By the action of conc. $H N O_{3}$ , phosphorus changes to :

phosphorus acid

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orthophosphoric acid

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metaphosphoric acid

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pyrophosphoric acid

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Solution

The correct option is B orthophosphoric acid
Phosphorus is oxidised to orthophosphoric acid.
$2 P + 10 H N O_{3} conc. and hot - ------- \to 2 H_{3} P O_{4} + 10 N O_{2} + 2 H_{2} O$

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c o n c . H N O_{3}

Conc. sulphuric acid oxidises phosphorus to

Calculate the molar mass of the following substances:

(a) Ethyne, C₂H₂

(b) Sulphur molecule, S₈

(d) Hydrochloric acid, HCl

(e) Nitric acid, HNO₃

Which of the following gas is formed when phosphorus reacts with conc. nitric acid?

P + 5 H N O_{3} (c o n c .) \to H_{3} P O_{4} + H_{2} O + 5 N O_{2}

9.3 g

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