f – Block Elements ONLINE MCQ TEST

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Set- 1       Set -2      Set- 3       Set -4        Set- 5       Set -6         Set-7       Set -8       Set- 9       Set -10

Set -1

1. The oxide used in gas lamp material is
MnO2
CeO2
N2O5
Fe2O3


2. Elements that form oxocations are
Lanthanides
Actinides
Noble gases
Alkali / base metals


3. __________ is the oxidation state of U in UF6
+ 6
+ 4
+ 3
0


4. According to Fajan’s rule, decrease in size of Ln³⁺ ion in Ln(OH)3
increases the covalent character
decreases the covalent character
increases the basic character
increases the ionic character


5. Alloys of Lanthanides are called as
Misch metals
Metalloids
Plate metal
None of these


6. Among the Lanthanides, with the increase in atomic number the tendency to act as reducing agent
increases
decreases
no change
none of these


7. Ceria / CeO2 is used in
toys
tracer bullets
gas lamp material
none of these


8. Lanthanide contraction is due to
perfect shielding of 3d electron
imperfect shielding of 3d electron
perfect shielding of 4f electron
imperfect shielding of 4f electron


9. Maximum oxidation state exhibited by Lanthanides is
+ 3
+ 4
+ 6
+ 7


10. The (most) common oxidation state of lanthanides is
+ 2
+ 3
+ 4
+ 6


11. The elements in which extra electron enter (n – 2) f orbital are
s - block elements
p - block elements
d - block elements
f - block elements


12. The fuel used in nuclear power plant is
Copper
Lead
Uranium
Radium


13. Which isotope is used as a power source in long mission space probes is?
U–235
Pu–235
Pu–238
U–238


14. The radioactive element of lanthanide is
Cerium
Promethium
Gadolinium
Lutetium


15. ThO2 / Thoria is used in
toys
tracer bullets
 gas lamp material
 dyeing cotton


16. Which is used in Gas lamp materials?
 Ceria
 Thoria
Mish metal
Both (a) & (b)


17. Lanthanides are extracted from
 Limonite
Monazite
Magnetite
Cassiterite


18. Lanthanides are separated by
Fractional distillation
 Steam distillation
Fractional Crystallisation
Sublimation


19. Metallothermic processes involving Lanthanides are called as
Aluminothermic process
Lanthanido-thermic process
 Reduction process
Oxidation process


20. The electronic configuration of Lanthanides is
[Xe]4f0 5d0 6s0
[Xe] 4f1–7 5d1 6s1
[Xe]4f1–14 5d1 6s2
[Xe]4f1–14 5d1–10 6s2


21. The electronic configuration of Actinides is
[Rn]5f0–14 6d0 7s0
[Rn]5f0–14 6d0–2 7s0
[Rn]5f0–14 6d0–2 7s1
[Rn]5f0–14 6d0–2 7s2


22. The lanthanide contraction is responsible for the fact that
Zn and Y have about the same radius
Zr and Nb have similar oxidation state
Zr and Hf have about the same radius
Zr and Zn have the same oxidation state


23. Which of the following is a radioactive lanthanide
Pu
Ac
Th
Pm


24. The long mission space probes use as power source____________
Pu
Pm
Th
U


25. The most common oxidation state of actinide is
+ 2
+ 1
+ 3
+ 4


26. Which of the following lanthanides have no partly filled 4f sub-shell but have electrons in 5d
Ce
Lu
Pm
Nd


27. The oxidation state of Uranium in UO2Cl2 is
+ 2
+ 4
+ 5
+ 6


28. Important ore of lanthanides is :
Pitch blende
Monozite
Gypsum
Chormite


29. Actinide contraction is due to
perfect shielding of 5f electron
imperfect shielding of 4f electron
imperfect shielding of 5f electron
perfect shielding of 4f electron


30. __________ is used in cigarette lighters
Mish metal
CeO2
Mg- alloys
pyrophoric alloy


31. The major constituents of Mish metals are
Ce, Nd, Th
Th, Ac, Ce
Ce, La, Nd
Ce, Lr, U


32. ________________ element is used as fuel in nuclear power plant.
U-236
Pu-238
U-235
Pu-235


33. Which Mg alloy is used in making parts of jet engines?
3% Mishmetal and 0.1% Zr
30% Mishmetal and 1% Zr
30% Mishmetal and 0.1% Zr
3% Mishmetal and 1% Zr

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