Which of the following statements is not correct?

Question:

Which of the following statements is not correct?

(i) Copper liberates hydrogen from acids.

(ii) In its higher oxidation states, manganese forms stable compounds with

oxygen and fluorine.

(iii) Mn3+ and Co3+ are oxidising agents in aqueous solution.

(iv) Ti2+ and Cr2+ are reducing agents in aqueous solution.

Solution:

Option (i) Copper liberates hydrogen from acids is the answer.

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