<prompt> Formaldehyde gas sterilization is employed for?Sterilizing hea lung machinesGlass materialsPaper and clothFumigation of operation theater  <response>: Formaldehyde gas is used for sterilising instruments and heat sensitive catheters and for fumigating wards and sick rooms and laboratories REF:Ananthanarayan and Panickers Textbook ofMicrobiology 8thEdition pg no:36 