Based on the following observations for 3 unidentified metals (Z, X, and D) and

Question

Based on the following observations for 3 unidentified metals (Z, X, and D) and solutions of their metal cations (Zn+ and En+), rank the metals in terms of reducing agent strength, from lowest to highest.

-When metal X is placed in an aqueous solution of En+, a dark residue forms on the metal.

-When metal Z is placed in an aqueous solution of En+, the metals appearance does not change.

-When metal D is placed in an aqueous soltuion of Zn+, the metal appearance does not change.

-When metal X is placed in an aqueous solution of Zn+, a dark residue forms on the metal.

Weakest RA________,______,________,______Strongest RA

Explanation / Answer

Among the two metals Z, X and D in forms Zn+ and En+, the one which would be able to displace the other metal from solution and forms solid metal on top of the other, will be a better oxidizing agent.

So when X is placed in En+, dark residue forms which shows, the metal is getting reduced. So X is a better reducing agent and reduces En+ to En.

Z does not reduce En+. X is stronger reducing agent than Z.

D does not reduce Zn+

metal X reduces Zn+ to Zn. So it is a reducing agent stronger than D. X is also the strongest reducing agent of all.

Weakest RA : Z ; D ; X : Strongest RA

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