Pressure drop in a packed bed reactor can be optimized by:

a$.$ Increasing the reactant initial partial pressure

b$.$ Increasing the particle size

c$.$ increasing the length of each tube

d$.$ All of the above

In a highly exothermic reaction, the hotspot temperature inside the reactor can be reduced b

a$.$ Increasing the inert composition in the feed

b$.$ Increasing the recycle ratio

$($C$)$ Using a semi$-$batch reactor

d$.$ All of the above