QA revision (created by you!)

How to test for hydrogen?

• Place lighted split at mouth of test tube/ near gas

• Bubble gas through limewater

• Place a glowing split at mouth of test tube/ near gas

• Place damp litmus paper near gas

Which substance reacts with HCl to form a colourless solution?

• calcium carbonate

• iron (II) hydroxide

• copper (II) oxide

• iron (III) hydroxide

Which ion does not produce ppt when aq ammonia is added?

• calcium

• copper (II)

• iron (II)

• zinc

A solid is insoluble in water and aqueous alkali, but it is soluble in acid with no gas evolved. Which could be the solid?

Which, when aq ammonia is added, produces a precipitate that is soluble in excess?

• Copper(II) sulfate

• Iron(II) chloride

• Potassium hydroxide

• Zinc Chloride

Which ion gives a white precipitate when reacted with aqueous ammonia in excess?

• Fe²⁺

• Zn²⁺

• Pb²⁺

• Ca²⁺

A solid is insoluble in water but dissolves in aqueous acid without evolution of gas.

• Calcium Carbonate

• Potassium Carbonate

• Sodium Hydroxide

• Zinc Hydroxide

Which gas is evolved when an alkaline solution of sodium nitrate is warmed with aluminium?

• Ammonia

• Nitrogen

• Nitrogen dioxide

• Oxygen

When aqueous sodium hydroxide is added to a solution, a white precipitate forms which dissolves when more sodium hydroxide is added. Which ion is present in this solution?

• calcium

• copper(II)

• sodium

• lead(II)

Green ppt that is insoluble in excess is observed when i add aqueous sodium hydroxide. Which cation is present in this solution?

• Aluminium

• Copper(II)

• Iron(II)

• Iron(III)