Chemistry
Grade-9
Easy
Question
Which one of the following set of triads does NOT fit Dobereiner's Law of Triads?
- lithium, sodium, potassium
- calcium, strontium, barium
- phosphorus, arsenic, antimony
- chlorine, bromine, iodine
Hint:
Dobereiner had discovered 5 triads.
The correct answer is: phosphorus, arsenic, antimony
Dobereiner's triads are as follows:
Lithium, Sodium and Potassium.
Calcium, Strontium and Barium.
Chlorine, Bromine and Iodine.
Sulfur, Selenium and Tellurium.
Iron, Cobalt and Nickel.
Hence, phosphorus, arsenic, antimony is not a Dobereiner's triad.
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