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Question : 33
Total: 35
SECTION - E
(a) (I) Account for the following: (i)
(ii)
(iii) Actinoids show wide range of oxidation states.
(II) Write the chemical equations for the preparation of
OR(b) (I) Account for the following:
(i) Transition metals form alloys.
(ii)
(II) Write one similarity and one difference between chemistry of Lanthanoids and Actinoids.
(III)Complete the following ionic equation:
Solution: 👈: Video Solution
(a) (I) (i) Because M n 3 + 3 d 4 & M n 2 + 3 d 5
However in case ofC r 3 + ∕ C r 2 + 3 d 3 3 d 4
(ii) Due to absence of unpaired electronS c 3 + T i 3 +
(iii) It is due to comparable energies of5 f , 6 d 7 s
(II)2 M n O 2 + 4 K O H + O 2
2 K 2 M n O 4 + 2 H 2 O
3 K 2 M n O 4
2 K M n O 4 + M n O 2 + 2 H 2 O + 4 K C l
OR (b) (I) (i) The atomic radii of the transition elements in any series are not much different from each other.
As a result they can very easily replace each other in the lattice and form alloys.
(ii)C e 4 + C e + 4
(II) In case of lanthonoids, differentiating electron enters in4 f 5 f
They both have( 3 + )
(III)C r 2 O 7 2 − + 2 O H − ─ ─ ─ ─ ▸ 2 C r O 4 2 − + H 2 O
However in case of
(ii) Due to absence of unpaired electron
(iii) It is due to comparable energies of
(II)
OR (b) (I) (i) The atomic radii of the transition elements in any series are not much different from each other.
As a result they can very easily replace each other in the lattice and form alloys.
(ii)
(II) In case of lanthonoids, differentiating electron enters in
They both have
(III)
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