d and f Block Elements MCQs | Question – Paper 4

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Topic: d and f Block Elements, Test No.: 04, Total MCQs: 10

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Question 1
The outer electron configuration of Gd (Atomic number: 64) is:
A
4f3 5d5 6s2
B
4f8 5d0 6s2
C
4f4 5d4 6s2
D
4f7 5d1 6s2
Question 2
The oxidation number of Mn in the product of alkaline oxidative fusion of MnO2 is
A
2
B
3
C
4
D
6
Question 3
The ground state electronic configuration of CO molecule is
A
1s22s21p43s2
B
1s22s23s21p22p2
C
1s22s21p23s22p2
D
1s21p42s23s2
Question 4
The increasing order of the ionic radii of the given isoelectronic species is:
A
Cl–, Ca2+, K+, S2–
B
S2– , Cl–, Ca2+, K+
C
Ca2+, K+ , Cl– , S2–
D
K+, S2–, Ca2+, Cl–
Question 5
Mercury is a liquid metal because
A
it has a completely filled s-orbital
B
it has a small atomic size
C
it has a completely filled d-orbital that prevents d-d overlapping of orbitals
D
it has a completely filled d-orbital that causes d-d overlapping
Question 6
Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?
A
(n – 1) d8 ns2
B
(n – 1) d5 ns1
C
(n – 1) d3 ns2
D
(n – 1) d5 ns2
Question 7
The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because
A
the 5f orbitals are more buried than the 4f orbitals
B
there is a similarity between 4f and 5f orbitals in their angular part of the wave function
C
the actinoids are more reactive than the lanthanoids
D
the 5f orbitals extend further from the nucleus than the 4f orbitals
Question 8
The bonds present in the structure of dichromate ion are
A
four equivalent Cr – O bonds only
B
six equivalent Cr – O bonds and one O – O bond
C
six equivalent Cr – O bonds and one Cr – Cr bond
D
six equivalent Cr – O bonds and one Cr – O – Cr bond
Question 9
The correct order of values with negative sign for the four successive elements Cr, Mn, Fe and Co is
A
Cr > Mn > Fe > Co
B
Mn > Cr > Fe > Co
C
Cr > Fe > Mn > Co
D
Fe > Mn > Cr > Co
Question 10
The methods chiefly used for the extraction of lead and tin from their ores are respectively
A
self reduction and carbon reduction
B
self reduction and electrolytic reduction
C
carbon reduction and self reduction
D
cyanide process and carbon reduction
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