When a bottle of conc. hydrochloric acid is opened, the white fumes produced is due to the immediate reaction of gas with in the air.

C O_{2}

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water vapour

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C l_{2}

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O_{2}

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HCl

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Solution

The correct options are
B water vapour
E HCl
HCl has high affinity for water. When the stopper of a bottle is opened, HCl gas escapes and combines with moisture or water vapour present in the air. This immediately results in the formation of white fumes which are also called mist of hydrochloric acid.

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(xiv) Two colourless gases which when mixed produce a white solid.

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