The gold numbers of four protective colloids O,P,Q and R are 0.005, 0.01, 0.1 and 0.5
Channel: Doubtnut
Date: 02/11/2021

The gold numbers of four protective colloids O,P,Q and R are 0.005, 0.01, 0.1 and 0.5 respectively. The decreasing order of their protective power is