How many structural isomers can be drawn for the non-cyclic alkanol with molecular formula C₄H₁₀O?

• A. 1
• B. 2
• C. 3
• D. 4

Which of the following scientists discovered the electrons?

• A. Joseph J. Thompson
• B. James Chadwick
• C. Amedeo Avogadro
• D. Ernest Rutherford

(a) Give the products of electrolysis of dilute copper (II) tetraoxosulphate(VI) solution using the following materials as electrodes:

(i) carbon rod;

(ii) copper rods

(b) For each of the process in (a) above;

(i) write the anodic half reaction;

(ii) state how electrolysis affects the pH of electrolyte

The raw materials used for the smelting of iron ore in a furnace is

• A. CaSO₄
• B. CaCO₃
• C. CuSO₄
• D. Zn(NO₃)₂

Commercial bleaching can be carried out using

• A) sulphur (IV) oxide and ammonia
• B) hydrogen sulphide and chlorine
• C) chlorine and sulphur (IV) oxide
• D) ammonia and chlorine

If 10.8 g of silver is deposited in a silver coulometer volume of oxygen liberated is?

• A. 0.56 dm3
• B. 5.60 dm3
• C. 11.20 dm3
• D. 22.40 dm3

The air pollutant unknown in nature is

• A) NO
• B) CO
• C) HCHO
• D) DDT

Which of the following electron transition results in the emission of energy?

• A. 3p to 3s
• B. 3p to 4p
• C. 2s to 2p
• D. 1s to 2s

A gas exerts pressure on its container because

• A. some of its molecules are moving faster than others
• B. of the collision of the molecules with each other
• C. of the mass of the molecules of gas
• D. the molecules of a gas colide with the walls of the container

Chlorine, bromine and iodine resemble one another in that they

• A. dissolve in alkalis
• B. react violently with hydorgen without heating
• C. are liquids
• D. displace one another from solutiions of their salts