Topic: d and f Block Elements, Test No.: 03, Total MCQs: 10
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Question 1 |
Least
paramagnetic property is shown by
Fe | |
Mn | |
Ni | |
Cu |
Question 2 |
In blast
furnace, iron oxide is reduced by
Hot blast of air | |
Carbon monoxide | |
Carbon | |
Silica |
Question 3 |
In chromite
ore, the oxidation number of iron and chromium are respectively
+3, +2 | |
+3, +6 | |
+2, +6 | |
+2, +3 |
Question 4 |
Identify the
reaction that does not take place in a blast furnace.
CaCO3
¾®
CaO + CO2 | |
CaO + Si O2
¾®
Ca Si O2 ¾® Ca Si O3 | |
2Fe2O3
+ 3C ¾®
4Fe + 3CO2 | |
CO2 +
C ¾®
2CO |
Question 5 |
In context of
the lanthanoids, which of the following statements is not correct?
Availability of 4 f electrons results in the formation of compounds in +4 state for all the members of the series | |
There is a gradual decrease in the radii of the members with increasing atomic number in the series | |
All the members exhibit +3 oxidation state | |
Because of similar properties the separation of lanthanoids is not easy |
Question 6 |
In the
electrolytic refining of Zinc, ______.
the impure metal is at the cathode. | |
graphite is at the anode. | |
acidified zinc sulphate is the electrolyte. | |
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?
Ferrous oxide is more basic in nature than the ferric oxide | |
Ferrous compounds are relatively more ionic than the corresponding ferric compounds | |
Ferrous compounds are less volatile than the corresponding ferric compounds | |
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?
The ionic sizes of Ln (III) decrease in general with increasing atomic number | |
Ln (III) compounds are generally colourless | |
Ln (III) hydroxides are mainly basic in character | |
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
the appreciable shielding on outer electrons by 4f electrons from the nuclear charge | |
the appreciable shielding on outer electrons by 5d electrons from the nuclear charge | |
the same effective nuclear charge from Ce to Lu | |
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
4f orbitals more diffused than the 5f orbitals | |
lesser energy difference between 5f and 6d than between 4f and 5d orbitals | |
more energy difference between 5f and 6d than between 4f and 5d orbitals | |
more reactive nature of the actinoids than the lanthanoids |
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