(a) Describe the action of concentrated $H N O_{3}$ on (i) P and (ii) C

(b) State whether the following statement is correct or incorrect. If incorrect, correct it.
Nitric acid is highly corrosive and non-poisonous. [3 MARKS]

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Solution

a) 2 Marks
b) 1 Mark

(a) (i) Concentrated $H N O_{3}$ oxidises phosphorus to phosphoric acid.
$P_{4} + 20 H N O_{3} (c o n c .) \to 4 H_{3} P O_{4} P h o s p h o r i c a c i d + 4 H_{2} O + 20 N O_{2}$

(ii) Concentrated $H N O_{3}$ oxidises carbon to carbon dioxide.
$C + 4 H N O_{3} (c o n c .) \to C O_{2} + 4 N O_{2} + 2 H_{2} O$

(b) The statement is correct. Nitric acid is highly corrosive and non-poisonous.

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