Which of the following statements regarding copper salts is not true? — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Analyze each statement: (a) In aqueous solution, Cu+ is highly unstable and spontaneously disproportionates into Cu and Cu2+ (true). (b) Cu+ can be stabilized as insoluble coordination complexes (true). Step 2: (c) Copper(II) oxide (CuO) is a black powder, not red. Copper(I) oxide (Cu2O) is red, so statement (c) is false. (d) While CuSO4.5H2O has five water molecules in its formula, only four of them are directly coordinated as water of crystallization to the Cu2+ ion, with the fifth held by hydrogen bonds to the sulfate group. This makes statement (d) conceptually incorrect or debatable. Step 3: Therefore, statements (c) and (d) are both not true, matching the answer key (c, d).