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Which of the following statements regarding copper salts is not true?

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Copper(!) disproportionates to Cu and Cu(II) is aqueous solution

Copper(!) can be stabilized by the formation of insoluble complex compounds such as ${CuCl}_{2}^{-}$ and $Cu (CN)_{2}^{-}$ .

Copper(II) oxide is red powder

Copper sulphate molecule is associated with five molecules of water

answer is C.

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Detailed Solution

Copper(II) oxide is black powder.

(A)Copper (I) dispropotionates to copper and copper (II) ion in aqueous solution. Cu2O+H2SO4→CuSO4+H2O+Cu. Hence, the statement A is true.
(B)Copper (I) can be stabilized by the formation of insoluble complex compounds such as CuCl2−andCu(CN)2−
CuCl+Cl−→CuCl2−
2Cu+2H++4CN−→2Cu(CN)2−+H2. Hence, statement B is true
Hence, the statement B is true.
(C) Copper (I) oxide is red power whereas Copper (II) oxide is black solid. Hence, the statement C is not true.
(D) The water of crystallization of copper sulphate is five (CuSO4.5H2O). Hence, the statement D is true.

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