Which one of the following is used in the preparation of cellulose nitrate?

K N O_{3}

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H N O_{3}

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K N O_{2}

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H N O_{2}

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Solution

The correct option is B $H N O_{3}$
The process uses nitric acid to convert cellulose into cellulose nitrate and water:
$3 H N O_{3} + C_{6} H_{10} O_{5} \to C_{6} H_{7} (N O_{2})_{3} O_{5} + 3 H_{2} O$
The sulfuric acid is present as a catalyst to produce the nitronium ion, $N O_{2}^{+}$ . The reaction is first order and proceeds by electrophilic substitution at the $C - O H$ centres of the cellulose

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