21. Which of the following triads does not follow Dobereiner's law of triads ? (D) Cu, Ag, Au (A) Li, Na, K (B) Ca, Sr, Ba (C) Be, Mg, Ca
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A is the correct answer i think soo
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Answer:
A) Cu Ag Au does not follow dobereiners law of traid
Explanation:
The mass of middle element is not equal to avg of remaining elememts
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