$($IV$)$ Which of the following is considered important in heterogeneous catalysis?

$($i$)$ Physical adsorption

$($ii$)$ Chemisorption

$($iii$)$ Both $($i$)$ and $($ii$)$

$($iv$)$ None of the above

$($V$)$ The optimum temperature progression for exothermic reversible reaction is

$($i$)$ The locus of maximum rates

$($ii$)$ Highest allowable temperature

$($iii$)$ The isothermal path

$($iv$)$ Lowest allowable temperature

$($VI$)$ Which of the following reactors is used for large $\frac{C_P}{-H_4}?$

$($i$)$ CSTR

$($ii$)$ PFR

$($iii$)$ Recycle reactor

$($iv$)$ None of the above

$($VII$)$ If the exit age distribution is given as $(t-4),$ then ${\displaystyle \underset{0}{\overset{a}{}}}{t}^{2}E(t)dt$ is

$($i$)4$

$($ii$)8$

$($iii$)16$

$($iv$)12$

$($VIII$)$The point of intersection of energy balance and material balance curves for an exothermic irreversible reaction, wherein instability is witnessed is stated as

$($i$)$ Pour point

$($ii$)$ Boiling point

$($iii$)$ Flash point

$($iv$)$ Ignition point