XII_CS_TERM_II(1).pdf
5.6 MB
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Q1:-Which of the following is the correct order of arrangement of the first five lanthanides according to atomic number?
Anonymous Quiz
32%
a) La, Ce, Pr, Nd, Pm
28%
b) La, Pr, Ce, Pm, Nd
23%
c) La, Pr, Ce, Nd, Pm
17%
d) La, Ce, Pr, Pm, Nd
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Q2:-Which of the following is not a property of lanthanides?
Anonymous Quiz
34%
a) They are soft metals with white silvery color
33%
b) They tarnish rapidly by air
34%
c) The melting point of the metal ranges from 500-1000K
Q3:-What is the general electronic configuration of the lanthanides?
Anonymous Quiz
18%
a) (n-2)f 1-14 (n-1)d 1-10 ns2
42%
b) (n-2)f 1-14 (n-1)d 1-2 ns2
32%
c) (n-2)f 1-14 (n-1)d 0-1 ns2
9%
d) (n-2)f 1-14 (n-1)d 0 ns2
Q4:-What is the most common oxidation state of lanthanides?
Anonymous Quiz
27%
a) +2
43%
b) +4
19%
c) +6
11%
d) +3
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Q5:-Which of the following lanthanide ions do not exhibit color?
Anonymous Quiz
37%
a) Lu+3 and Ln+3
31%
b) Lu+2 and Ln+2
23%
c) Ce+3 and Ce+3
9%
d) Pr+4 and Ce+4
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