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d and f-Block Elements Test - 3
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d and f-Block Elements Test - 3
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  • Question 1/7
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    Electronic configurations of different elements are given below in the options. Based on their electronic configurations, choose the one having the highest ionisation energy.

    Solutions

    [Ar] 3d10 4s2 is the electronic configuration of zinc.

    Zinc has the highest ionisation energy among the elements of the 3d transition series as it has the highest effective nuclear charge and a stable electronic configuration of fully filled orbitals.

     

  • Question 2/7
    1 / -0

    Copper, in the aqueous solutions of its salts, almost invariably exists in the +2 oxidation state because

    Solutions

    Cu+2 being smaller in size has a higher charge density and as a result, it has a higher heat of hydration, which more than compensates for the higher second ionisation energy of copper.

    Whereas, the hydration energy for Cu+ is less and does not compensate for the high ionisation energy.

     

  • Question 3/7
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    Choose the correct statement(s) about manganese from among the following:

    a. Mn3+ is a reducing agent in its aqueous solution.
    b. The oxidation state of manganese in its fluoride is +4 (MnF4).
    c. The oxidation state of manganese is observed in its fluorides because the electronegativity of fluorine is the highest.

    Solutions

    Statement (a) is incorrect as Mn3+ is a strong oxidising agent and is spontaneously reduced to Mn+2 ([Ar]3d44s0) in its aqueous solution.
    Statement (b) is correct as the highest oxidation state of manganese in MnF4 is +4.
    Statement (c) is incorrect as the highest oxidation state of Mn is observed in its oxides because oxygen is capable of forming double bonds.

     

  • Question 4/7
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    To which of the following categories will the given reaction belong?

    2Cu+ → Cu + Cu2+

    Solutions

    Copper is getting both oxidised as well as reduced. Hence, the reaction involves disproportionation of copper.

     

  • Question 5/7
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    An aqueous solution of KCN is added to a solution of ferrous salt. The complex formed is presented by

    Solutions

    Fe2+ + 6CN- → [Fe(CN)6]4-
    The complex ion formed is hexacyanoferrate(II).

     

  • Question 6/7
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    Some elements of 3d series are shown in the options. Choose the pair of elements with the highest and lowest melting points, respectively.

    Solutions

    The metallic bond is strongest in Cr with six unpaired electrons and weakest in Zn with no unpaired electron.
    Among the elements of the 3d-series, Cr has the highest melting point and Zn has the lowest melting point.

     

  • Question 7/7
    1 / -0

    A metal gives two chlorides X and Y. X gives black precipitate with NH4OH and Y gives white. With KI, Y gives red precipitate, which is soluble in excess of KI. X and Y respectively are

    Solutions

    (X) is mercurous chloride (Hg2Cl2) and Y is mercuric chloride (HgCl2).
    Hg2Cl2 + 2NH4OH → Hg + NH2HgCl (black ppt) + NH4Cl + 2H2O
    HgCl2 + 2KI → HgI2 (red ppt) + 2KCl
    HgI2 + 2KI → K2[HgI4] (soluble)
    K2[HgI4] is Nessler's reagent used for testing the presence of NH3 and proteins.

     

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