A LevelChemistryCambridge (CIE)Exam Questions11. Group 17Some Reactions of the Halide Ions

Some Reactions of the Halide Ions (Cambridge (CIE) A Level Chemistry): Exam Questions

Exam code: 9701

1 hour21 questions

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Some Reactions of the Halide Ions

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1
1 mark

Which anion forms a white precipitate when tested with acidified aqueous silver nitrate?

  • CO32-

  • SO42-

  • OH-

  • Cl-

Choose your answer

2
1 mark

Which row correctly identifies the chemical test and observation for an iodide ion?

Chemical test

Observation

A

Acidified aqueous silver nitrate

Yellow precipitate insoluble in concentrated aqueous ammonia

B

Acidified barium chloride

White precipitate insoluble in hydrochloric acid

C

Acidified potassium nitrate

Yellow precipitate insoluble in concentrated aqueous ammonia

D

Bromine water

Brown solution changes to colourless solution

    Choose your answer

    3
    1 mark

    Which observations are made when solid sodium bromide reacts with concentrated sulfuric acid?

    • Steamy fumes only

    • Red-brown gas and yellow solid produced

    • Yellow solid produced

    • Red-brown gas and pungent odour

    Choose your answer

    4
    1 mark

    Which statement explains why the oxidising power of the halogens decreases down Group 17?

    • Shielding increases down the group, making it more difficult to attract an incoming electron

    • Atomic radius decreases down the group

    • Shielding increases down the group, making it easier to donate an electron

    • The halogens become more electronegative down the group

    Choose your answer

    1
    1 mark

    Which compounds are produced when solid potassium bromide reacts with concentrated sulfuric acid?

    • Potassium hydrogen sulfate, hydrogen bromide, bromine, water and sulfur dioxide

    • Potassium hydrogen sulfate, hydrogen bromide, bromine and water

    • Potassium hydrogen sulfate, hydrogen bromide and bromine

    • Potassium hydrogen sulfate and hydrogen bromide

    Choose your answer

    2
    1 mark

    Astatine is the element below iodine in Group 17 of the Periodic Table.

    Which statement about astatine is most likely to be correct?

    • Silver astatide reacts with dilute aqueous ammonia in excess to form a solution of a soluble complex.

    • Solid sodium astatide and hot concentrated sulfuric acid react to form astatine.

    • Astatine and aqueous potassium chloride react to form aqueous potassium astatide and chlorine.

    • Solid potassium astatide and concentrated sulfuric acid react to produce white fumes of hydrogen astatide only.

    Choose your answer

    3
    1 mark

    A powder is known to be either a single sodium halide or a mixture of two different sodium halides.

    An aqueous solution of the powder produces a pale yellow precipitate when tested with acidified aqueous silver nitrate. When concentrated aqueous ammonia is added, the precipitate partially dissolves, leaving a darker yellow precipitate.

    What does the powder contain?

    • Sodium iodide only

    • Sodium bromide only

    • A mixture of sodium chloride and sodium bromide

    • A mixture of sodium chloride and sodium iodide

    Choose your answer

    4
    1 mark

    Solid potassium halides react with concentrated sulfuric acid, according to the following equations.

    Reaction 1: 2KCl + H2SO4 → K2SO4 + 2HCl

    Reaction 2: 2KBr + 2H2SO4 → K2SO4 + SO2 + Br2 + 2H2O

    Reaction 3: 8KI + 5H2SO4 → 4K2SO4 + H2S + 4I2 + 4H2O

    What is the largest change in the oxidation number of sulfur in each reaction?

    Reaction 1

    Reaction 2

    Reaction 3

    A

    0

    0

    4

    B

    0

    2

    4

    C

    0

    2

    8

    D

    0

    4

    8

      Choose your answer

      1
      1 mark

      A student observed the reactions when solid sodium bromide and solid sodium fluoride were each reacted separately with concentrated sulfuric acid and concentrated phosphoric acid. The observations are recorded in the table below.

      Sodium bromide

      Sodium fluoride

      Concentrated H2SO4

      Steamy fumes and brown vapour

      Colourless acidic gas formed

      Concentrated H3PO4

      Colourless acidic gas formed

      Colourless acidic gas formed

      Which deduction can be made from these observations?

      • Concentrated phosphoric acid is a stronger oxidising agent than concentrated sulfuric acid.

      • Concentrated phosphoric acid is a stronger oxidising agent than bromine.

      • Concentrated sulfuric acid is a stronger oxidising agent than fluorine.

      • Concentrated sulfuric acid is a stronger oxidising agent than bromine.

      Choose your answer

      2
      1 mark

      The following two experiments are carried out with anhydrous potassium chloride.

      Experiment 1: Aqueous silver nitrate is added to an aqueous solution of potassium chloride, followed by an excess of aqueous ammonia - observation X.

      Experiment 2: Concentrated sulfuric acid is added to solid potassium chloride, and the fumes produced are bubbled into aqueous potassium iodide solution - observation Y.

      Which row correctly identifies observations X and Y?

      X

      Y

      A

      Colourless solution

      Brown solution

      B

      Colourless solution

      Colourless solution

      C

      White precipitate

      Brown solution

      D

      White precipitate

      Colourless solution

        Choose your answer

        3
        1 mark

        Element 85, astatine, is a halogen. When concentrated sulfuric acid is added to solid sodium astatide, the products are astatine, hydrogen astatide, hydrogen sulfide and sodium sulfate.

        Which product is formed by the oxidation of one of the constituents of sodium astatide?

        • Sodium sulfate

        • Hydrogen sulfide

        • Hydrogen astatide

        • Astatine

        Choose your answer

        4
        1 mark

        Q is a salt of one of the Group 17 elements chlorine, bromine, iodine, or astatine.

        The reaction scheme shows a series of reactions using a solution of Q as the starting reagent.

        Q (aq) rightwards arrow from AgNO subscript 3 space open parentheses aq close parentheses to HNO subscript 3 space open parentheses aq close parentheses of precipitate rightwards arrow with excess space dilute space NH subscript 3 space open parentheses aq close parentheses on top colourless solution rightwards arrow with excess space dilute space HNO subscript 3 space open parentheses aq close parentheses on top precipitate

        What could Q be?

        • Sodium chloride

        • Sodium bromide

        • Potassium iodide

        • Potassium astatide

        Choose your answer

        5
        1 mark

        Two students, R and S, were asked to draw bar charts to represent how some properties of the halogens and their compounds differ in magnitude. Their diagrams are shown.

        Two bar charts drawn by students R and S showing properties of halogens and their compounds. Student R's chart shows the enthalpy change for halogen reactions with hydrogen, with bar heights decreasing from Cl to Br to I indicating less exothermic reactions going down the group. Student S's chart shows the solubility of silver halides in ammonia, with bar heights increasing from AgCl to AgBr to AgI.

        Which of the students' diagrams is correct?

        • S only

        • R only

        • Both R and S

        • Neither R nor S

        Choose your answer

        6
        1 mark

        X, Y and Z represent different halogens. The table shows the results of nine experiments in which aqueous solutions of X2, Y2 and Z2 were separately added to aqueous solutions containing X-, Y- and Z- ions.

        X- (aq)

        Y- (aq)

        Z- (aq)

        X~2~ (aq)

        No reaction

        No reaction

        No reaction

        Y~2~ (aq)

        X2 formed

        No reaction

        Z2 formed

        Z~2~ (aq)

        X2 formed

        No reaction

        No reaction

        Which sequence gives X-, Y- and Z- in order of decreasing strength as reducing agents?

        • X-, Y-, Z-

        • X-, Z-, Y-

        • Y-, Z-, X-

        • Z-, X-, Y-

        Choose your answer

        7
        1 mark

        Concentrated sulfuric acid is added to separate solid samples of sodium chloride and sodium bromide. In both reactions, steamy fumes are observed. However, in the reaction with sodium bromide, a brown gas is also produced.

        Which statement correctly explains these observations?

        • It forms an acidic oxide that reacts with aqueous NaOH to form a salt.

        • Br- ions are stronger reducing agents than Cl- ions.

        • Br- ions are more easily reduced to bromine than Cl- ions.

        • Sulfuric acid acts as a Brønsted–Lowry base in the reaction that produces steamy fumes.

        Choose your answer