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The d-and f-Block Elements

Some Important Compounds of Transition Elements

Account for the following : (i) Copper (I) compounds are white

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Solving time: 2 mins

Account for the following :
(i) Copper (I) compounds are white whereas Copper (II) compounds are coloured.
(ii) Chromates change their colour when kept in an acidic solution.
(iii) $Zn, Cd, Hg$ are considered as d-block elements but not as transition elements.
(b) Calculate the spin-only moment of $Co^{2 +} (Z = 27)$ by writing the electronic configuration of $Co$ and $Co^{2 +}$ .

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Exam:

Class 12th Board 2020

Text solutionVerified

(i)

Cu^{+ 1} (3 d^{10})

compounds are white because of absence of unpaired electrons while

Cu^{+ 2} (3 d^{9})

compounds are coloured due to unpaired

e^{-} /

shows

d -

d

transition.
(ii) chromate

(CrO_{4}^{2 -})

changes to dichromate

(Cr_{2} O_{7}^{2 -})

ion in acidic medium.
(iii)due to completely filled d-orbitals in their ground state as well as in oxidized state.
(b)

Co = [Ar] 4 s^{2} 3 d^{7}, Co^{+ 2} = [Ar] 3 d^{7} μ = n (n + 2) = 3 (3 + 2) = 15 = 3.92 B.M.

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Account for the following :
(i) Copper (I) compounds are white whereas Copper (II) compounds are coloured.
(ii) Chromates change their colour when kept in an acidic solution.
(iii)

Zn, Cd, Hg

are considered as d-block elements but not as transition elements.
(b) Calculate the spin-only moment of

Co^{2 +} (Z = 27)

by writing the electronic configuration of

Co

and

Co^{2 +}

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Question Text	Account for the following : (i) Copper (I) compounds are white whereas Copper (II) compounds are coloured. (ii) Chromates change their colour when kept in an acidic solution. (iii) $Zn, Cd, Hg$ are considered as d-block elements but not as transition elements. (b) Calculate the spin-only moment of $Co^{2 +} (Z = 27)$ by writing the electronic configuration of $Co$ and $Co^{2 +}$ .
Topic	The d-and f-Block Elements
Subject	Chemistry
Class	Class 12
Answer Type	Text solution:1
Upvotes	89

Text solutionVerified

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