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

Question

Based on the following observations for 3 unidentified metals (Z, X and D) and solutions of their metal cations (Z^n+ and E^n+), rank the metals in terms of reducing agent strength, from lowest to highest. When metal X is placed in an aqueous solution of E^n+, a dark residue forms on the metal. When metal Z is placed in an aqueous solution of E^n+, the metal's appearance does not change. When metal D is placed in an aqueous solution of Z^n+, the metals appearance does not change. When metal X is placed in an aqueous solution of Z^n+, a dark residue forms on the metal. Weakest RA Strongest RA

Explanation / Answer

When X is palced in an aqueous solution of E^n+ then a dark residue forms on the metal. This indicates X reduces E^n+ to E. So X is strong reducing agent than E.

When Z is palced in an aqueous solution of E^n+ then no change is observed. This indicates Z can't reduce the ion E^n+ to E. So E is strong reducing agent than Z.

When D is palced in an aqueous solution of Z^n+ then no change is observed. This indicates D can't reduce the ion Z^n+ to Z. So Z is strong reducing agent than D.

When X is palced in an aqueous solution of Z^n+ then no change is observed. This indicates X reduces the ion Z^n+ to Z. So X is strong reducing agent than Z.

Hence the order of metals from strongest reducing nature to weakest reduction nature.

D < Z < E < X

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