Question

Which of the following statement is not true about Doebereiner's Law of Triad?

• A. The law was applicable to all known elements
• B. Nitrogen family does not obey the law of triads
• C. Doebereiner's classification was not very useful
• D. The atomic mass of central element of each was merely the arithmetic mean of the atomic masses of other two elements.

Answer 1

The correct option is A The law was applicable to all known elements

Doebereiner's triads could find only some triads, but there were many more elements known at that time.
Therefore, Doebereiner's could not classify most of the elements known at that time.