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The compound<unk>  has the formula<unk> .  At room temperature, it is a colorless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric humidity.<unk>  gas and hydrochloric acid are important in technology and industry. The formula<unk>  is often used to refer, somewhat misleadingly, to hydrochloric acid, an aqueous solution derived from<unk> .
Hydrogen chloride
Allyl chloride
Methyl isocyanate
Bromide
Meconic acid
Ceric ammonium nitrate
Dimethyl sulfide
Calcium oxide