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Select the correct statement.
(A) Ostwald's method of preparation of \( \mathrm{HNO}_{3} \) is based
\( \mathrm{P} \) upon catalytic oxidation of \( \mathrm{NH}_{3} \) by atmospheric oxygen.
(B) \( \mathrm{HNO}_{2} \) can act as both oxidising and reducing agent.
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(C) \( \mathrm{NO}_{2} \) reacts with \( \mathrm{O}_{3} \) to form \( \mathrm{N}_{2} \mathrm{O}_{5} \).
(D) \( \mathrm{HNO}_{3} \) can be used both as oxidising and reducing agent.
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