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  4. A colourless gas with the smell of rotten fish is :

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Q. A colourless gas with the smell of rotten fish is :

AFMCAFMC 2005

Solution:

$H _{2} S$ has smell of rotten eggs and is produced during decay of organic matter. $SO _{2}$ has pungent odour of burning sulphur while phosphene $\left( PH _{3}\right)$ has an odour of rotten fish.