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S-Block Elements Test - 6

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S-Block Elements Test - 6
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Weekly Quiz Competition
  • Question 1
    1 / -0

    The order of solubility of lithium halides in non-polar solvents is

    Solution

    Due to the increase in anionic size, the covalent character of the halides increases. Its solubility in non-polar solvents increases.

     

  • Question 2
    1 / -0

    The correct order of solubility of the sulphates of alkaline earth metals in water is

    Solution

    The solubility of the sulphates decreases down the group because of the decrease in the magnitude of hydration enthalpy down the group.

     

  • Question 3
    1 / -0

    Ba, Sr, Ca and Mg may be arranged in order of decreasing first ionization energy (IE1) as

    Solution

    IE1 decreases down the group because of increasing atomic size.

     

  • Question 4
    1 / -0

    When ammoniacal solution of MgSO4 is heated with Na2HPO4 in the presence of NH4Cl, a white precipitate of _____ is formed.

    Solution

    Mg2+ + NH3 + HPO42- → Mg(NH4)PO4

     

  • Question 5
    1 / -0

    Which of the following statements is false?

    Solution

    BeO is amphoteric, but CaO is basic in nature.

     

  • Question 6
    1 / -0

    Which of the following compounds on thermal decomposition forms basic as well as acidic oxide?

    Solution

    CaCO3 forms CaO (basic oxide) and CO2 (acidic oxide) upon thermal decomposition.

     

  • Question 7
    1 / -0

    In case of alkali metals, the covalent character decreases in the order

    Solution

    According to Fajans' rules, the larger the size of anion, the greater the covalent character.
    Order of size of anions: I- > Br- > Cl- > F-
    Therefore, order of covalent character is:
    MI > MBr > MCl > MF

     

  • Question 8
    1 / -0

    A metal M readily forms a water soluble sulphate MSO4, water insoluble hydroxide M(OH)2 and oxide MO, which becomes inert upon heating. The hydroxide is soluble in NaOH. The metal M is

    Solution

    The metal 'M' is beryllium (Be). BeSO4 is water soluble and Be(OH)2 is insoluble. BeO does not decompose upon heating. Be(OH)2 dissolves in NaOH to form Na2BeO2 (sodium beryllate).

     

  • Question 9
    1 / -0

    The hydroxide with the least Ksp value at room temperature is

    Solution

    Be(OH)2 has the least Ksp value as it is the least soluble in water.

     

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