A LevelChemistryAQAExam Questions8. A-Level Practical Skills (A Level only)8.2 Inorganic Chemistry Practicals (A Level only)

Inorganic Chemistry Practicals (A Level only) (AQA A Level Chemistry)

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8.2 Inorganic Chemistry Practicals (A Level only)

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8.2 Inorganic Chemistry Practicals (A Level only)

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11 mark

Which row shows the correct observation for the reactions of [Cu(H2O)6]2+ (aq)?

 

Substance added

Observation

A

Na2CO3 (aq)

Blue precipitate which does not redissolve and fizzing

B

NH3 (aq)

Blue precipitate which redissolves to form a deep-blue solution with excess NH3 (aq)

C

NaOH (aq)

Blue precipitate which redissolves to form a deep-blue solution with excess NaOH (aq)

D

HCl (aq)

Blue precipitate initially which does not redissolve with excess HCl (aq)

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    21 mark

    A 20.00 cm3 of sodium sulfate(IV), Na2SO3, was titrated with 36.30 cm3 of 0.51 mol dm-3 of potassium dichromate, K2Cr2O7, in the presence of concentrated sulfuric acid, H2SO4.

    3SO32- (aq) + Cr2O72- (aq) + 8H+ (aq) → 2Cr3+ (aq) + 3SO42- (aq) + 4H2O (l)

    What is the number of moles of sodium sulfate(IV), Na2SO3?

    • 0.06 moles 

    • 0.02 moles

    • 0.03 moles 

    • 0.05 moles 

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    31 mark

    Zinc metal is added to a solution containing VO2+ ions.

    The table shows some electrode half-equations and their standard electrode potentials

    Electrode half-equation

    EӨ / V

    Zn2+ (aq) + 2e- ⇌ Zn (s)

    -0.76

    V3+ (aq) + e- ⇌ V2+ (aq)

    -0.26

    VO2+ (aq) + 2H+ (aq) + e- ⇌ H2O (l) + V3+ (aq)

    +0.34

    VO2+ (aq) + 2H+ (aq) + e- ⇌ H2O (l) + VO2+ (aq)

    +1.00

    Which of the following is not correct?

    • The oxidation number of vanadium in VO2+ is +5

    • Zinc will oxidise V2+ to V3+

    • Zinc can reduce VO2+ to VO2+ 

    • The solution will change colour 

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    41 mark

    Which of the following shows a rate curve for a reaction in autocatalysis?

    q4-8-2-easy-mcq-physical-chemistry-practicals

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      51 mark

      A student performed the following chemical tests to identify an unknown solution.

      The student’s results are shown in the table.

      Chemical Test

      Result

      Addition of HNO3 (aq) and AgNO3 (aq) followed dilute NH3 (aq)

      Cream precipitate formed which was insoluble in dilute ammonia

      Addition of Na2CO3 (aq)

      Orange / brown precipitate and effervescence

      What is the identity of the unknown solution? 

      • FeBr3

      • FeCl3

      • FeCl2

      • FeBr2

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      11 mark

      Which of the following observations is correct when excess sodium carbonate, Na2CO3(aq), is added to separate samples of Fe2+ and Fe3+ ions in an aqueous solution?

       

      Fe2+

      Fe3+

      A

      Brown ppt and bubbles of gas

      Green ppt

      B

      Green ppt

      Brown ppt

      C

      Brown ppt

      Green ppt and bubbles of gas

      D

      Green ppt

      Brown ppt and bubbles of gas

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        21 mark

        The following equation shows the oxidation of sodium nitrate(III) solution to sodium nitrate(V) solution by potassium permanganate solution

        2MnO4- (aq) + 6H+ (aq) + 5NO2- (aq) → 2Mn2+ (aq) + 5NO3- (aq) + 3H2O (l)

        What volume of 0.06 mol dm-3 sodium nitrate(III) solution was required for the first permanent colour change when added to 25.00 cm3 of 0.03 mol dm-3 potassium permanganate solution?

        • 12.50 cm3

        • 0.03125 cm3

        • 0.005 dm3

        • 31.25 cm3

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        31 mark

        Which of the following is not correct when excess of ammonia is added to a solution of copper ions?

        • [Cu(NH3)4(H2O)2]2+ (aq) is formed 

        • A dark blue solution is observed

        • A blue precipitate of Cu(OH)2(H2O)4 is formed

        • 4 water molecules are replaced by 4 ammonia molecules

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        41 mark

        The table shows some electrode half-equations and their standard electrode potentials.

        Electrode half-equation

        EӨ / V

        Zn2+ (aq) + 2e- ⇌ Zn (s)

        -0.76

        V3+ (aq) + e- ⇌ V2+ (aq)

        -0.26

        Sn2+ (aq) + 2e- ⇌ Sn (s)

        -0.14

        VO2+ (aq) + 2H+ (aq) + e- ⇌ H2O (l) + V3+ (aq)

        +0.34

        NO3- (aq) + 4H+ (aq) + 3e- ⇌ NO (g) + 2H2O (l)

        +0.96

        VO2+ (aq) + 2H+ (aq) + e- ⇌ H2O (l) + VO2+ (aq)

        +1.00

         

        Identify the chemical species that will be able to oxidise vanadium(II) to vanadium(IV).

        • Sn2+ (aq)

        • NO3- (aq)

        • Zn2+ (aq) 

        • NO (g)

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        51 mark

        The overall equation for the reaction between manganate ions and ethanedioate ions is represented by

        2MnO4- (aq) + 5C2O42- (aq) + 16H+ (aq)  → 2Mn2+ (aq)  + 10CO2 (g) + 8H2O (l)

        Which of the following is correct?

        • The initial reaction has a low activation energy

        • Carbon C2O42- is oxidised from +4 to +3

        • The rate of reaction increases when Mn2+ ions are produced 

        • The rate of reaction increases when Mn3+ ions are produced

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        11 mark

        The diagram shows a reaction sequence involving the compounds of a transition metal:

        q1-8-2-mcq-hard-physical-chemistry-practicals

        Which reaction(s) produce gases?

        • D → A and D → C

        • D → C and B → C

        • Only D → A

        • A → B and B → C

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        21 mark

        Three elements from Period 3, P, Q and R, were separately heated in air and the pH of the oxides was tested.

        P burns with a pale blue flame. The oxide of Q is almost insoluble in water, but reacts with hydrochloric acid. R forms an oxide which contains 60% of the element by mass.

        What is the order of increasing pH of the three oxides?

        • R  <  Q  <  P

        • P  <  Q  <  R

        • Q  <  P  <  R

        • R  <  P  <  Q

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        31 mark

        A student used a colorimeter to measure the concentration of a coloured reactant against time and plotted the results on a graph shown below.

        q3-8-2-mcq-hard-physical-chemistry-practicals

        Which statement is true?

        • The product is colourless

        • The rate of reaction decreases during the reaction

        • The activation energy decreases during the reaction

        • The rate constant does not vary during the reaction

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        41 mark

        A 1.800 g iron supplement tablet was dissolved in sulfuric acid and converted to Fe2+. This was titrated against KMnO4 and required 26.50 cm3 of 0.100 mol dm-3 for complete reaction.

        What is the percentage by mass of iron in the iron supplement tablet?

        • 41.1%

        • 1.64%

        • 0.739%

        • 8.22%

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        51 mark

        Substance M is an inorganic double salt of a transition metal. It undergoes the following reactions:

        Test

        Observation

        Addition of dilute H2SO4

        No visible change

        Addition of dilute NaOH and warming

        Green gelatinous precipitate and pungent gas given off which turns red litmus blue

        Addition of excess NaOH

        Green gelatinous precipitate redissolves

        What could be the identity of M?

        • FeSO4

        • (NH4)2Fe(SO4)2

        • NH4Fe(SO4)2

        • NH4Cr(SO4)2

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