Identification of ions and gases

When an acid, X, was added to a solution containing the nitrate of metal Y, a dense white substance was precipitated.

• acid X: nitric acid; metal Y: zinc

• acid X: sulfuric acid; metal Y: barium

• acid X: hydrochloric acid; metal Y: calcium

• acid X: nitiric acid; metal Y: silver

When dilute acid was added to an unknown sample, effervescence was observed. Which anion is present?

• ammonium ion

• carbonate ion

• nitrate ion

• sulfate ion

As a gas was bubbled through limewater, this was observed. What is the identity of the gas?

• hydrogen

• ammonia

• oxygen

• carbon dioxide

A colourless pungent gas turns damp red litmus paper blue. What is the identity of the gas?

• hydrogen

• ammonia

• oxygen

• carbon dioxide

When dilute nitric acid, followed by silver nitrate solution was added to an unknown sample, a white precipitate was observed. What is the white precipitate formed?

• silver chloride

• silver carbonate

• silver nitrate

• silver sulfate

When dilute nitric acid, followed by barium nitrate solution was added to an unknown sample, a white precipitate was observed. What is the white precipitate formed?

• barium chloride

• barium carbonate

• barium nitrate

• barium sulfate

As a gas was bubbled through limewater, this was observed. What is the correct way to describe it?

• white cloudy emulsion

• white chalky solution

• white milky solution

• white precipitate formed in limewater

This is the setup to test for which gas?

• hydrogen

• ammonia

• oxygen

• carbon dioxide

Which of the following chemicals can be used to test for cations?

• Ammonium hydroxide

• Ammonium nitrate

• Sodium chloride

• Sodium hydroxide

Ammonium hydroxide is the same as

• aqueous ammonia

• ammonia solution

• NH₃ (aq)

• NH₄OH