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The s-Block Elements Test -8

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

    Dead burnt plaster is

    Solution

    Above 393 K, no water of crystallisation is left and anhydrous calcium sulphate, CaSO4 is formed. This is known as ‘dead burnt plaster’.

  • Question 2
    1 / -0

    Suspension of slaked lime in water is known as

    Solution

    Slaked lime is Ca(OH)2. Suspension of slaked lime in water is known as milk of lime because it looks just like milk.

  • Question 3
    1 / -0

    Which of the following elements does not form hydride by direct heating with dihydrogen?

    Solution

    Be doesnot form hydride directly by reacting with hydrogen. It possess polymeric bridge structure with H2  between two atom

  • Question 4
    1 / -0

    The formula of soda ash is

    Solution

    Above 373K, sodium carbonate monohydrate becomes completely anhydrous and changes to a white powder called soda ash i.e. Na2CO3.

  • Question 5
    1 / -0

    A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is

    Solution

    Ca give brick red flame.

  • Question 6
    1 / -0

    Which of the following statements is true about Ca(OH)2?

    Solution

    Ca(OH)2 is a white amorphous powder which is used in the manufacture of bleaching powder. It is used in white wash because of its disinfectant nature.

  • Question 7
    1 / -0

    Identify the correct formula of halides of alkaline earth metals from the following:

    Solution

     The tendency to form halide hydrates gradually decreases down the group. BaCl2.2H2O i.e. Barium chloride dihydrate exists.

  • Question 8
    1 / -0

    Choose the correct statements from the following.

    Solution

    THe surface of the Beryllium metal is covered with a thin layer of oxides that helps protect the metal from attack by acid, but powdered beryllium metal dissolves readily in dilute acids

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