Nitric acid is manufactured by the Ostwald process in which nitrogen dioxide reacts with water. The reaction is as follows:

$p N O_{2} (g) + H_{2} O (l) \to q H N O_{3} (a q) + N O$

Find the value of $p + q$ .

8

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Solution

The correct option is C $5$
Balancing by trial and error method:

$3 N O_{2} (g) + H_{2} O (l) \to 2 H N O_{3} (a q) + N O$

From the balanced reaction we get,
$p = 3; q = 2$

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