JEE Main 2016 Chemistry question

Which of the following are the transition metal ions responsible for colour in ruby and emerald respectively?

(1) and
(2) and
(3) and Correct
(4) and

Answer: (3)

Solution

Both gemstones owe their colour to the **same** ion, , present as a trace impurity substituting for aluminium in an otherwise colourless host lattice — option (3). Ruby is corundum, , with a little chromium; emerald is beryl, ,

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Question ID VK-115634