d- and f- Block Elements  MCQs

MCQs of d- and f- Block Elements

Showing 121 to 130 out of 158 Questions
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121.
In Cu and K both elements 4s1 configuration is present. Still the value of ΔiH1 of Cu is greater than that of K. This is because its 3d-orbitals cause _____ .
(a) strong shielding effect, increases atomic volume of Cu
(b) strong shielding effect, decreases atomic volume of Cu
(c) weak shielding effect, increases atomic volume of Cu
(d) weak shielding effect, decreases atomic volume of Cu
Answer:

Option (d)

122.
Yellow colour of CrO42- ion become orange in acidic medium. The reason is _____ .
(a) CrO2 is formed
(b) Cr2O3 is formed
(c) Cr2O72- is formed
(d) CrO42- solution becomes dilute
Answer:

Option (c)

123.
When K2Cr2O7 is heated with aqueous solution of a chloride like KCl in presence of concentration H2SO4 _____ .
(a) Cl- ions are oxidized to Cl2
(b) solution becomes green as Cr2O72- is changed into Cr3+ ion
(c) reddish brown vapour of CrO2Cl2 is produced
(d) CrCl3 is formed.
Answer:

Option (c)

124.
The action of Zn with dilute and concentrated nitric acid, respectively produces _____ .
(a) NO2 and NO
(b) NO and N2O
(c) NO2 and N2O
(d) N2O and NO2
Answer:

Option (d)

125.
Which of the following compounds does not possess primary valency ?
(a) K2Cr2O7
(b) CuSO4·5H2O
(c) FeSO4·7H2O
(d) (NH4)2SO4·FeSO4·6H2O
Answer:

Option (a)

126.
Galvanisation is applying a coating of _____ .
(a) Cr
(b) Cu
(c) Zn
(d) Pb
Answer:

Option (c)

127.
One transition element has electronic configuration [Ar] 3d6 in its (+2) oxidation state, then what will be its atomic number ?
(a) 22
(b) 24
(c) 25
(d) 26
Answer:

Option (d)

128.
Which of the following elements possesses d10 type electronic configuration ?

(i) Cu (ii) Zn (iii) Pd (iv) Au

(a) Only (i) and (ii)
(b) Only (i) and (iv)
(c) Only (i), (ii) and (iv)
(d) All the given
Answer:

Option (d)

129.
Which of the following species possesses [Kr] 4d105s0 electronic configuration ?

(i) Pd (ii) Ag+ (iii) Cd2+ (iv) Ag2+

(a) Only (i) and (ii)
(b) Only (ii) and (iii)
(c) Only (i),(ii) and (iii)
(d) All the given
Answer:

Option (c)

130.
The electronic configuration of which of the following ions have similar electronic configuration of inert gas elements ?

(i) Sc3+, Ti4+ (ii) Sc3+, Cr6+

(iii) Y3+, Mo6+ (iv) Zr4+, Nb3+

(a) Only (i) and (ii)
(b) Only (i) and (iii)
(c) Only (ii) and (iii)
(d) All the given
Answer:

Option (c)

Showing 121 to 130 out of 158 Questions
10 11 12 13 14 15