NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions
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Question : 15
Total: 43
Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory :
(i)[ F e ( C N ) 6 ] 4 –
(ii)[ F e F 6 ] 3 –
(iii)[ C o ( C 2 O 4 ) 3 ] 3 –
(iv)[ C o F 6 ] 3 −
(i)
(ii)
(iii)
(iv)
Solution:
(i) [ F e ( C N ) 6 ] 4 – [ A r ] 4 s 2 3 d 6
Fe2 + [ A r ] 4 s 2 3 d 6
CN–
(ii)[ F e F 6 ] 3 – [ A r ] 4 s 2 3 d 6 . F e 3 + : [ A r ] 4 s 0 3 d 5 F [ C o ( C 2 O 4 ) 3 ] 3 – [ A r ] 4 s 2 3 d 7
C o 3 + : [ A r ] 4 s 0 3 d 6
C 2 O 4 2 – [ C o F 6 ] 3 − [ A r ] 4 s 2 3 d 7
C o 3 + : [ A r ] 4 s 0 3 d 6 .
F –
Fe
CN
It has octahedral shape and is diamagnetic in nature due to absence of electrons.
(ii)
(iii)
(iv)
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