Inorganic Chemistry Concept Capsule

 

Q: Identify the reactions that will not provide [NO]⁺  as the major product

    a) NOCl + AgNO₃ →

    b) NOCl + liq N₂O₄ →

    c)NOCl + liq BrF₃ →

    d) NaNO₃ + liq N₂O₄ →

1) a & d        2) a & b  

3) b & c        4) a only

Ans. (1)

Hints:

Reaction (a) is neutralization reaction 

         NOCl + AgNO₃ → AgCl + N₂O₄

_{In reaction (b) NOCl behaves as a acid in liq N2O4 and ionizes to give} [NO]⁺ as the major product

        NOCl + liq N₂O₄ → NO⁺ + Cl^-

^{In reaction (c) liquid BrF3 abstract Cl from NOCl to give as the major product}

       NOCl + liq BrF₃ → NO⁺ + BrF₃Cl

In reaction (d) NaNO3 behaves as a base in liquid N2O4 and ionizes to give sodium ion and nitrate ion

    NaNO₃ + liq N₂O₄ → Na⁺ + NO₃^-

Q: Among the following group of anions, the one which corresponds to the appropriate group of pseudo halide anions is  

    a) CNO^-, NCO^-, SeCN^-, N₃^-

    b) HSO₄^-, AsF₆^-, SCN^-, NO₃^-

    c) H₂PO₄^-, HSO₄^-, ClO₄^-, PF₆^-

    d) ClO₄^-, CN^-, H₂PO₄^-, BF₄^- 

Ans. (a)

Hints:

There are many anions that exhibit similar properties like halide ions. They are termed as pseudo halide and their dimers are called pseudo halogens. Therefore pseudo halides are CNO^-, CN^-, NCO^-, SeCN^-, N₃^- 

Q: Which is the number of ¹³C-NMR resonance exhibited by C₇₀ and nature (Magnetism) of rhombohedral polymer of C₆₀ respectively

a) 1  & Ferromagnetic           b)  1   &   Antiferromagnetic

c) 5 & Ferromagnetic            d) 5  &    Antiferromagnetic

Ans. (c)

Hints:

The C70 is a biproduct obtained during the synthesis of C60. C70 possesses five different types of carbon atoms in its structure, where as C60 has only one type of carbon. Thus C60 gives five ¹³C-NMR  resonance, where as C60 gives only one ¹³C-NMR resonance. The nature of rhombohedral polymer of C60 is Ferromagnetic.

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