Test for Gases [Ms Paik]

What gas is produced when dilute hydrochloric acid reacts with a metal?

• Nitrogen gas

• Carbon dioxide

• Oxygen gas

• Hydrogen gas

How can you test for the presence of oxygen gas?

• Lighted splint extinguishes with a 'pop' sound

• Lighted splint relights

• Glowing splint relights

• Glowing splint extinguishes with a 'pop' sound

Which gas forms white precipitate in lime water when passed through it?

• Nitrogen

• Hydrogen

• Oxygen

• Carbon dioxide

What is the expected color change of litmus paper when exposed to chlorine gas, Cl₂? [Multi-select]

• damp red litmus paper remained red, bleached white

• blue litmus paper turned red

• damp blue litmus paper turned red, bleached white

• damp red litmus paper turned blue, bleached white

How can you identify the presence of ammonia gas?

• Damp red litmus paper turned blue

• Damp blue litmus paper turned red

• red litmus paper turned blue

• blue litmus paper turned red

Which reaction leads to the formation of NH₃ gas?

• NH₄NO₃ + NaCl

• NH₃ + H₂O

• NH₄Cl + HCl

• NH₄Cl + NaOH

How can you test for the presence of carbon dioxide gas?

• Bubble the gas through lime juice (squeeze lime in water)

• Bubble the gas through quicklime (calcium oxide)

• Bubble the gas through limewater (calcium hydroxide)

• Bubble the gas through limestone (calcium carbonate)

Which reaction will lead to the production of carbon dioxide gas?

• HCl + Mg₂CO₃

• HNO₃ + MgCO₃

• NaOH + ZnCO₃

• KOH + ZnCO₂

What are the observations for the test of sulfur dioxide gas?

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Answer explanation

Gas produced

decolourises the acidified purple

KMnO4 solution OR turns the

acidified purple KMnO4 solution

colourless.

Sulfur dioxide (SO2) is evolved.