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P-1 Periodic Classification of Element — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceP-1 Periodic Classification of Element1 Mark
Question
Why was Dobereiner's classification of elements not useful?
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Answer

Dobereiner's Triad was not useful for classification of elements because he could identify only some triads from the known elements as other triads did not obey Dobereiner's rule.

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