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Purification an...

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  • Question 1
    4 / -1

    To an acidified dichromate solution, a pinch of Na2O2 is added and shaken. What is observed?

  • Question 2
    4 / -1

    A mixture of zinc oxide and cupric oxide can be separated by

  • Question 3
    4 / -1

    The effective component of bleaching powder is

  • Question 4
    4 / -1

    When the solution of an inorganic salt in sodium hydroxide is boiled, a pungent gas is produced, which turns moist red litmus paper blue and a mercurous nitrate solution black. This indicates the presence of ________ ion in the salt.

  • Question 5
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    The constituents of which of the following pairs of ions in a dilute HCl medium cannot be separated by passing H2S gas through it?

  • Question 6
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    Highly pure dilute solution of sodium in liquid ammonia

  • Question 7
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    Heating (NH4)2Cr2O7 yields a gas, which is also obtained by

  • Question 8
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    A sodium salt of an unknown anion when treated with MgCl2 gives a white precipitate, only on boiling. The anion is

  • Question 9
    4 / -1

    [X] + H2SO4 → [Y] a colourless gas with suffocating smell

    [Y] + K2Cr2O7 + H2SO4 → green solution [X] and [Y] is

  • Question 10
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    A solution is 10–3 M each in Mn2+, Fe2+, Zn2+ and Hg2+. It is treated with H2S in alkaline medium. If Ksp of MnS, FeS, ZnS and HgS are 10–15, 10–23, 10–20 and 10–54 respectively, which one will precipitate first?

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