Group VII Properties (Cambridge (CIE) O Level Chemistry): Exam Questions

The table shows the density of three halogens at room temperature and pressure.

Astatine is below iodine in Group VII.

Which is the most likely density of astatine?

Astatine is a radioactive Group VII element which is extremely unstable, making it difficult to study. The physical and chemical properties of astatine can only be estimated.

Which row most likely describes the properties of astatine?

X, Y and Z are the halogens chlorine, bromine and iodine, but not necessarily in that order.

When aqueous Y is added to an aqueous solution containing ions of Z, a brown solution is formed. When aqueous X is added to an aqueous solution containing ions of Z, no reaction occurs

Which row correctly identifies halogens X, Y and Z?

Aqueous chlorine is added to aqueous potassium bromide and a reaction occurs.

Which ionic equation represents this reaction?

These statements are about the halogens chlorine, bromine and iodine.

1 They are diatomic non-metals.

2 Their density increases from chlorine to iodine.

3 Their reactivity increases from chlorine to iodine.

Which statements are correct?

Element Q is a halogen which reacts with aqueous potassium bromide, as shown in the reaction below:

Q₂ + 2KBr → 2KQ + Br₂

Which row describes element Q?

A solution of a lithium halide is mixed with a halogen. A reaction occurs and the mixture darkens in colour.

What is the mixture?

Astatine, At, lies below iodine in Group VII of the Periodic Table.

Which reaction occurs?

A student adds a halogen solution to a halide solution and records whether a reaction occurs.

The student records four results.

One of the recorded results must be incorrect.

Which result must be incorrect?

These statements are about the reactions of the halogens.

1 Chlorine displaces bromine from aqueous potassium bromide.

2 Bromine displaces chlorine from aqueous potassium chloride.

3 Both of these reactions produce a colour change.

Which statements are correct?