Testing for Anions

I change potassium dichromate paper from orange to green-blue. I am a ___.

• chloride ion

• nitrate ion

• sulfate ion

• sulfite ion

When silver nitrate is added to substance A, a cream precipitate forms. Which ion is present?

• nitrate ion

• bromide ion

• iodide ion

• chloride ion

When aqueous ammonia is added to the cream precipitate which formed, what happens?

• the ppt dissolves quickly

• the ppt dissolves slowly

• the ppt does not dissolve

• the ppt changes colour

Lead(ii) nitrate forms a ____ ppt when the iodide ion is present.

• yellow

• cream

• white

• blue

When testing for carbonates, what gas is evolved upon addition of an acid?

• nitrogen dioxide

• oxygen

• hydrogen

• carbon dioxide

When a sulfite is present, it changes it changes potassium manganate(VII) from purple to ___.

• pink

• light purple

• colourless

Barium chloride is used to detect my presence. I am a ___.

• sulfite ion

• sulfate ion

• nitrate ion

• bromide ion

Sodium hydroxide solution and aluminium powder are added to substance B and the solution is warmed. If ammonia gas evolves which ion is present?

• sulfate ion

• nitrite ion

• nitrate ion

• sulfite ion