Chemistry of Lanthanide elements MCQ-B.Sc. Second year (UG degree course) Semester Fourth, Inorganic chemistry paper-X

B.Sc. Second year Undergraduate degree course Semester Fourth Inorganic chemistry paper X

Chapter-  Chemistry of Lanthanide elements, Objective questions

1. Which is the last element of lanthanides?

a) Ytterbium  b) Lutetium  

 c) Thulium     d) Erbium

2. Which of the following is the correct order of arrangement of the first five lanthanides according to atomic number?

a) La, Ce, Pr, Nd, Pm    b) La, Pr, Ce, Pm, Nd   

   c) La, Pr, Ce, Nd, Pm    d) La, Ce, Pr, Pm, Nd

 3. Which of the following lanthanide ions do not exhibit color?

a) Lu⁺³ and Ln⁺³     b) Lu⁺² and Ln⁺²      

  c) Ce⁺³ and Ce⁺³      d) Pr⁺⁴ and Ce⁺⁴

4. Which of the following is not a property of lanthanides?
a) They are soft metals with white silvery color
b) They tarnish rapidly by air
c) The hardness of the metals increases with increase in the atomic number
d) The melting point of the metal ranges from 500-1000K

 

5. What is the most common oxidation state of lanthanides?
a) +2
b) +4
c) +6
d) +3

 

6. Which of the following is not a consequence of lanthanide contraction?
a) From La⁺³ to Lu⁺³, the ionic radii changes from 106 pm to 85 pm
b) As the size of the lanthanide ions decreases the basic strength increases
c) The basic character of oxides and hydroxides decreases with increase in atomic number
d) The atomic radii of 4d and 5d series is similar

 

7. What happens to the atomic size of the lanthanides with increase in atomic number?
a) The radius remains unchanged
b) The radius decreases
c) The radius increases
d) The radius first increases and then decreases

 

8. Which of the following lathanoide ion is diamagnetic (At. no. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

a) Ce⁺²

b) Sm⁺²

c) Eu⁺²

d) Yb⁺²

9. 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

 

10. 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 4f 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

11. Most common oxidation state of lanthanide series is

a)      +2

b)     +3

c)      +4

d)     +1

12. In aqueous solution, Eu⁺² ion acts as

a) Oxidizing agent

b) Reducing agent

c) both a and b

d) None of these

13. Among the lanthanides the one obtained by synthetic method is:

a) Lu

b) Pm

c) Pr

d) Gd

14. Across the lanthanide series, the basicity of the lanthanide hydroxides:

a) Increases

b) Decreases

c) First increases and then decreases

d) First decreases and then increases

 

15. The reason for the stability of Gd³⁺ ion is

a) 4f subshell- half filled

b) 4f subshell completely filled

c) Possesses the general electronic configuration of noble gases

d) 4f subshell empty

 

16. The most common oxidation states shown by cerium are

a) +2,+4

b) +3, +4

c) +3, +5

d) +2, +3

 

17. The +3 ion of which one of the following has half filled 4f subshell?

a) La

b) Lu

c) Gd

d) Ac

 

18. A reduction in atomic size with increase in atomic number is a characteristic of elements of

a) d-block

b) f-block

c) Radioactive series

d) High atomic masses

 

19. Which of the following lanthanide ion is paramagnetic?

a) Ce⁴⁺

b) Yb ²⁺

c) Lu ³⁺

d) Eu ²⁺

20. The outer electronic configuration of Gd ( At.No.=64) is

a) 4f³ 5d⁵ 6s²

b) 4f⁸ 5d⁰ 6s²

c) 4f⁴ 5d⁴ 6s²

d) 4f⁷ 5d¹ 6s^2ions

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