d- and f- Block Elements  MCQs

MCQs of d- and f- Block Elements

Showing 101 to 110 out of 158 Questions
8 9 10 11 12 13
101.
When dilute H2SO4 is added to aqueous solution of potassium chromate, yellow colour changes to orange. This indicates _____ .
(a) chromate ion undergoes reduction
(b) chromate ion undergoes oxidations
(c) monocentred complex is converted into dicentred complex
(d) oxygen is removed from chromate ion
Answer:

Option (c)

102.
When MnO2 is fused with KOH, a coloured compound is formed. State the product and colour.
(a) K2MnO4, dark green
(b) KMnO4, violet
(c) Mn2O3, brown
(d) Mn3O4, black
Answer:

Option (a)

103.
State the correct order of strength as an oxidizing agent.
(a) VO2+ < Cr2O7-2 < MnO4-
(b) Cr2O7-2 < VO2+ < MnO4-
(c) Cr2O7-2 < MnO4- < VO2+
(d) MnO4- < Cr2O7-2 < VO2+
Answer:

Option (a)

104.
What is the colour of K2MnO4 ?
(a) green
(b) blue
(c) red
(d) violet
Answer:

Option (a)

105.
Which of the following statement is incorrect for KMnO4 ?
(a) It is an oxidizing agent.
(b) It is used as bleaching agent in textile industries.
(c) It is used as antiseptic.
(d) It is dark purple coloured amorphous substance.
Answer:

Option (d)

106.
The colour of KMnO4 is due to _____ .
(a) M → L charge transfer transition
(b) d - d transition
(c) L → M charge transfer transition
(d) σ - σ* transition
Answer:

Option (c)

107.
Innertransition elements are members of which period ?
(a) Fifth and sixth
(b) Sixth and seventh
(c) Fourth and fifth
(d) Fifth and seventh
Answer:

Option (b)

108.
Which of the following ions displays the tendency of an oxidizing agent ?
(a) Ce4+
(b) Lu3+
(c) Sm2+
(d) Gd3+
Answer:

Option (a)

109.
Which of the following is the least basic ?
(a) Nd(OH)3
(b) Yb(OH)3
(c) Ce(OH)3
(d) Gd(OH)3
Answer:

Option (b)

110.
State the descending order of basic strength (or basicity).
(a) Pm(OH)3 < Yb(OH)3 < Ce(OH)3 < Nd(OH)3
(b) Yb(OH)3 < Pm(OH)3 < Pr(OH)3 < Ce(OH)3
(c) Nd(OH)3 < Pr(OH)3 < Ce(OH)3 < Yb(OH)3
(d) Eu(OH)3 < Tb(OH)3 < Sm(OH)3 < Ln(OH)3
Answer:

Option (b)

Showing 101 to 110 out of 158 Questions
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