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Chemistry · 2022 · 3 marks
CBSE 2022 · Region 5 · Set 1 · Q7
(a) Write any two consequences of Lanthanoid Contraction. (b) Name the element of 3d series which exhibits the largest number of oxidation states.…
(a)
Write any two consequences of Lanthanoid Contraction.
(b)
Name the element of 3d series which exhibits the largest number of oxidation states. Give reason.
Marking-scheme solution
(a) (i) Similarity in the size of the atoms of the elements belonging to same group of \(\displaystyle 2^{\text {nd }} / 4 \mathrm{~d}\) and \(\displaystyle 3^{\text {rd }} / 5 \mathrm{~d}\) transition series / the second and the third \(\displaystyle d\) series exhibit similar atomic / ionic radii.
(ii) Difficulty in separation of Lanthanoids in pure state.
(iii) Similar physical and chemical properties.
(iv) Basic character of the lanthanide hydroxides \(\displaystyle \mathrm{M}(\mathrm{OH})_{3}\) decreases with increase in atomic number.
(b) Mn, it has maximum number of unpaired electrons / It has maximum number of electrons that will participate in bonding.
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