Which of the following statements regarding copper salts is not tru...

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Which of the following statements regarding copper salts is not true?
(a) Copper (I) disproportionates to copper and copper (II) ion in aqueous solution
\( \mathrm{P} \)
(b) Copper (I) can be stablised by the formation of insoluble complex compounds such as \( \mathrm{CuCl}_{5}^{-} \)and \( \mathrm{Cu}(\mathrm{CN})_{\text {万 }}^{-} \)
W.
(c) Copper (II) oxide is red powder
(d) The water of crystallization of copper sulphate is five
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