution using the impure copper as the anode
• D. converting the impure copper to trioxonitrate

The atoms of four elements are represented as₂₀Q,₁₆R,₁₀S and₈T Which of the elements would be unreactive?

• A. Q
• B. R
• C. S
• D. T

What volume of 0.750moldm^-3 Na₂CO₃ solution could be diluted to 250cm³ to reduce the concentration of 0.025moldm³?

• A) 16.8 cm³
• B) 14.2 cm³
• C) 10.4 cm³
• D) 8.3 cm³