d and f Block Elements MCQs | Question – Paper 3


Topic: d and f Block Elements, Test No.: 03, Total MCQs: 10

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Question 1
Least paramagnetic property is shown by
A
Fe
B
Mn
C
Ni
D
Cu
Question 2
In blast furnace, iron oxide is reduced by
A
Hot blast of air
B
Carbon monoxide
C
Carbon
D
Silica
Question 3
In chromite ore, the oxidation number of iron and chromium are respectively
A
+3, +2
B
+3, +6
C
+2, +6
D
+2, +3
Question 4
Identify the reaction that does not take place in a blast furnace.
A
CaCO3 ¾® CaO + CO2
B
CaO + Si O2 ¾® Ca Si O2 ¾® Ca Si O3
C
2Fe2O3 + 3C ¾® 4Fe + 3CO2
D
CO2 + C ¾® 2CO
Question 5
In context of the lanthanoids, which of the following statements is not correct?
A
Availability of 4 f electrons results in the formation of compounds in +4 state for all the members of the series
B
There is a gradual decrease in the radii of the members with increasing atomic number in the series
C
All the members exhibit +3 oxidation state
D
Because of similar properties the separation of lanthanoids is not easy
Question 6
In the electrolytic refining of Zinc, ______.
A
the impure metal is at the cathode.
B
graphite is at the anode.
C
acidified zinc sulphate is the electrolyte.
D
the metal ion gets reduced at the anode.
Question 7
Iron exhibits +2 and + 3 oxidation states. Which of the following statements about iron is incorrect?
A
Ferrous oxide is more basic in nature than the ferric oxide
B
Ferrous compounds are relatively more ionic than the corresponding ferric compounds
C
Ferrous compounds are less volatile than the corresponding ferric compounds
D
Ferrous compounds are more easily hydrolyzed than the corresponding ferric compounds.
Question 8
Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?
A
The ionic sizes of Ln (III) decrease in general with increasing atomic number
B
Ln (III) compounds are generally colourless
C
Ln (III) hydroxides are mainly basic in character
D
Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character
Question 9
Lanthanide contraction is caused due to
A
the appreciable shielding on outer electrons by 4f electrons from the nuclear charge
B
the appreciable shielding on outer electrons by 5d electrons from the nuclear charge
C
the same effective nuclear charge from Ce to Lu
D
the imperfect shielding on outer electrons by 4f electrons from the nuclear charge
Question 10
Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being
A
4f orbitals more diffused than the 5f orbitals
B
lesser energy difference between 5f and 6d than between 4f and 5d orbitals
C
more energy difference between 5f and 6d than between 4f and 5d orbitals
D
more reactive nature of the actinoids than the lanthanoids
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