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JEE Advanced · 2010 · 11 Apr 2010 · Paper 2 · Classification of Elements and Periodicity

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Among the following, the number of elements showing only one non-zero oxidation state is
O,
C1,
F ,
N,
P,
Sn,
Tl,
Na,
Ti

Answer: 2

Solution

Elements showing only one non-zero oxidation state:
  • O: -2, -1, +2 (multiple)
  • Cl: -1, +1, +3, +5, +7 (multiple)
  • F: -1 only ✓
  • N: -3, +1, +2, +3, +4, +5 (multiple)
  • P: -3, +3, +5 (multiple)
  • Sn: +2, +4 (multiple)
  • Tl: +1, +3 (multiple)
  • Na: +1 only ✓
  • Ti: +2, +3, +4 (multiple)

Only F and Na show one non-zero oxidation state. Answer = 2.

JEE Advanced · 2010 · 11 Apr 2010 · Paper 2 · Integer answer

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