1.

Ruby is aluminium oxide (Al_(2)O_(3)) containing about 0.5-1% Cr^(3+) ions (d^(3)), which are randomly distributed in positions normally occupied by Al^(3+) choose the only incorrect statement :

Answer»

`Cr^(3+)` is incorporated into the alumina lattice as octahedral chromium (III) complexes
d-d transitions at these CENTRES give rise to colour
In Emarald, `Cr^(3+)` ions occupy octahedral sites in the mineral beryl `(Be_(3)Al_(2)Si_(6)O_(18))`
The ABSORPTION bands seen in the Emarlad, shift to longer wavelength, namely yellow-red and blue, causing Ruby to transmit light in green region.

Solution :(d) The absorption bonds seen in the Ruby, shift ot longer wavelength, namely yellow-red and blue, causing EMERALD ot transmit light in green region.


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