Vulcanisation of rubber decreases its________?

Which of the following packing materials provides for maximum mass transfer?

Nusselt number/Biot number varies________?

Shape factor for a cylinder whose length equals its diameter is________?

A stable system is the one________?

Catalyst used in the ‘catalytic converter’ employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is________?