The lubricating action of an oil is more if it possesses:

Which of the following is not a surface phenomenon?

Setting of cement is an

Which of the following are not completely surface phenomena?

Which of the following statements is/are not correct?
$(A)$ Adsorption is accompanied by decrease in enthalpy as well as decrease in entropy of the system.
$(B)$ Gases,which can react strongly with adsorbent show chemisorption.
$(C)$ When the value of the slope of the Freundlich isotherm is non-zero,adsorption is independent of pressure.
$(D)$ Gold number of potato starch is $0.15$.

Sodium thiosulphate is used in photography to :-