Which of the following triads does not follow Dobereiner's law of triads?

Li, Na, K

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Ca, Sr, Ba

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Be, Mg, Ca

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Cu, Ag, Au

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Solution

The correct option is D Cu, Ag, Au
Since the atomic weight of Ag is not equal to the mean of the atomic weights of Cu and Au.

Thus, (Cu, Ag, Au) triad do not follow Dobereiner's law of triads.

Option D is correct.

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