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The p-Block Elements Test - 8

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The p-Block Elements Test - 8
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Ammonia can be dried using

    Solution

    CaO is used to dry NH3. As ammonia is basic in nature, it can only be dried by a basic agent. otherwise, it can react with the drying agent.

  • Question 2
    1 / -0

    The gases absorbed by alkaline pyrogallol and oil of cinnamon are respectively,

    Solution

    Alkaline pyrogallol absorbs O2 from air turning brown. Pyrogallol is the common name for 1,2,3-trihydroxybenzene. Hydroxy groups are strong activators of aromatic systems. They form quinones which is coloured .

    Oil of cinnamon absorbs ozone because it contains unsaturated hydrocarbons which may be used to absorb ozone.

  • Question 3
    1 / -0

    Which one of the following acts as an antichlor?

    Solution

    NaHSO3 act as antichlor. Antichlor is a substance used to decompose residual hypochlorite.

    An antichlor is a substance used to remove the excess of chlorine. Antichlors include sodium bisulfite, potassium bisulfite, sodium metabisulfite, sodium thiosulfate, and hydrogen peroxide.

  • Question 4
    1 / -0

    When KBr is treated with conc. H2SO4, reddish brown gas is evolved. The gas is

    Solution

    Br– get oxidized to Br2 on treatment with H2SO4.
    2KBr + 2H2SO4 →K2SO4+ SO2 ↑+ Br2 ↑+ 2H2O.
    Concentrated sulphuric acid oxidises HBr to Bromine.

  • Question 5
    1 / -0

    Pure chlorine is obtained

    Solution

    MnO2 and HCl react to form Cl2.

    MnO2(s) + 4HCl(l) → MnCl2(s) + 2H2O(l) + Cl2(g)↑

  • Question 6
    1 / -0

    When sugar is treated with conc. Sulphuric acid, the sugar is charred. In this process, sugar is

    Solution

    Concentrated H2SO4 is a dehydrating agent and is hygroscopic in nature. So it absorbs water to form black charry mass of carbon.C12H22O11 → 12C + 11H2O

  • Question 7
    1 / -0

    First compound of inert gas was prepared by Bartlett in 1962. The compound is

    Solution

    Bartlett in 1962 prepared Xe[PtF6] . He passed orange red vapours platinum hexa fluoride over xenon to form yellow solid of xenon platinum hexa fluoride.

    PtF6 + Xe → Xe[PtF6] xenon hexafluoroplatinate(V)

  • Question 8
    1 / -0

    A radioactive element which can decay to give two noble gases is

    Solution

    Th232 can decay to give two noble gases. They are radon and xenon. Any sample of thorium or its compounds contain traces of these daughters, which are isotopes of thallium, lead, bismuth, polonium, radon, radium, and actinium.232Th also very occasionally undergoes spontaneous fission rather than alpha decay, to form xenon gas as a fission product.

  • Question 9
    1 / -0

    Available chlorine is librated from bleaching powder when

    Solution

    Bleaching powder when reacts with dilute acids liberates chlorine.

    Ca(OCl)2 +4 HCl →CaCl2 + H2O + 2Cl2↑

    The main constituent of bleaching powder is calcium hypochlorite which supplies chlorine with dilute acids.

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