O LevelChemistryCambridgeTopic Questions8. The Periodic Table8.3 Group VII Properties

Group VII Properties (Cambridge O Level Chemistry)

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11 mark

Element X is found in Group 7 of the Periodic Table. 

Which properties are typical of element X?

1 Poor conductor of electricity
2 Malleable
3 High melting points
4 Form acidic oxides

  • 1 and 2 

  • 1 and 4 

  • 2 and 3 

  • 3 and 4 

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21 mark

Astatine is found below iodine in Group 7 of the periodic table.

What is its formula and state at room temperature?

  Formula State at room temperature 
 A At gas
 B At solid
 C At2 liquid
 D At2 solid

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31 mark

Which row describes the properties of fluorine?

  colour state at r.t.p more reactive than chlorine
A yellow gas yes
B green gas no
C brown liquid no
D brown gas yes

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11 mark

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

Q2 + 2 KBr → 2 KQ + Br2

Which row describes element Q?

  More reactive than bromine Greater Ar than bromine
A ✓ ✓
B ✓ cross times
C cross times ✓
D cross times cross times

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21 mark

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

What is the mixture?

  • Bromine and lithium chloride

  • Bromine and lithium fluoride

  • Chlorine and lithium iodide

  • Chlorine and lithium fluoride

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11 mark

The reactivity of the halogens decreases moving down the group.

Which statement explains this observation?

  • Decreasing distance between the nucleus and outer shell makes it easier for the atom to attract electrons.

  • Increasing distance between the nucleus and outer shell makes it easier for the atom to attract electrons.

  • Decreasing distance between the nucleus and outer shell makes it harder for the atom to attract electrons.

  • Increasing distance between the nucleus and outer shell makes it harder for the atom to attract electrons.

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21 mark

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?

  State Colour Reaction with KI (aq)
A liquid yellow brown colour
B solid green no reaction
C gas dark brown brown colour
D solid black no reaction

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