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D and F Block Elements Test - 9

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D and F Block Elements Test - 9
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following statements is not correct?

    Solution

    Anhydrous zinc chloride cannot be obtained by heating the crystals of the dihydrate because a basic chloride is formed, which on heating, gives zinc oxide:

    ZnCI2. 2H2O → Zn(OH)CI + HCI + H2O

    Zn(OH)CI → ZnO + HCI

     

  • Question 2
    1 / -0

    The basic character of the transition metal monoxides follows the order:

    Solution

    The correct order is TiO > VO > CrO3 > FeO. All these transition metal oxides are in same period. The basic character of these oxides decreases due to decrease in atomic size and increase in ionisation energy. Due to this, electropositive character decreases. Thus, basic character decreases.

     

  • Question 3
    1 / -0

    In Goldschmidt aluminothermic process, thermite contains

    Solution

    In Goldschmidt aluminothermic process, thermite contains 3 parts of Fe2O3 and 1 part of Al.

     

  • Question 4
    1 / -0

    Which of the following pairs of transition metals does not exhibit variable valency?

    Solution

    Both Sc and Zn do not show variable valency.

     

  • Question 5
    1 / -0

    Which of the following has the highest paramagnetic character?

    Solution

    Fe3+: 3d5

    5 unpaired electrons, paramagnetic. 

    Among the given ions, Fe3+ has the highest number of unpaired electrons. Thus, it has highest paramagnetic character.

     

  • Question 6
    1 / -0

    Identify the incorrect statement

    Solution

    Mn2+: 3d5 

    Mn3+: 3d4 

    The electronic configuration of Mn2+is more stable than that of Mn3+. Hence, Mn2+ cannot be easily oxidised to Mn3+.

     

  • Question 7
    1 / -0

    Which of the following first row transition metal ions do not show paramagnetism?

    Solution

    Sc3+ has d0 configuration. Because of lack of unpaired electrons, Sc3+ does not show paramagnetism.

    Zn2+ has d10 configuration. Because of lack of unpaired electrons, Zn2+ does not show paramagnetism.

     

  • Question 8
    1 / -0

    Zn2+ has d10 configuration. Because of lack of unpaired electrons, Zn2+ does not show paramagnetism.

    Solution

    Among the Lanthanoids, as the size of the metal ion decreases (Lanthanoid contractions) the polorisation power of the metal ion increases causing a decrease in the basicity. Hence, La(OH)3 is most basic, whereas Lu(OH)3 is least basic.

     

  • Question 9
    1 / -0

    Which of the following lanthanoid elements is radioactive?

    Solution

    Promethium is effectively a man-made element and all its isotopes are radioactive with half-lives shorter than 20 years.

     

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