Q23 of 47 Page 1

a. Give one chemical test as an evidence to show that [Co(NH3)5CI]SO4 and [Co(NH3)5(SO4)]CI are ionisation isomers.

b. [NiCL4]2- is paramagnetic while [Ni(CO)4] is diamagnetic though both are tetrahedral. Why? (Atomic no. of Ni = 28)


c. Write the electronic configuration of Fe(III) on the basis of crystal field theory when it forms an octahedral complex in the presence of


i. strong field ligand, and


ii. weak field ligand.
(Atomic no. of Fe = 26)


a. On addition of silver nitrate, [Co(NH3)5 (SO4)] Cl will form white precipitate of AgCl while [Co(NH3)5CI]SO4does not. This shows that chloride ion is inside the coordination sphere in [Co(NH3)5CI]SO4 and thus the given two complexes are ionisation isomers.


b. In [Ni(CO)4], Ni is in zero oxidation state whereas [NiCl4]2-, it is in +2 oxidation state. In the presence of CO ligand the unpaired d electrons of nickel pair up but Cl- being a weak ligand is unable to pair up the unpaired electrons. So, [NiCl4]2- is paramagnetic while [Ni(CO)4] is diamagnetic though both are tetrahedral.


c. The electronic configuration of Fe(III) on the basis of crystal field theory when it forms an octahedral complex:


i. In the presence of strong field ligand: t2g5 eg0


ii. In the presence of weak field ligand: t2g3 eg2


More from this chapter

All 47 →
21

a. Out of and which one is more reactive towards SN2 reaction and why?

b. Out of and Which one is more reactive towards nucleophilic substitution reaction and why?


c. Out of and which one is optically active and why?


 22

What happens when

a. Salicylic acid is treated with (CH3CO)2 O/H+?


b. Phenol is oxidised with Na2Cr2O7/H+?


c. Anisole is treated with CH3Cl/anhydrous AlCl3?
Write chemical equation in support of your answer.


 24

Define the following terms with a suitable example of each :

a. Anomers


b. Essential amino acids


c. Denaturation of protein


 25

a. Define order of reaction. How does order of a reaction differ from molecularity for a complex reaction?

b. A first order reaction is 50% complete in 25 minutes. Calculate the time for 80% completion of the reaction.


OR


a. The decomposition of a hydrocarbon has value of rate constant as 2.5 × 104 s-1 at 27oC. At what temperature would rate constant be7.5 × 104 s-1 if energy of activation is 19.147 × 103 J mol-1?


b. Write a condition under which a bimolecular reaction is kinetically first order. Give an example of such a reaction.
(Given: log 2 = 0.3010, log 3 = 0.4771, log 5 = 0.6990)