Question
How does nitric acid react with the following ? Give equations.
(i) Copper
(ii) Iron
(i) Copper
(ii) Iron
✓
Answer
(i) Reaction with hot and conc. $HNO _3$ :
$2 HNO _3 \xrightarrow{\Delta} 2 NO _2+ H _2 O +[ O ]$
$Cu +[ O ] \rightarrow CuO$
Reaction with Iron (Fe) :
(i) Reaction with conc. $HNO _3$ : Iron becomes passive with pure conc. $HNO _3$ i.e. it does not react. As such it becomes due to deposited layer of ferroso ferric-oxide on the surface of iron.
(ii) Reaction with conc. $HNO _3$ :
$2 HNO _3 \xrightarrow{\Delta} 2 NO _2+ H _2 O +[ O ]$
$Cu +[ O ] \rightarrow CuO$
Reaction with Iron (Fe) :
(i) Reaction with conc. $HNO _3$ : Iron becomes passive with pure conc. $HNO _3$ i.e. it does not react. As such it becomes due to deposited layer of ferroso ferric-oxide on the surface of iron.
(ii) Reaction with conc. $HNO _3$ :
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