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Chemistry
9th -
12thgrade
3.2.5.4 Formation of coloured ions (A-level only)
2 questions
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- 1. Multiple Choice
A solution absorbs light with wavelengths corresponding to red, yellow and green light.
Which ion is most likely to be in the solution?
Cr2O72−(aq)
Fe2+(aq)
Fe3+(aq)
Cu2+(aq)
- 2. Multiple Choice
Electrons in copper(II) ions can be excited by the absorption of light with a wavelength of 600 nm.
What is the increase in energy, in J, for each electron excited?
Speed of light, c = 3.00 × 108 m s−1
Planck’s constant, h = 6.63 × 10−34J s
3.98 × 10−40
1.33 × 10−39
3.32 × 10−28
3.32 × 10−19