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Coordination Compounds Test - 25

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Coordination Compounds Test - 25
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The compounds $$[Co(SO_4)(NH_3)_5]Br$$ and $$[Co(SO_4)(NH_3)_5]Cl$$ represents:
    Solution
    The compounds $$[Co(SO_4)(NH_3)_5]Br$$ and $$[Co(SO_4)(NH_3)_5]Cl$$ represent no isomerism as they have different molecular formulae.

    Note: Isomers have the same molecular formula.
  • Question 2
    1 / -0
    TEL is a compound used as
    Solution
    Anti knocking compounds are the chemicals which reduce knocking for improving the quality of gasoline. example:- Tetraethyl lead (TEL)

    Hence, the correct option is $$\text{C}$$
  • Question 3
    1 / -0
    In which one of the following the central atom is $$sp^{3}$$ hydridised?
  • Question 4
    1 / -0
    The solubilities of carbonates decrease down the magnesium group due to decrease in
  • Question 5
    1 / -0
    Which of the following statements are correct?
    I) $$CO$$ forms a complex with $$CuCl$$ in $$con. HCl$$
    II) $$Ni$$ forms a volatile carbonyl compound with $$CO$$
    III) $$CO$$ act as a lewis acid
    (IV) $$CO$$ oxidizes $$Cu$$ to $$CuO$$
    Solution

    i)  Correct. When $$Cu(I)Cl$$ is dissolved in conc. $$HCl$$, it absorbs $$CO$$ forming an adduct $$CuCl(CO)$$.
    ii) Correct 
       $$Ni+4CO\rightarrow Ni{ \left( CO \right)  }_{ 4 }$$
                                    volatile 
    iii) Correct. $$CO$$ can act as a Lewis acid because $$CO$$ has a vacant $${ \Pi  }^{ \ast  }$$ orbital (antibonding) that can accept electrons from an electron pair donor.
    Ans. (A) and (B)

  • Question 6
    1 / -0
    $$2.33$$g of compound X(empirical formula $$CoH_{12}N_4Cl_3)$$ upon treatment with excess $$AgNO_3$$ solution produces $$1.435$$g of a white precipitate. The primary and secondary valences of cobalt in compound X, respectively, are.
    [Given : Atomic mass: $$Co=59, Cl=35.5, Ag=108$$].
    Solution
    Since $$0.01$$ mole of $$X$$ produces $$0.01$$ mole of $$AgCl$$,hence one $$Cl^-$$ is out of coordination sphere or complex is $$[CO(NH_3)_4Cl_2]Cl$$ AND HENCE $$CO(3+)$$,has $$6$$ coordination number
  • Question 7
    1 / -0
    The concept hybridisation of orbits of an atom was introduced by ______.
    Solution
    The concept of hybridisation of orbits of an atom was introduced by Linus Pauling.
    Hybridisation is the concept of mixing atomic orbitals into new hybrid orbitals.
  • Question 8
    1 / -0
    Barium ions, $$CN^-$$ and $$Co^{2+}$$ form an ionic complex. If that complex is supposed to be $$75\%$$ ionised in water with vant Hoff factor 'i' equal to four, then the coordination number of $$Co^{2+}$$ in the complex can be.
    Solution
    Complex formed is $$Bq_2[CO(CN)_6]$$ in which oxidation of $$CO$$ is $$(2+)$$ and $$CN$$ of $$CO$$ is six.
  • Question 9
    1 / -0
    When one mole of each of the following complex is treated with an excess of $$AgNO_3$$.which will give maximum amount of $$AgCl$$?
    Solution
    In coordination compounds, the counter ions can react to give another product but the complex ion will not split in a solution. 

    Here, when one mole of a complex given when reacted with $$AgNO_3$$ then the maximum counter ion compound will give the maximum amount of $$AgCl$$. 

    Hence, $$[Co(NH_3)_6]Cl_3$$ having a maximum number of 3 counter ions in the given options will produce more amount of $$AgCl$$.

    $$[Co(NH_3)_6]Cl_3\rightarrow [Co(NH_3)_6]^{3+}(aq)+3Cl^-(aq)$$

    $$AgNO_3+Cl^-(aq)\rightarrow AgCl+NO_3^-(aq)$$
  • Question 10
    1 / -0
    Hexa ammine nickel (II) hexa nitro cobaltate (III) can be written as:
    Solution
    $$[Ni(NH_3)_6]_3[CO(NO_2)_6]_2\equiv 3[Ni(NH_3)_6]^{2+}|2[CO(NO_2)_6]^{3-}$$
    Since $$3Ni(2+)$$ balance with $$2Co(3+)$$
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