How many of the following sets represent Döbereiner's triads? 1. P, As, Bi 2. Ca, Sr, Ba 3. Cl, Br, I 4. Li, Na, K

JEE Main Chemistry question

How many of the following sets represent Döbereiner's triads? 1. 2. 3. 4.

Answer: 3

Solution

In a Döbereiner triad, the atomic mass of the middle element is approximately the average of the other two. Set 1 (): average of P & Bi , so not a valid triad. Set 2

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Question ID VK-133904