Colour of Ruby stone is due to ........ ion

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Cr³⁺

Mn²⁺

Co²⁺

Cu²⁺

answer is D.

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Detailed Solution

A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide).... Ruby is one of the traditional cardinal gems, together with amethyst, sapphire, emerald, and diamond. The word ruby comes from ruber, Latin for red. The color of a ruby is due to the element Cr⁺³

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