A filtration is used to remove sand from a mixture of water, salt and sand. What will be in the filtrate?

• a mixture of an element and a compound

• a mixture of two compounds

• one compound only

• one element only

Which types of substance do the chemical symbols C, CO₂ and O₂ represent?

• C: compound, CO₂: compound, O₂: element

• C: compound, CO₂: element, O₂: compound

• C: element, CO₂: compound, O₂: element

• C: element, CO₂: element, O₂: compound

Which element forms an ionic compound with a sodium?

• Magnesium

• Chlorine

• Helium

• Potassium

Electrolysis is used separate lead(II) bromide. Lead is formed at cathode. Which statement about the electrolysis is correct?

• A green gas is given off at anode

• Anode is connected to negative end of the battery

• Only a physical change takes place when a current is passed

• The electrolyte is in the molten state

What happens during all endothermic changes?

• A gas is produced

• Solids melt

• The temperature decreases

• There is a colour change

Which statement describes a redox reaction?

• An acid reacts with a base

• Only oxidation takes place

• Oxygen is transferred from one substance to another

• Two substances are both reduced

Dilute hydrochloric acid is added to solid X.

Hydrogen gas is produced.

What is X?

• zinc

• zinc carbonate

• zinc hydroxide

• zinc oxide

Which test is used to identify ammonia?

• A glowing splint relights

• Damp blue litmus paper is bleached

• Damp red litmus paper turns blue

• Limewater turns milky

A soft metal reacts vigorously with cold water. What is the position of this metal in the Periodic Table?

• A

• B

• C

• D

Which statement describes a transition element?

• a metal that forms white compounds

• a metal with a high melting point

• a metal with a low density

• a non-metal that forms coloured compounds