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Coordination Co...

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  • Question 1
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    The great scientist LAXMI isolated two complexes and in chemical abstract, she reported "A metal complex having composition $$Cr(NH_3)_4Cl_2Br$$ has been isolated in two forms, (A) and (B). The form (A) reacts with $$AgNO_3$$ to give a white precipitate readily soluble in dilute aqueous ammonia, whereas (B) gives a pale yellow precipitate soluble in concentrated ammonia.

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    Complexes A and B are respectively.

  • Question 2
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    A, B and C are three complexes of chromium(III) with the empirical formula $$H_{12}O_6Cl_3Cr$$. All the three complexes have water and chloride ions as ligands. Complex A does not react with concentrated $$H_2SO_4$$, whereas complex B and C lose $$6.75\%$$ and $$13.5\%$$ of their original weights respectively on treatment with concentrated $$H_2SO_4$$.

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    Complex A is?

  • Question 3
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    The correct order regarding electronegativity of hybrid orbitals of carbon is: 

  • Question 4
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    What is the formula of X if 

  • Question 5
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    A solution containing $$2.675$$g of $$CoCl_3\cdot 6NH_3$$ (molar mass $$=267.5$$ g $$mol^{-1}$$) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of $$AgNO_3$$ to give $$4.78$$g of $$AgCl$$(molar mass$$=143.5$$g $$mol^{-1}$$). The formula of the complex is?

  • Question 6
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    Complex manure is that which supplies:

  • Question 7
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    Match each coordination compound in List-I with an appropriate pair of characteristics from List-II and select the correct answer using the code given in the lists.

    $$\{en =H_2NCH_2CH_2NH_2$$ 'atomic numbers; $$Ti=22; Cr=24; Co=27 Pt=78\}$$

    List-IList-II
    (P) $$[Cr(NH_3)_4Cl_2]Cl$$$$(1)$$ Paramagnetic and exhibits ionization isomerism
    (Q) $$[Ti(H_2O)_5Cl](NO_3)_2$$$$(2)$$ Dimagnetic and exhibits cis-trans isomerism
    (R) $$[Pt(en)(NH_3)Cl]NO_3$$$$(3)$$ Paramagnetic and exhibits cis-trans isomerism
    (S) $$[Co(NH_3)_4(NO_3)_2]NO_3$$$$(4)$$ Dimagnetic and exhibits ionization isomerism

  • Question 8
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    One mole of the complex compound $$Co(NH_3)_5Cl_3$$ gives $$3$$ moles of ions on dissolution in water. One mole of the same complex reacts with two moles of $$AgNO_3$$ solution to yield two moles of $$AgCl(s)$$. The structure of the complex is?

  • Question 9
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    Which one of the following has the largest number of isomers?

  • Question 10
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    Coordination compounds have great importance in biological systems. In this context, which of the following statements is incorrect?

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