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Chemical Reactions and Equations Test - 11

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Chemical Reactions and Equations Test - 11
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  • Question 1
    1 / -0

    Which of the statement about the reaction below are incorrect? 2PbO (s) + C (s) → 2Pb (s) + CO2 (g)
    (i) lead is getting reduced,
    (ii) Carbon dioxide is getting oxidised,
    (iii) Carbon is getting oxidised,
    (iv) Lead oxide is getting reduced

    Solution

    Here, lead oxide loses oxygen and hence reduced.
    Carbon gains oxygen and hence oxidized.
    And not lead is getting reduced.
    Carbon dioxide is not getting oxidized.

  • Question 2
    1 / -0

    What happens when dilute HCl is added to iron fillings? Select the correct answer.

    Solution

    Metals react with acids to form metal salt and hydrogen gas 

  • Question 3
    1 / -0

    Colour of copper sulphate solution changes when an iron nail is dipped in it because of

    Solution

    Fe is higher in the reactivity series than Cu so it displaces Cu from its compound 

  • Question 4
    1 / -0

    What happens when copper metal is added to silver nitrate solution?

    Solution

    It's a displacement as well as a redox reaction 

  • Question 5
    1 / -0

    Fe2O3 + 2Al → Al2O3 + 2Fe This reaction is an example of -

    Solution

    Displacement reaction as more reactive metal (Al) takes the place of less reactive metal in the compound

  • Question 6
    1 / -0

    Pieces of Zn metal are added to four different test tubes containing different solutions. In which test tube no change is observed?

    Solution

    Zn cannot displace Al from Al2(SO4)3 solution.
    Zn can displace Fe from FeSO4 solution. Zn + FeSO4→ ZnSO4 + Fe
    Al can displace Zn from ZnSO4 solution. 2Al + 3ZnSO4→ 3Zn + Al2(SO4)3
    Zn can displace Cu from CuSO4 solution. Zn + CuSO4→ ZnSO4 + Cu

  • Question 7
    1 / -0

    Metathesis reactions are called-

    Solution

    Double displacement reaction

    it is so because it is a chemical reaction involving exchange of bonds between two reacting species 

  • Question 8
    1 / -0

    Conditions necessary for rusting are

    (i) presence of Fe 

    (ii) presence of moisture and air 

    Solution

    Iron and steel rust when they come into contact with water and oxygen. Both water and oxygen are needed for rusting to occur. Impurities in the iron, the presence of water vapor, acids, salts and carbon dioxide hastens rusting.
    So, (i) and (ii) correct

  • Question 9
    1 / -0

    Na2SO4(aq) + BaCl2(aq) → BaSO4 + 2NaCl(aq) reaction is an example of

    Solution

    Double displacement and Precipitation Reaction as BaSO4 is precipitated out 

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