The Ostwald process is used in the preparation of:

Nitric acid

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Nitrous acid

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Sulfuric acid

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Oleum

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Solution

The correct option is A Nitric acid
Ostwald process: Ammonia is converted to nitric acid in presence of a Catalyst such as platinum with 10% rhodium.
$4 N H_{3} (g) + 5 O_{2} (g) P t - --- \to 10 % R h 4 N O (g) + 6 H_{2} O (g)$
$2 N O + O_{2} \to 2 N O_{2}$
$3 N O_{2} + H_{2} O \to 2 H N O_{3} + N O$

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