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Question : 12
Total: 12
SECTION - D
(a) A transition element (b) Complete the reaction mentioning all the products formed:
(c) Account for the following
(i) In the 3d transition series, zinc has the lowest, enthalpy of atomisation.
(ii)
(iii) Actinoids show more number of oxidation states than lanthanoids.
Solution: 👈: Video Solution
(a) The X
Its electronic configuration is [Ar]3 d 3 4 s 2
Likely oxidation state:+ 2 , + 3 , + 4 , + 5
(b)2 K M n O 4
K 2 M n O 4 + M n O 2 + O 2 ↑
(c) (i)Z n = 30 [ A r ] 4 s 2 3 d 10
The d-orbital is fully filled in zinc (Zn). There is no unpaired electrons are available. Inter atomic bonding is weak because of which metallic bonding is also weak.
(ii)C u = [ A r ] 3 d 9 4 s 2
= 3 d 10 4 s 1
In aqueous medium it exist asC u + e − C u 2 +
2 C u 2 + ─ ─ ─ ▸ C u 2 + + C u
(iii) Actinoids are radioactive in nature. They have almost similar enthalpy of actinides. Therefore, they shows more actinoids contraction than lanthinoids contraction. They have more poor shielding of5 f 4 f
Its electronic configuration is [Ar]
Likely oxidation state:
(b)
(c) (i)
The d-orbital is fully filled in zinc (Zn). There is no unpaired electrons are available. Inter atomic bonding is weak because of which metallic bonding is also weak.
(ii)
In aqueous medium it exist as
(iii) Actinoids are radioactive in nature. They have almost similar enthalpy of actinides. Therefore, they shows more actinoids contraction than lanthinoids contraction. They have more poor shielding of
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