What is the action of conc. nitric acid on,
a) Zinc metal
b) P4 - molecule
c) S8 - molecule?

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Solution

Aluminum and zinc do not react with concentrated nitric acid since a thick, hard to dissolve oxidation layer builds (passive oxidation) that protects the metal against further assaults. Zinc, however, reacts with diluted nitric acid.
The reaction is, $P_{4} + 20 H N O_{3} (c o n c .) \to 4 H_{3} P O_{4} + 20 N O_{2} + 4 H_{2} O$
The reaction is, $S_{8} + 48 H N O_{3} (c o n c .) \to 8 H_{2} S O_{4} + 48 N O_{2} + 16 H_{2} O$

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Q. What do you observe when
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What is the action of conc. nitric acid on, a) Zinc metal b) P4 - molecule c) S8 - molecule?

What is the action of conc. nitric acid on,
a) Zinc metal
b) P4 - molecule
c) S8 - molecule?