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The p-Block Elements Test - 7

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The p-Block Elements Test - 7
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Laughing gas is

    Solution

    N2O is also known as Laughing gas. when inhaled in moderate quantity, it produces a hysterical laughter.

  • Question 2
    1 / -0

    A metal X on heating in nitrogen gas gives Y. Y on treatment with water gives a colourless gas which when passed through copper sulphate solution gives a blue colour. Y is

    Solution

    Mg3N2 reacts with water to evolve NH3 which reacts with the copper ion to form a blue colour complex.

    3Mg + N2 → Mg3N2
    Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH3↑
    Cu2+ + 4NH3→[Cu(NH3)4]2+ (deep blue )

  • Question 3
    1 / -0

    The reagent used to distinguish between H2O2 and O3 is

    Solution

    H2O2 can decolorize the color of KMnO4.

    H2O2 + KMnO4 →O2 + MnO2 + KOH + H2O

    Ozone can activate soluble or insoluble Mn into permanganate ion but will not oxidise it further. So no effect.

  • Question 4
    1 / -0

    Which of the following is soluble in turpentine oil?

    Solution

    ozone is highly soluble in turpentine oil, glacial acetic acid or carbon tetrachloride

  • Question 5
    1 / -0

    The crystals of ferrous sulphate on heating gives 

    Solution

    FeSO4 on heating gives Fe2O3 + SO2 + SO3 + H2O.
    At 300 oC, hydrated ferrous sulphate becomes anhydrous and colourless. This salt when strongly heated breaks up to form ferric oxide with the evolution of SO2 and SO3.
    FeSO4.7H2O→ FeSO4 → Fe2O3 + SO2 ↑ + SO3 ↑

  • Question 6
    1 / -0

    When chlorine is passed through concentrated hot solution of KOH, the compound formed is

    Solution

    Cl2 on treatment with conc. Base form ClO3- ion.

    Cl2 + 6KOH →5KCl + KClO3 + 3H2O

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