Which of the following is an acidic gas which gives dense white fumes when the glass rod is dipped in ammonia solution and brought near it?

H C l

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H_{2} O

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N H_{3}

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C l_{2}

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Solution

The correct option is A $H C l$
The compound hydrogen chloride has the chemical formula $H C l$ . At room temperature, it is a colorless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric humidity. Dense white fumes are formed around the glass rod when dipped in ammonia solution. This is because the ammonia vapors on coming in contact with $H C l$ gas forms solid ammonium chloride particles, which get suspended in gas and appear like dense white fumes.
$N H_{3} + H C l \to N H_{4} C l$

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