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S and P Block Elements Test - 2

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S and P Block Elements Test - 2
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  • Question 1
    1 / -0

    On heating anhydrous Na2CO3, ........ is evolved

    Solution

    Anhydrous form of Na2CO3 does not decompose on heating even to redness. It is a amorphous powder called soda ash.

  • Question 2
    1 / -0

    The most dangerous method of preparing hydrogen would be by the action of HCl and

    Solution

    2K + 2HCl → 2KCl + H2 (violent reaction).

  • Question 3
    1 / -0

    Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point

    Solution

    Although lattice energy of Licl higher than NaCl but LiCl is covalent in nature and NaCl ionic there after, the melting point decreases as we move NaCl because the lattice energy decreases as a size of alkali metal atom increases (lattice energy ∞ melting point of alkali metal halide)

     

  • Question 4
    1 / -0

    The reagent commonly used to determine hardness of water titrimetrically is

    Solution

    It form calcium and magnesium complex with EDTA salt.

  • Question 5
    1 / -0

    Which of the following is correct

    Solution

    Na2Co3, K2CO3 and (NH4)2 CO3 are soluble in water because hydration energy is more than lattice energy

     

  • Question 6
    1 / -0

    The colour of hydrogen is

    Solution

    It is a colourless gas.

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