Which of the additives could improve the quality of steel?

• A. Silicon
• B. Sulphur and phosphorus
• C. Carbon
• D. Chromium and nickel

Sodium hydroxide is prepared commercially from sodium chloride solution by?

• A. electrolysis using mercury as cathode
• B. hydrolysis in steam using a catalyst
• C. electrolysis using iron as anode
• D. treating sodium chloride with ammonia and carbon (IV) oxide

The electron configuration of two elements with similar chemical properties are represented by?

• A. 1s22s22p5 and 1s22s22p4
• B. 1s22s22p4 and 1s22s22p63s1
• C. 1s22s22p63s1 and 1s22s1
• D. 1s22s22p4 and 1s22s1

An undesirable paraffin in the petroleum industry which is particularly prone to knocking is?

• A. iso-octane
• B. n-heptane
• C. iso-heptane
• D. n-octane

2.85g of an oxide of copper gave 2.52g of copper on reduction and 1.90g of another oxide gave 1.52g of copper on reduction. The data above illustrates the law of?

• A. constant composition
• B. conservation of mass
• C. reciprocal proportions
• D. multiple proportions

Synthetic rubber obtained by the polymerization of chlorobutadiene in the presence of sodium is called?

• A. teflon
• B. isoprene
• C. polythene
• D. neoprene

One method of driving the position of equilibrium of an endothermic reaction forward is to?

• A. increase temperature at constant pressure
• B. dcrease pressure at constant temperature
• C. cool down the apparatus with water
• D. decreases temperature at constant pressure

Which of the following gases is the most dangerous pollutant?

• A. Hydrogen sulphide
• B. Carbon (lV) oxide
• C. Sulphur (lV) oxide
• D. Carbon (ll) oxide

The reaction of an alkanol with an alkanoic acid in the presence of concentrated H2SO4 will produce an?

• A. alkanal
• B. alkanoate
• C. alkanone
• D. alkyne

When platinum electrodes are used during the electrolysis of copper (ll) tetraoxosulphate (lV) solution, the solution gets progressively?

• A. acidic
• B. basic
• C. neutral
• D. amphoteric