Anomalous pair among the following is :

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Cobalt – Nickel

Aluminium – Gallium

Boron – Silicon

Beryllium – Indium

answer is D.

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Detailed Solution

An anomalous pair is a pair of elements where the mass of the first element is higher than the second element in the pair. Thus, among the given options, cobalt-nickel is an anomalous pair. This was one of the drawbacks of Mendeleev's periodic table.

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