Prepare CuSO4.5H2O starting from copper pyrites. from Chemistry
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    Subject
    Chemistry

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    NEET Class 12

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    NEET Chemistry Solved Question Paper 2008

    Multiple Choice QuestionsShort Answer Type

    41.

    Considering the first dissociation which is more acidic and why -fumaric acid and maleic acid?

    Answer
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    42.

    Prepare CuSO4.5H2O starting from copper pyrites.

    Pyrite is converted into cuprous sulphide and ferrous sulphide when reacts with oxygen.

    2CuFeS2 + O2 → Cu2S + 2FeS + SO2

    Cuprous sulphide and ferrous sulphide are partially oxidised.

    2FeS + 3O2 → 2FeO + 2SO2

    2Cu2S + 5O2 → 2CuSO4 + 2CuO

    2FeO + 12O2 → Fe2O3

    The roasted mass is extracted with water, CuSO4.5H2O obtains.

    CuSO4 ⇌ CuSO4.5H2O

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    43.

    A cell is represented by Zn|Zn2+ (aq) || Cu2+ (aq)| Cu. Given, Cu2+ + 2e- → Zn, E° = -0.763 V. Write the cell reactions, emf of the cell and state whether the cell reaction will be spontaneous or not?

    Answer
    44.

    Write down true products when n-butyl trimethyl amine is heated strongly.

    Answer
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    45.

    Both phenol and alcohol contains -OH group. But still phenol is more acidic than alcohol. Explain why?

    Answer
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