The rate constant of a chemical reaction decreases by decreasing the________?

Sillimanite is a ________ refractory?

Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

Hydrogen differs from deuterium in ________ properties?

Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a ________ operation?

What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively?