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The d- and f- Block Elements Test - 53

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The d- and f- Block Elements Test - 53
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  • Question 1
    1 / -0
    Cuprous ion is colourless while cupric ion is coloured because
    Solution
    Cuprous ion is colourless while cupric ion is coloured because Cuprous ion has a complete d-orbital and cupric ion has an incomplete d-orbital.
    Hence, Option "D" is the correct answer.
  • Question 2
    1 / -0
    Which of the following will give green hydrated ion?
    Solution
    Fe2+ Fe^{2+} and Ni2+ Ni^{2+} both will give green hydrated ion.
  • Question 3
    1 / -0
    Fe2+ Fe^{2+} shows 
    Solution
    Fe2+ Fe^{2+} ion have 4 unpaired electron so it is paramagnetic. 
  • Question 4
    1 / -0
    Which of the following is not an actinide?
    Solution
    Terbium is lanthanide as it belongs to 4f -series having configuration [Xe]4s96s2. [Xe]4s^9 6s^2 . However the remaining members belong to 5f - series (actinides).
  • Question 5
    1 / -0
    Hydrated Cu+2 Cu^{+2} ion will be 
    Solution
    Colour of Cu+2Cu^{+2} is Blue.
    Hence, Option "C" is the correct answer.
  • Question 6
    1 / -0
    For which of the following transition metal ion is shown highest magnetic moment having outer electronic configuration 
    Solution
    Magnetic moment depends upon the number of unpaired electrons. 3d53d^5 will show the highest magnetic moment as it has 5 unpaired electrons.
  • Question 7
    1 / -0
    Which of the following ions is coloured? 
    Solution
    Cu2+[Ar]3d94s0 Cu^{2+} \rightarrow [Ar]3d^9 4s^0

    Cu2+ Cu^{2+} ion is coloured due to the presence of 1 unpaired electron in d-orbitals.
  • Question 8
    1 / -0
    Which one of the following properties is not of transition elements?
    Solution
    Transition metal show variable valency due to presence of vacant d-orbitals. It does not show  fixed valency.
  • Question 9
    1 / -0
    Which of the following is not true for transition metals? 
    Solution
    Transition metals crystallize in all the three forms i.e. face centred cubic (fcc), hexagonal close packed (hcp) and body centred cubic (bcc) crystals.
  • Question 10
    1 / -0
    The 3d-metal ions are paramagnetic in nature because 
    Solution
    They have one or more unpaired d - electron. Paramagnetic nature is due to unpaired electron present in them.
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