Q24 of 30 Page 1

Write the name, stereochemistry and magnetic behaviour of the following:

(Atomic No: Mn = 25, Co = 27, Ni = 28)


(i) K4[Mn(CN)6]


(ii) [Co(NH3)5Cl]Cl2


(iii) K2[Ni(CN)4]


(i) K4[Mn(CN)6] : The name of the given complex is Potassium hexacyanomanganate (II). It is Octahedral in shape. It is paramagnetic in nature due to the presence of unpaired electrons.


(ii) [Co(NH3)5Cl]Cl2: The name of the given complex is Pentaamminechloridocobalt(III) chloride. It is octahedral in shape. It is diamagnetic in nature as there is no unpaired electron in it.


(iii) K2[Ni(CN)4] : The name of the given complex is Potassium tetracyanonickelate(II). It is square planar in shape. It is diamagnetic in nature due to unavailability of unpaired electrons


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22

Describe the principle behind each of the following
processes:

i. Vapour phase refining of a metal.


ii. Electrolytic refining of a metal


iii. Recovery of silver after silver ore was leached with NaCN.


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Complete the following chemical equations:

(i) MnO4- + C2O42- + H+→


(ii) KMnO4


(iii) Cr2O72- + H2S + H+→


 25

Answer the following:

(i) Haloalkanes easily dissolves in organic solvents, why?


(ii)What is known as a racemic mixture? Give an example.


(iii)Of the two bromo-derivatives, C6H5CH(CH3)Br and C6H5CH( C6H5)Br, which one is more reactive in SN1 substitution reaction and why?


 26

(a) Explain why an alkylamine is more basic than ammonia?
(b) How would you convert:
(i) Aniline to nitrobenzene
(ii)Aniline to iodobenzene