82.
Hypo (sodium thiosulphate) because of its complex forming behaviour is used in photography to remove undecomposed silver bromide as a soluble complex for __________ of the picture.

86.
Which of the following is the most suitable for removing fine particles (< 1 micron diameter) from air below its dew point?

87.
Volute casing of a centrifugal pump does not facilitate

89.
Function of fusible plug in a boiler is to