Chemical Ion Tests Quiz

What is the observation when Fe²⁺ ions are tested with sodium hydroxide?

• Brown precipitate formed

• Green precipitate formed

• Light blue precipitate formed

• Forms a cream precipitate

What is the observation when Cl⁻ ions are tested with silver nitrate after acidification?

• Forms a yellow precipitate

• Forms a cream precipitate

• Forms a white precipitate

• Limewater turns cloudy

Which ion forms a cream precipitate when tested with silver nitrate after acidification?

• Cl⁻

• Br⁻

• I⁻

• SO₄²⁻

Which ion forms a white precipitate of barium sulfate when tested with barium chloride solution after acidification?

• SO₄²⁻

• CO₃²⁻

• Cl⁻

• Br⁻

Which reagent is used to test for NH₄⁺ ions?

• Silver nitrate

• Sodium hydroxide

• Barium chloride

• Hydrochloric acid

Which ion is tested by bubbling gas through limewater?

• SO₄²⁻

• CO₃²⁻

• Cl⁻

• Br⁻

What is the result of bubbling carbon dioxide through limewater?

• Limewater turns blue

• Limewater turns cloudy/milky white

• Limewater turns red

• Limewater remains clear

What is the characteristic smell of ammonia?

• Sweet

• Fruity

• Sharp and choking

• Earthy

What is the effect of chlorine gas on damp red litmus paper?

• Turns blue

• Turns red, then bleached white

• Turns green

• Remains unchanged

Which gas is identified by the re-lighting of a glowing splint?

• Carbon dioxide

• Oxygen

• Ammonia

• Chlorine