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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|
|
Column I (Compound/element)
|
|
Column II (Use)
|
|
(i)
|
Lanthanoid oxide
|
(a)
|
Production of iron alloy
|
|
(ii)
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Lanthanoid
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|
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Magnesium based alloy is constituent of
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(d)
|
Lanthanoid metal + iron
|
|
(v)
|
Mixed oxides of lanthanoids are employed
|
(e)
|
Bullets
|
|
|
|
(f)
|
In X-ray screen
|
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Code:
→|
|
Column $I ($Complex ion$)$
|
|
Column $II ($Colour$)$
|
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|
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|
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|
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|
|
|
|
$5.$ |
Blue
|
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