Correct answer
D. All A., B. and C.
Explanation
The correct answer is All A., B. and C..
With decrease in porosity, the ________ of the refractories decreases?
Argon is the third largest constituent of air (followed by N2 & O2). Its percentage by volume in air is________?
A reaction which is catalysed by a base is catalysed by all substances which have a tendency to________?
The solvent used in Barisol dewaxing process is________?
The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are________?
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ ________ percent?