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Q.

How many triads could Dobereiner identify from the elements known at that time?

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a

2

b

3

c

4

d

5

answer is C.

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Detailed Solution

Dobereiner’s triads could find only three triads; .i.e total of 9 elements only but there were many more elements known at that time.
1) Li, Na, K
2) Ca, Sr, Ba
3) K, Ba, I

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