IIT-JEE 2012 · Paper 1 · Chemistry Q26

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ChemistrySingle correct+3 / -1Question 26 of 60

The colour of light absorbed by an aqueous solution of $\ce{CuSO4}$ is

orange-red

blue-green

yellow

violet

Answer and worked solution

Official answer: A

Complementary colours. Aqueous $\ce{CuSO4}$ contains $\ce{[Cu(H2O)6]^{2+}}$ and looks blue. The colour seen is the complement of the colour absorbed: it absorbs in the orange-red region (around 600-800 nm).

(A)

Topics:Magnetic properties and colour

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IIT-JEE 2012 · Paper 1, Chemistry question 26