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Q.

 How many sets of triads did Dobereiner discover among the recognized elements?

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a

2

b

1

c

6

d

3

answer is B.

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Detailed Solution

During Dobereiner's period, only 53 elements were known. Only 3 sets of triads could be distinguished by Dobereiner among the known elements at the time.

The Doberiner's triads are:

1. Calcium, Strontium, and Barium

2. Nitrogen, Phosphorous and Arsenic

3. Chlorine, Bromine and Iodine

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