Edexcel IGCSE Chemistry Quiz

What gas turns damp red litmus paper blue?

• Carbon dioxide

• Chlorine

• Ammonia

• Hydrogen

What happens to limewater when carbon dioxide is bubbled through it?

• It turns blue

• It turns cloudy white

• It turns yellow

• It remains clear

What color does damp blue litmus paper turn in the presence of chlorine gas?

• Blue

• Yellow

• Red then bleached white

• Green

What sound is produced when hydrogen gas is ignited?

• A hissing sound

• A squeaky pop

• A loud bang

• A fizzing noise

What indicates the presence of oxygen gas during a test?

• A blue flame appears

• A loud pop is heard

• A burning splint extinguishes

• A glowing splint relights

What color flame does lithium produce in a flame test?

• Orange-red

• Yellow

• Red

• Blue-green

What color precipitate is formed when copper ions react with sodium hydroxide?

• White

• Light blue

• Green

• Brown

What is the test for carbonate ions?

• Add dilute acid and bubble through limewater

• Add sodium hydroxide

• Add barium chloride

• Add silver nitrate

What color precipitate forms when chloride ions react with silver nitrate?

• Blue

• White

• Cream

• Yellow

What is the result of adding barium chloride to a solution containing sulfate ions?

• No reaction

• A yellow solution forms

• A white precipitate forms

• A blue precipitate forms