12(a) Reactivity series & Metals

Hydrogen gas will reduce

• calcium oxide

• silver oxide

• magnesium oxide

• potassium oxide

Which element is always present with iron in mild steel?

• aluminium

• carbon

• chromium

• nickel

Which substances removes impurities from iron ore in the blast furnace?

• carbon

• limestone

• sand

• slag

which metal can be extracted by heating an ore containing its oxide with carbon?

• calcium

• magnesium

• iron

• potassium

Which metal, attached to an iron pipe immersed in seawater, would prevent rusting of the iron?

• copper

• lead

• magnesium

• silver

Scrap iron is often recycled.

Which reason for recycling is not correct?

• It reduces yhe amount of pollution at the site of the ore extraction.

• It reduces the amount of waste taken to land-fill sites,

• It reduces the need to collect the scrap iron.

• it saves natural resources.

When zinc foil is placed in an aquaoeus solution containing both magnesium chloride and copper(II) sulfate, which element is displaced?

• chlorine

• copper

• hydrogen

• magnesium

Which pair of reagents can be used to prepare hydrogen?

• copper and dilute hydrochloric acid

• copper and dilute sulfuric acid

• zinc and dilute hydrochloric acid

• zinc and water

What reacts with hydrochloric acid to give hydrogen?

• ammonia

• iron

• silver

• sodium hydroxide

Which metal should be used in the sacrificial protection of the hull of a boat made from iron?

• calcium

• copper

• lead

• zinc