An alkaline gas A gives dense white fumes with hydrogen chloride. What is A?

NH₃

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Cl₂

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SO₂

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H₂S

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Solution

The correct option is A
NH₃

Ammonia has a sharp characteristic odour. It turns moist red litmus blue,moist turmeric paper brown and phenolphthalein solution pink.

It gives dense white fumes of ammonium chloride, with conc. hydrochloric acid.

$N H_{3} + H C l \to N H_{4} C l$

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Identify an alkaline gas A which gives dense white fumes with hydrogen chloride.

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