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Q.

Which of the following statements is not correct?

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a

Copper liberates hydrogen from acids

b

In its higher oxidation states, mangnanese forms stable compounds with oxygen and fluorine.

c

Mn3+ and Co3+ are oxidising agents in aqueous solution

d

Ti2+ and Cr2+ are reducing agents in aqueous solution.

answer is A.

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Detailed Solution

Copper placed below hydrogen in the electrochemical series. It is not in a position to release electrons to `H^(+)` ions of the acid. Therefore, hydrogen gas is not evolved.

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