4G QA Anion Quiz

A label is missing from a bottle of a yellow solution Q.

In order to identify the solution two simple chemical tests are carried out.

test 1 – A few drops of aqueoues sodium hydroxide are added to a sample of Q. A red-brown precipitate is formed.

test 2 – Aqueous sodium hydroxide and aluminium are added to another sample of Q and warmed. A pungent gas, which turns damp red litmus paper blue, is produced.

• iron (II) nitrate

• iron (III) nitrate

• iron (II) sulfate

• iron (III) sulfate

A salt, W, on warming with excess aqueous sodium hydroxide, evolved a gas that turned damp red litmus paper blue. When no more gas was evolved, aluminium powder was added and a further evolution of the same gas occured.

What was Q?

• (NH4)2CO3

• NH4Cl

• (NH4)2SO4

• NH4NO3

What is the identity of the precipitate formed when copper (II) chloride reacts with acidified silver nitrate?

• AgCl

• AgBr

• CuCl2

• Cu(OH)2

An aqeuous solution of an iron (II) compound T, undergoes the following reaction:

T + nitric acid + aqueous silver nitrate → yellow precipitate

What is T?

• iron (II) carbonate

• iron (II) chloride

• iron (II) iodide

• iron (II) nitrate

What is the observation when HCl (aq) is added to carbonate?

• Colourless, pungent gas evolved turns damp red litmus paper blue.

• White ppt

• Colourless, pungent gas evolved turned purple acidified potassium manganate (VII) colourless.

• Effervescence observed. Colourless, odourless gas evolved gives white ppt. in limewater.

When J is mixed with acidified aqueous barium nitrate, a white precipitate K forms.

The identity of K is _____

Name K.