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Transition Chemistry: Colours

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Total cards: 22•Content version: v3•Public deck•Updated: 8/1/2026

Card preview (22)

#1
Front (Question)

What is the colour of Cr3+ metal-aqua ions?

Back (Answer)

Violet

#2
Front (Question)

What is the colour of Fe2+ metal-aqua ions?

Back (Answer)

Green

#3
Front (Question)

What is the colour of Fe3+ metal-aqua ions?

Back (Answer)

Yellow

#4
Front (Question)

What is the colour of Mn2+ metal-aqua ions?

Back (Answer)

Pale pink

#5
Front (Question)

What is the colour of Cu2+ metal-aqua ions?

Back (Answer)

Blue

#6
Front (Question)

What is the colour of the precipitate formed when Cr2+ ions react with OH- or NH3?

Back (Answer)

Green

#7
Front (Question)

What is the colour of the precipitate formed when Fe2+ ions react with OH- or NH3?

Back (Answer)

Green

#8
Front (Question)

What is the colour of the precipitate formed when Fe3+ ions react with OH- or NH3?

Back (Answer)

Brown

#9
Front (Question)

What is the colour of the precipitate formed when Mn2+ ions react with OH- or NH3?

Back (Answer)

Pale brown

#10
Front (Question)

What is the colour of the precipitate formed when Cu2+ ions react with OH- or NH3?

Back (Answer)

Blue

#11
Front (Question)

Which transition metal ion reacts with excess NaOH?

Back (Answer)

Cr3+ - it is able to re-dissolve in excess NaOH

#12
Front (Question)

What colour is the solution formed when Cr3+ reacts with excess OH-?

Back (Answer)

Green

#13
Front (Question)

Which transition metal ions react with excess NH3?

Back (Answer)

Cr3+ and Cu2+ - these are soluble excess ammonia

#14
Front (Question)

What colour is the solution formed when Cr3+ reacts with excess NH3?

Back (Answer)

Purple

#15
Front (Question)

What colour is the solution formed when Cu2+ reacts with excess NH3?

Back (Answer)

Dark blue

#16
Front (Question)

What is the colour of the [CuCl4]2- complex?

Back (Answer)

Yellow

#17
Front (Question)

What are the colours of the solution and ppt formed when Cu2+ is reduced by I-?

Back (Answer)

White Cu+ precipitate in a brown I2 solution

#18
Front (Question)

What is the colour of the solution and ppt formed during the disproportionation of Cu+?

Back (Answer)

Blue CuSO4 solution and a brown Cu solid.

#19
Front (Question)

What is the colour of the [CoCl4]2- complex?

Back (Answer)

Dark blue solution

#20
Front (Question)

What is the colour of Cr2O7 2-?

Back (Answer)

Orange solution

#21
Front (Question)

What is the colour of CrO4 2-?

Back (Answer)

Yellow

#22
Front (Question)

What colour change is observed during the redox reaction between I- and Fe3+?

Back (Answer)

Orange-brown Fe3+ to brown I2 solution