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For a stoichiometric mixture of reactants, which statement best describes the changes that occur when this reaction goes to completion?
$Zn + 4 {HNO}_{3} ⟶ Zn {({NO}_{3})}_{2} + 2 {NO}_{2} + 2 H_{2} O$

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All of the zinc is oxidized and some of the nitrogen is reduced.

All of the zinc is oxidized and all of the nitrogen is reduced.

Some of the zinc is oxidized and all of the nitrogen is reduced.

Some of the zinc is oxidized and some of the nitrogen is reduced.

answer is A.

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Detailed Solution

The oxidation state of the given equation can be given as,

$\underset{0}{Zn} + \underset{+ 5}{4 {HNO}_{3}} ⟶ \underset{+ 2}{Zn} \underset{+ 5}{{({NO}_{3})}_{2}} + 2 {NO}_{2} + 2 H_{2} O$

Here, all of the zinc is oxidized and some of the nitrogen is reduced.

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