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Ruby crystals have a deep red colour and are well known for their use in jewellery. Not many people know that the heart of the first laser, built in 1960 by Maiman was a big ruby crystal. The red colour of ruby originates from the absorption of light by chromium atoms that are incorporated in colourless aluminium oxide crystals by replacing aluminum
Indicate What will happen with the ruby, when kept in a balance where magnet is kept directly under the side with the ruby

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The magnet repels the ruby (the ruby moves up)

The magnet has no influence on the ruby (the ruby does not move)

The magnet has an oscillating effect on the ruby (the ruby moves up and down)

The magnet attracts the ruby (the ruby moves down)

answer is A.

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$C r^{3 +}$ contains 3 unpaired electrons and is paramagnetic

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