Identify the group which is not a Dobereiner triad
Identify the group which is not a Dobereiner triad

Q. Identify the group which is not a Dobereiner triad

A.            Li, Na, K       

B.            Be, Mg, Cr       

C.            Ca, Sr, Ba      

D.            Cl, Br, I

Answer: Be, Mg, Cr       
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