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JEE Main levelSingle correct optionDifficulty 2 of 3pn025

Both metals in which of the following pairs become passive in cold concentrated nitric acid?

A $Zn$ and $Cu$
B $Fe$ and $Al$
C $Cu$ and $Ag$
D $Zn$ and $Sn$

Answer: B

Cold concentrated

HNO X_{3}

forms a thin, unreactive oxide film on

Fe

,

Cr

and

Al

, rendering them passive.

Zn

,

Cu

,

Ag

and

Sn

are attacked by the acid.

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