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Question: Answered & Verified by Expert
The law of triad is applicable to a group of
ChemistryClassification of Elements and Periodicity in PropertiesJEE Main
Options:
  • A \( \mathrm{Cl}, \mathrm{Br}, \mathrm{I} \)
  • B \( \mathrm{C}, \mathrm{N}, \mathrm{O} \)
  • C \( \mathrm{Na}, \mathrm{K}, \mathrm{Rb} \)
  • D \( \mathrm{H}, \mathrm{O}, \mathrm{N} \)
Solution:
1788 Upvotes Verified Answer
The correct answer is: \( \mathrm{Cl}, \mathrm{Br}, \mathrm{I} \)

According to Dobereiner, the atomic weight of the middle element is nearly the same as the average atomic weights of the other two elements.

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