Gas and Ion Tests Quiz

Which gas turns damp red litmus paper blue?

• Carbon dioxide

• Hydrogen

• Ammonia

• Oxygen

What is the positive test for hydrogen gas?

• It turns limewater milky.

• It pops with a lit splint.

• It bleaches damp litmus paper.

• It re-lights a glowing splint.

A glowing splint is placed into a test tube of gas and it re-lights. Which gas is present?

• Oxygen

• Carbon dioxide

• Hydrogen

• Chlorine

Limewater turning milky (cloudy) indicates the presence of which gas?

• Hydrogen

• Ammonia

• Chlorine

• Carbon dioxide

Which gas can bleach damp blue litmus paper, turning it white?

• Hydrogen

• Chlorine

• Oxygen

• Ammonia

When adding dilute hydrochloric acid to a solid sample, bubbles of gas are produced and the gas turns limewater milky. What ion was present in the solid?

• Chloride (Cl⁻)

• Sulfate (SO₄²⁻)

• Carbonate (CO₃²⁻)

• Nitrate (NO₃⁻)

A solution is tested with barium chloride solution and dilute hydrochloric acid. A white precipitate that remains after adding HCl indicates the presence of which ion?

• Chloride (Cl⁻)

• Sulfate (SO₄²⁻)

• Carbonate (CO₃²⁻)

• Bromide (Br⁻)

When testing for halide ions with silver nitrate solution and nitric acid, a cream precipitate suggests the presence of which ion?

• Chloride (Cl⁻)

• Bromide (Br⁻)

• Iodide (I⁻)

• Sulfate (SO₄²⁻)

A solution gives a yellow precipitate upon addition of silver nitrate and nitric acid. Which halide ion is present?

• Chloride (Cl⁻)

• Bromide (Br⁻)

• Iodide (I⁻)

• Fluoride (F⁻)

A green flame test result suggests the presence of which metal ion?

• Sodium

• Lithium

• Potassium

• Copper