Required Practicals & Common Tests (with Exam Tips)

Question 1

What is the gas test for Hydrogen (H₂)?

Answer 1

Lighted splint → squeaky pop

Question 2

What is the gas test for Oxygen (O₂)?

Answer 2

Glowing splint → relights

Question 3

What is the gas test for Carbon dioxide (CO₂)?

Answer 3

Bubble through limewater → turns milky/cloudy

Question 4

What is the gas test for Chlorine (Cl₂)?

Answer 4

Damp blue litmus paper → turns white (bleached)

Question 5

What is the flame test result for Lithium (Li⁺)?

Answer 5

Crimson red flame

Question 6

What is the flame test result for Sodium (Na⁺)?

Answer 6

Yellow/orange flame

Question 7

What is the flame test result for Potassium (K⁺)?

Answer 7

Lilac/purple flame

Question 8

What is the flame test result for Calcium (Ca²⁺)?

Answer 8

Brick red/orange-red flame

Question 9

What is the flame test result for Copper (Cu²⁺)?

Answer 9

Green flame

Question 10

What is the precipitate test result for Copper (Cu²⁺) using NaOH?

Answer 10

Blue precipitate

Question 11

What is the precipitate test result for Iron(II) (Fe²⁺) using NaOH?

Answer 11

Green precipitate

Question 12

What is the precipitate test result for Iron(III) (Fe³⁺) using NaOH?

Answer 12

Brown precipitate

Question 13

What is the test for Ammonium (NH₄⁺) using NaOH?

Answer 13

Add NaOH, gently heat → ammonia gas turns damp red litmus paper blue

Question 14

What is the test for Sulfate ions (SO₄²⁻)?

Answer 14

Add HCl, then barium chloride → white precipitate

Question 15

What is the test for Carbonate ions (CO₃²⁻)?

Answer 15

Add dilute acid → fizzing → CO₂ gas → turns limewater cloudy

Question 16

What is the test for Chloride ions (Cl⁻)?

Answer 16

Add nitric acid, then silver nitrate → white precipitate

Question 17

What is the test for Bromide ions (Br⁻)?

Answer 17

Add nitric acid, then silver nitrate → cream precipitate

Question 18

What is the test for Iodide ions (I⁻)?

Answer 18

Add nitric acid, then silver nitrate → yellow precipitate