colours of transition metals - ions & compounds Watch

medhelp
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are the colours for transition metals ions the same colour as their compounds?

like you have hydrated cuso4 is dissolved in water, it forms a blue hexa aqua cu 2+ ions and that is what's responsible for the blue colour of the overall solution the sulphate doesn't affect anything.

but chromium cr 3+ is green when produced in reaction, but as hexa aqua cr3+ it produced violet solution - why?

and how am i supposed to remember of all the compounds if theyre not the same? is there at least a rule or something
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