The standard electrode potential ( E ⁻ ) values of ( Al ³⁺ / Al , Ag ⁺ / Ag , K ⁺ / K . and Cr ³⁺ / Cr are -1.66 ~V , 0.80 ~V , 2.93 ~V and -0.74 ~V , respectively. The correct decreasing order of reducing power of the metal is

Step-by-step solution

More negative the value of standard reduction potential, higher is the reduction power. i.e. Reducing power 1 standard reduction potential Thus, the correct decreasing order of reducing power of the metal is aligned & array llll K & > & Al & > array & ( E _ K ⁺ / K ^0=-2.93 ~V ) ( E _ Al ³⁺ / Al ^0=-1.66 ~V ) & Cr > Ag & ( E _ Cr ³⁺ / Cr ^0=-0.74 ~V ) ( E _ Ag ⁺ ^0 / Ag =0.80 ~V ) & aligned