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Railways PYQCBT 1 2016

RRB NTPC · Question 77

Which of the following is not true regarding symbols used in chemistry? A. These are short-hand notations used for naming chemical compounds. B. A symbol is made up of a single letter or two letters. C. This style of nomenclature was first used by James Chadwick and J.J. Thomson D. The symbol for Chlorine is Cl.

  1. A

  2. B

  3. C

  4. D

Show answer & explanation

Answer: (C) C

Explanation

Chemical symbols are one- or two-letter shorthand for elements (for example Cl for chlorine). The modern system of letter symbols was introduced by Jöns Jacob Berzelius around 1813, not by Chadwick and Thomson, so statement C is not true.