2) shows that Mn
3+ and Co
3+ ions are the strongest oxidising agents
in aqueous solutions The ions Ti
2+, V
2+ and Cr
2+ are strong reducing
agents and will liberate hydrogen from a dilute acid, e g ,
2 Cr
2+(aq) + 2 H
+(aq) ® 2 Cr
3+(aq) + H2(g)
4