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Q.

Identify the metals used in sacrificial electrode of another metals

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a

Iron

b

Silver

c

Gold

d

Mg, Zn

answer is D.

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Detailed Solution

They form a protective layer for the metal from being getting corroded 

Ex: Zn is used in galvanization, Mg, Zn is used for sacrificial electrode. 

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Identify the metals used in sacrificial electrode of another metals