d and f-Block Elements Test

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d and f-Block Elements Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Electronic configurations of different elements are given below in the options. Based on their electronic configurations, choose the one having the highest ionisation energy.

A
[Ar] 3d⁵ 4s¹

B
[Ar] 3d⁵ 4s²

C
[Ar] 3d⁷ 4s²

D
[Ar] 3d¹⁰ 4s²

Solution

[Ar] 3d¹⁰ 4s² is the electronic configuration of zinc.

Zinc has the highest ionisation energy among the elements of the 3d transition series as it has the highest effective nuclear charge and a stable electronic configuration of fully filled orbitals.
Question 2
1 / -0

Copper, in the aqueous solutions of its salts, almost invariably exists in the +2 oxidation state because

A
the second ionisation energy for copper is less than the first

B
the sum of the first two ionisation energies for copper is low

C
the enthalpy of hydration of Cu⁺² is greater than the enthalpy of hydration of Cu⁺

D
the electronic configuration of Cu⁺² is more stable than Cu⁺

Solution

Cu⁺² being smaller in size has a higher charge density and as a result, it has a higher heat of hydration, which more than compensates for the higher second ionisation energy of copper.

Whereas, the hydration energy for Cu⁺ is less and does not compensate for the high ionisation energy.
Question 3
1 / -0

Choose the correct statement(s) about manganese from among the following:

a. Mn³⁺ is a reducing agent in its aqueous solution.
b. The oxidation state of manganese in its fluoride is +4 (MnF₄).
c. The oxidation state of manganese is observed in its fluorides because the electronegativity of fluorine is the highest.

A
a and b

B
Only b

C
Only c

D
All of these

Solution

Statement (a) is incorrect as Mn³⁺ is a strong oxidising agent and is spontaneously reduced to Mn⁺²([Ar]3d⁴4s⁰) in its aqueous solution.
Statement (b) is correct as the highest oxidation state of manganese in MnF₄is +4.
Statement (c) is incorrect as the highest oxidation state of Mn is observed in its oxides because oxygen is capable of forming double bonds.
Question 4
1 / -0

To which of the following categories will the given reaction belong?

2Cu⁺→Cu + Cu²⁺

A
Oxidation

B
Displacement

C
Reduction

D
Disproportionation

Solution

Copper is getting both oxidised as well as reduced. Hence, the reaction involves disproportionation of copper.
Question 5
1 / -0

An aqueous solution of KCN is added to a solution of ferrous salt. The complex formed is presented by

A
[Fe(CN)₆]^4-

B
[Fe(CN)₆]^3-

C
[Fe(H₂O)₆]³⁺

D
[Fe(H₂O)₆]²⁺

Solution

Fe²⁺ + 6CN^- → [Fe(CN)₆]^4-
The complex ion formed is hexacyanoferrate(II).
Question 6
1 / -0

Some elements of 3d series are shown in the options. Choose the pair of elements with the highest and lowest melting points, respectively.

A
Cr and Zn

B
Mn and Cu

C
Cr and Cu

D
Mn and Zn

Solution

The metallic bond is strongest in Cr with six unpaired electrons and weakest in Zn with no unpaired electron.
Among the elements of the 3d-series, Cr has the highest melting point and Zn has the lowest melting point.
Question 7
1 / -0

A metal gives two chlorides X and Y. X gives black precipitate with NH₄OH and Y gives white. With KI, Y gives red precipitate, which is soluble in excess of KI. X and Y respectively are

A
Hg₂Cl₂ and HgCl₂

B
HgCl₂ and Hg₂Cl₂

C
HgCl₂ and ZnCl₂

D
ZnCl₂ and Hg₂Cl₂

Solution

(X) is mercurous chloride (Hg₂Cl₂) and Y is mercuric chloride (HgCl₂).
Hg₂Cl₂+ 2NH₄OH → Hg + NH₂HgCl (black ppt) + NH₄Cl + 2H₂O
HgCl₂ + 2KI → HgI₂ (red ppt) + 2KCl
HgI₂ + 2KI → K₂[HgI₄] (soluble)
K₂[HgI₄] is Nessler's reagent used for testing the presence of NH₃and proteins.

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d and f-Block Elements Test - 3

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d and f-Block Elements Test - 3

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Question 1

[Ar] 3d5 4s1

[Ar] 3d5 4s2

[Ar] 3d7 4s2

[Ar] 3d10 4s2

Solution

Question 2

the second ionisation energy for copper is less than the first

the sum of the first two ionisation energies for copper is low

the enthalpy of hydration of Cu+2 is greater than the enthalpy of hydration of Cu+

the electronic configuration of Cu+2 is more stable than Cu+

Solution

Question 3

a and b

Only b

Only c

All of these

Solution

Question 4

Oxidation

Displacement

Reduction

Disproportionation

Solution

Question 5

[Fe(CN)6]4-

[Fe(CN)6]3-

[Fe(H2O)6]3+

[Fe(H2O)6]2+

Solution

Question 6

Cr and Zn

Mn and Cu

Cr and Cu

Mn and Zn

Solution

Question 7

Hg2Cl2 and HgCl2

HgCl2 and Hg2Cl2

HgCl2 and ZnCl2

ZnCl2 and Hg2Cl2

Solution

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[Ar] 3d⁵ 4s¹

[Ar] 3d⁵ 4s²

[Ar] 3d⁷ 4s²

[Ar] 3d¹⁰ 4s²

the enthalpy of hydration of Cu⁺² is greater than the enthalpy of hydration of Cu⁺

the electronic configuration of Cu⁺² is more stable than Cu⁺

[Fe(CN)₆]^4-

[Fe(CN)₆]^3-

[Fe(H₂O)₆]³⁺

[Fe(H₂O)₆]²⁺

Hg₂Cl₂ and HgCl₂

HgCl₂ and Hg₂Cl₂

HgCl₂ and ZnCl₂

ZnCl₂ and Hg₂Cl₂