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Find Out the correct pair. (a) Cu^2+ , Zn^2+

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Find Out the correct pair.

(a) Cu2+ , Zn2+

(b) CO3+ , Cr3+ 

(c) Ti3+ , V3+ 

(d) Mn3+ , Cr3+

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(c) Ti3+ , V3+ 

have negative electrode potential whereas others have different values

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