$($i$)$ Attempt all questions

$($ii$)$ Assume missing data suitably if any.

Section$-$A

Attempt all questions. All part carries equal marks.

$)=(20$

a$)$ Plot the four conditions of rate equation for mass transfer and reaction describing instantancous and fast reaction with high and low $C_B.$

b$)$ Define enhancement factor $E.$

c$)$ Describe the SCM model for spherical particle

$($d$)$ Define fluidized bed reactor with its mechanism.