0620_s21_qp_12

Iron from a blast furnace is treated with oxygen and with calcium oxide to make steel. Which substances in the iron are removed?

• A

• B

• C

• D

Cobalt, manganese and chromium are all metals.

● Cobalt(II) oxide reacts with carbon to form cobalt metal.

● Manganese(II) oxide does not react with carbon.

● Chromium(II) oxide does not react with carbon.

● Chromium does not react with water.

● Manganese reacts with water.

What is the order of reactivity of these metals?

• A

• B

• C

• D

Iron is extracted from hematite. Aluminium is extracted from bauxite. Which statements about the extraction processes are correct?

1 Both involve reduction.

2 Both take place at high temperature.

3 Both involve electrolysis.

• 1,2 and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

Which property of aluminium makes it useful for food containers?

• It conducts heat.

• It has low density.

• It is strong.

• It resists corrosion

Which substance is essential for iron nails to rust?

• carbon dioxide

• hydrogen

• nitrogen

• oxygen

Which row describes the uses of sulfur and sulfur dioxide?

• A

• B

• C

• D

Which substance is a diatomic covalent molecule found in pure dry air?

• argon

• carbon dioxide

• nitrogen

• hydrogen

The equations represent two reactions, P and Q, of lime (calcium oxide).

P CaO + SiO2 = CaSiO3

Q CaO + SO2 = CaSO3

In which processes do the reactions occur?

• A

• B

• C

• D

Which gas is the main constituent of natural gas?

• ethane

• ethene

• methane

• propane

Which compounds belong to the same homologous series?

• ethane and propane

• ethanoic acid and ethanol

• methane and ethene

• propene and ethanoic acid