Which of the following are used in the formation of selenium dioxide along with water and elemental selenium?

Nitric acid

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Sulfuric acid

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Sodium hydroxide

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Quick lime

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Solution

The correct option is A Nitric acid
Selenium dioxide is prepared by oxidation of selenium by burning in air and nitric acid or by reaction with hydrogen peroxide, but perhaps the most convenient preparation is by the dehydration of selenous acid.
$3 S e + 4 H N O_{3} + H_{2} O ⟶ 3 H_{2} S e O_{3} + 4 N O H_{2} S e O_{3} ⇌ S e O_{2} + H_{2} O$

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