ICSE Class 10 Chemistry Solved Question Paper 2017

Short Answer Type

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Answer the following questions with respect to the electrolytic process in the extraction of aluminium:
Identify the components of the electrolyte other than pure alumina and the role played by each.

Components of electrolyte: Cryolite and fluorspar
The role played by each electrolyte is given below:

  • Cryolite lowers the fusion temperature from 2050oC to 950oC and enhances conductivity.
  • Fluorspar and cryolite act as a solvent for the electrolytic mixture and increase conductivity.
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    Complete the following by selecting the correct option from the choices given:

    The metal which does not react with water or dilute H2SO4 but reacts with
    concentrated H2SO4 is _________. (Al/Cu/Zn/Fe)

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    Complete the following by selecting the correct option from the choices given:
    The metal whose oxide, which is amphoteric, is reduced to metal by carbon
    reduction ____________. (Fe/Mg/Pb/Al)

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    The divalent metal whose oxide is reduced to metal by electrolysis of its fused salt is __________. (Al/Na/Mg/K)

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    Name the following:
    The process of coating of iron with zinc.

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    Name the following:
    An ore of zinc containing its sulphide.

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    Answer the following questions with respect to the electrolytic process in the extraction of aluminium:
    Explain why powdered coke is sprinkled over the electrolytic mixture.

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    Name the following:
    An alloy of lead and tin that is used in electrical circuits.

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