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O LevelChemistryCambridge (CIE)Exam Questions8. The Periodic Table8.3 Group VII Properties

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

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8.3 Group VII Properties

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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

      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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        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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