Tests for ions and gases

Which of the following is used to test for nitrate ions?

• aluminum solid, dilute sulphuric acid and concentrated sulphuric acid

• Hydrochloric acid and barium chloride solution

• Nitric acid and silver nitrate solution

• Sodium hydroxide solution

NaOH is added to an unknown solution. A blue ppt forms. The formula of the ion is:

• Fe
• Fe3+
• Fe2+
• Cu2+

NaOH is added to an unknown solution. A brown precipitate forms. The formula of the ion is:

• Fe2+

• Fe3+

• Cu2+

• Cl-

NaOH is added to an unknown solution. A green precipitate forms. The formula of the ion is:

• Fe2+

• Fe3+

• Cu2+

• Na+

How do you test for carbon dioxide gas?

• Turns limewater cloudy

• Relights a glowing splint

• Makes a squeaky pop with a splint

• Bleaches damp litmus paper

How do you test for Chlorine gas?

• Bleaches damp litmus paper
• Makes a squeaky pop with a lit splint
• Relights a glowing splint
• Turns limewater milky

Dilute hydrochloric acid is added to a colourless solution. Bubbles appear immediately and this gas turns limewater cloudy. What ion was present in the solution?

• Carbonate

• Sulfate

• Nitrate

• Chloride

Test for sulphate ions is...

• Add acid or barium chloride

• Add barium chloride or barium nitrate

• Add silver nitrate or barium nitrate

• Add barium chloride or silver nitrate

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

All of the following salts are soluble except...

• Lead(II) nitrate
• Sodium carbonate
• Magnesium chloride
• Barium sulphate