Steady state equimolal counter diffusion occurs in case of ________?

Stamp mills are generally used for crushing________?

In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is________?

Pick out the wrong statement?

The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vaporised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is________?

If an ideal solution is formed by mixing two pure liquids in any proportion, then the ________ of mixing is zero?