The oxide from electric power station is

• A. carbon (IV) oxide
• B. copper (ll) oxide
• C. nitrogen (IV) oxide
• D. sulphur (IV) oxide

Can hydrogen be used to reduce the oxide of Na?

• A) No
• B) partial
• C) Yes
• D) insufficient

An experiment produces a gaseous mixtures of carbon (IV) oxide and carbon (II) oxide. In order to obtain pure carbon (II) oxide, the gas mixture should be?

• A. passed over heated copper (II) oxide
• B. bubbled through concentrated tetraoxosulphate (IV) acid
• C. bubbled through sodium hydroxide solution
• D. bubbled through water

Which of the following metals is common to both brass and bronze?

• A. Aluminium
• B. Copper
• C. Lead
• D. Iron

Which of the following bonds exist in crystalline ammonium chloride (Ni₄Cl)?

• A) ionic and covalent
• B) ionic and co-ordinate
• C) ionic covalent and co-ordinate
• D) covalent, co-ordinate and metallic

A quantity of air was passed through a weighed amount of alkaline pyrogallol. An increase in the weight of the pyrogallol would result from the absorption of?

• A. nitrogen
• B. neon
• C. argon
• D. oxygen

The following metals are extracted by the electrolytic method except

• A. potassium
• B. calcium
• C. sodium
• D. tin

Which of the following compounds dissolves readily in water?

• A. BaSO₄
• B. CuSO₃
• C. NH₄CI
• D. AgCI

120 cm\(^3\) of hydrogen were sparked with 60cm\(^3\) of oxygen at 110°C. What was the volume of steam produced? The equation for the reaction is 2H\(_{2(g)}\) + O\(_{2(g)} \rightarrow\) 2H\(_2\)O\(_{(g)}\)

• A)
  30cm\(^3\)
• B)
  60cm\(^3\)
• C)
  90cm\(^3\)
• D)
  120cm\(^3\)

Which of the following decreases when a given mass of gas is compressed to half its initial volume?

• A. Average intermolecular distance
• B. Frequency of collisions
• C. Number of molecules present
• D. Atomic radius of each particle