Ncert Exercises & Solutions

Which of the following statements is not correct?

1.	Copper liberates hydrogen from acids
2.	In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine
3.	$M n^{3 +} a n d C o^{3 +}$ are oxidising agents in an aqueous solution
4.	$T i^{2 +} a n d C r^{2 +}$ are reducing agents in an aqueous solution