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S and P Block Elements Test - 9

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S and P Block Elements Test - 9
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following is not an ionic trihalide-

    Solution

    BF3 is covalent due to very high polarising power of B.

  • Question 2
    1 / -0

    Which of the following compounds are formed when boron trichloride is treated with water.

    Solution

    BCl3 + 3H2O → H3 BO3 + 3HCl 
    Except BF3 all tri halides are readily Hydrolysided by water.

  • Question 3
    1 / -0

    Which one of the following statement regarding BF3 is not correct -

    Solution

    Its a covalent compound.

  • Question 4
    1 / -0

    The compound which gives off oxygen on moderate heating is–

    Solution

    2HgO → 2Hg + O2 
    Only HgO – On moderate heating gives oxygen.

  • Question 5
    1 / -0

    Highest electron-affinity is associated with the configuration -

    Solution

    Electron affinity is defined as the tendency to accept an electron. To check for electron affinity, we need to check the resultant configuration. In option B, 2s2, 2p2 accepts 1 e– to give 2s2, 2p3 which is a half filled configuration and therefore every stable. Hence the configuration in option B has the highest electron affinity.

    Option 1 has an empty P orbital and a fully filled s orbital. Addition of 1 electron will give a comparatively less stable configuration.
    Option 3 is already half-filled. Addition of another electron will make it less stable.
    Option 4 lies in between. It's neither already stable nor does the resultant configuration has any extra stability.

  • Question 6
    1 / -0

    Which will have the maximum value of electron affinity Ox, Oy and Oz - 
    [x,y and z respectively are 0,–1and –2]

    Solution

    O0 ,O–1 ,O–2 
    P orbital configuration: P4 , P5 , P6

    Electron affinity is opposite of electron gain enthalpy. P4 has the highest affinity has it has the highest tendency to add an electron to complete its octet. O–1 has a negative charge already which will repel the incoming electron. therefore it has a comparatively lower affinity. O–2  has a complete octet along with twice negative charge so it will have the least affinity towards incoming electron.


    Ox > Oy > Oz

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