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S-Block Elements Test - 8

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

    A mixture of MgCl2 and MgO is called:

    Solution

    Mixing solid MgO with MgCl2 brine produces Sorel cement. The cement is a mixture of magnesium oxide (burnt magnesia) with magnesium chloride, with the approximate chemical formula Mg4Cl2(OH)6(H2O)8, corresponding to a weight ratio of 2.5–3.5 parts MgO to one part MgCl2.

     

  • Question 2
    1 / -0

    Which of the following compounds is/are formed when lithium is heated in air?

    Solution

    Lithium forms both Li2O and Li3N when heated in air, as given below:
    6Li + N2 → 2Li3N2
    4Li + O2 → 2Li2O

     

  • Question 3
    1 / -0

    Calcium carbide on hydrolysis forms

    Solution

    CaC2 + 2H2O → Ca(OH)2 + C2H2

     

  • Question 4
    1 / -0

    Which of the following oxides is not expected to react with sodium hydroxide?

    Solution

    CaO is the most stable.

     

  • Question 5
    1 / -0

    To a clear solution of a compound X, a solution of barium chloride (BaCl2) is added to give a white precipitate which does not dissolve in dilute HCl. The compound X is a

    Solution

    X is a sulphate because BaSO4 is insoluble in dilute HCl.

     

  • Question 6
    1 / -0

    Initial setting of cement is mainly due to

    Solution

    Initial setting of cement is mainly due to hydration and gel formation.

     

  • Question 7
    1 / -0

    A chemical compound 'A' is used for water softening to remove temporary hardness. 'A' reacts with Na2CO3 to form caustic soda. A substance B is the cause of temporary hardness and is removed as C. Then, A, B and C respectively are

    Solution

    A is calcium hydroxide.
    B is calcium bicarbonate.
    C is calcium carbonate.

     

  • Question 8
    1 / -0

    Which of the following metal ions plays an important role in muscle contraction?

    Solution

    Ca+ ions are involved in muscle contraction.

     

  • Question 9
    1 / -0

    Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is

    Solution

    Bleaching powder is Ca(OCl)Cl. It contains OCl- ion and the corresponding acid is HClO. The anhydride of HCIO is
    HOCI + HCIO → H2O + Cl2O

     

  • Question 10
    1 / -0

    H2O is dipolar whereas BeF2 is not. It is because

    Solution

    H2O is angular and BeF2 is linear.

     

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