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GK QUESTION#3165

Which of the following pairs of 'elements - valency' is correct? I. Boron - 2 II. Fluorine - 3

  1. ANeither I nor IICorrect answer
  2. BBoth I and II
  3. COnly II
  4. DOnly I
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Answer

A. Neither I nor II

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Explanation

In the usual introductory valency convention, boron has valency 3 and fluorine valency 1. Neither proposed pair is correct. Valency is a combining capacity; signed oxidation numbers should not be substituted for it without specifying a convention.

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