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d and f Block Test - 8

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d and f Block Test - 8
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  • Question 1
    1 / -0.25

     

    Which of the following pairs of ions have same paramagnetic moment?

     

    Solution

     

     

    Cu2+ , Ti3+  will have same unpaired electrons and hence same paramagnetic moment.

     

     

  • Question 2
    1 / -0.25

     

    Which of the following metals have only one oxidation state?

     

    Solution

     

     

    Sc,Al  has only one oxidation state i.e. +3.

    Co,Fe  has various oxidation states; most common are +2 and +3.

     

     

  • Question 3
    1 / -0.25

     

    Mohr ’s salt is a

     

    Solution

     

     

    Mohr salt is an example of double salt. Mohr Salt is  

    FeSO4 . (NH4 )2  SO4 .6H2 O

     

     

  • Question 4
    1 / -0.25

     

    Red hot steel rods on suddenly immersing in water become

     

    Solution

     

     

    Red hot steel rods on suddenly immersing in water become hard and brittle.

     

     

  • Question 5
    1 / -0.25

     

    Which of the following methods is based on distribution law?

     

    Solution

     

     

    Parkes process is a process for removing silver from Pb. It is an example of Liquid liquid extractions

     

     

  • Question 6
    1 / -0.25

     

    Which is called chromic acid?

     

    Solution

     

     

    Chromic Acid  is a naturally occurring oxide with a formula H2 CrO4 .

     

     

  • Question 7
    1 / -0.25

     

    Which one of the following combines with Fe2+  ion to form a brown complex?

     

    Solution

     

     

    [Fe(H2 O)5 NO]2+ is brown color complex.

     

     

  • Question 8
    1 / -0.25

     

    Lucas reagent is

     

    Solution

     

     

    Lucas Test is done to distinguish primary secondary and tertiary alcohols. Lucas reagent is  ZnCl2  + HC

     

     

  • Question 9
    1 / -0.25

     

    Vitamin B12  contains?

     

    Solution

     

     

    Vitamin B12  contains  Co3+ .

     

     

  • Question 10
    1 / -0.25

     

    Which is least soluble in water?

     

    Solution

     

     

    Ag2 S is least soluble in water.

     

     

  • Question 11
    1 / -0.25

     

    A reduction in the atomic size with increase in atomic number is characteristic of the elements of

     

    Solution

     

     

    In f block elements with increase in atomic number atomic radii decreases smoothly.

     

     

  • Question 12
    1 / -0.25

     

    Nitrous oxide is evolved when Zn is treated with

     

    Solution

     

     

    4Zn + 10HNO3  →4Zn(NO3 )2  + N2 O + 5H2 O

     

     

  • Question 13
    1 / -0.25

     

    Ferrous sulphate on heating gives

     

    Solution

     

     

    FeSO4   on heating gives  SO2  and SO3

     

     

  • Question 14
    1 / -0.25

     

    In the reaction, SnCl2  + HgCl 2  → A + SnCl4

     

    Solution

     

     

    SnCl2  + HgCl 2  →Hg  + SnCl4

     

     

  • Question 15
    1 / -0.25

     

    Ag+  ion is isoelectronic with

     

    Solution

     

     

    Ag+  is isoelectronic with  Cd2+

     

     

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