Following are Sherwood number, Schmidt number, and Reynolds number definitions:

$N_{Sh}=k_c^{\text{'}}\frac{L}{D_{AB}}$;$N_{Sc}=\frac{(\frac{}{})}{D_{AB}}$;$N_{Re}=\frac{Lv}{}$

$(1)$ A high value of the Sherwood number indicates

$($a$)$ convective mass transfer is more important as compared to diffusive mass transport

$($c$)$ diffusive mass transfer is high as compared

to convective mass transport

$($b$)$ convective mass transfer is less important as compared to diffusive mass transport

$($d$)$ Nothing can be said about mass transport

$(2)$ The Schmidt number is much higher for liquids as compared to gases mainly because

$($a$)$ higher momentum diffusivity of liquids as compared to gases

$($c$)$ higher mass diffusivity of liquids as compared to gases

$($b$)$ lower momentum diffusivity of liquids as compared to gases

$($d$)$ lower mass diffusivity of liquids as compared to gases

$(3)$ For the diffusion of gases A and $B$ in a binary mixture of A and $B,$ the flux of $A$ is given by $N_A=-c{D}_{AB}\frac{d(x_A)}{dz}+\frac{c_A}{c}(N_A+N_B).$ For the diffusion of gas B through the stagnant non$-$diffusing gas $C,$ the flux of $B(N_B)$ is given by$,$

$($a$)-c{D}_{BC}\frac{d(x_B)}{dz}+\frac{c_B}{c}(N_B)$

$($b$),-c{D}_{BC}\frac{d(x_B)}{dz}+\frac{c_B}{c}(N_C)$

$($c$)-c{D}_{BC}\frac{d(x_C)}{dz}+\frac{c_B}{c}(N_C)$

$($d$)-c{D}_{BC}\frac{d(x_C)}{dz}+\frac{c_B}{c}(N_B)$

$(4)$ For the diffusion of gas $B$ through the stagnant non$-$diffusing gas $C$ a binary mixture of $B$ and $C,$ the flux of $B(N_B)$ is given by$,$

$($a$)c{D}_{BC}\frac{d(x_C)}{dz}+\frac{c_B}{c}(N_B)$

$($b$),-c{D}_{BC}\frac{d(x_B)}{dz}+\frac{c_B}{c}(N_C)$

$($c$)c{D}_{BC}\frac{d(x_B)}{dz}+\frac{c_B}{c}(N_B)$

$($d$),c{D}_{CB}\frac{d(x_B)}{dz}+\frac{c_B}{c}(N_B)$

$(5)$ The permeability of polymer A is more than ten times higher than the polymer B for the oxygen gas. For packaging a high value pharmaceutical product $($medicine$),$ it required to keep the diffusion flux of atmospheric oxygen to the medicine as low as possible to avoid its oxidation to increase the shelf life $($product expiry$).$ Based on your mass transfer knowledge, which of the following options will you choose

$($a$)0\mathrm{.}5mm$ film of polymer $A$

$($b$)0\mathrm{.}5mm$ film of polymer $B$

$($c$)($i$)0\mathrm{.}2mm$ film of polymer $A($ii$)0\mathrm{.}3mm$ film

$($d$)($i$)0\mathrm{.}3mm$ film of polymer B $($ii$)0\mathrm{.}2mm$ film of polymer B of polymer $A$

At $P=1$atm and $T=298K,$ a mixture of Hydrogen and Ammonia contains $10$mole$\%$ Hydrogen. The diffusivity of Hydrogen in this mixture is $0\mathrm{.}783{10}^{-4}\frac{m^2}{s}.$ What will be the molecular diffusivity of Hydrogen in the mixture containing $20$ mole $\%$ Hydrogen at $P=1$ atm and $T=350K.$

$($a$)$ greater than $0\mathrm{.}783{10}^{-4}\frac{m^2}{s}$

$($b$)$ equal to $0\mathrm{.}783{10}^{-4}\frac{m^2}{s}$

$($c$)$ less than $0\mathrm{.}783{10}^{-4}\frac{m^2}{s}$

$($d$)$ cannot be predicted with given information

$(1)$ Water evaporation is higher in Riyadh when compared with Jeddah at the same temperature since the humidity is lower in Riyadh. This is due to the fact that the humidity

$($a$)$ increases the diffusion coefficient of the water vapor

$($b$)$ increases the vapor pressure of the water

$($c$)$ increases driving force for the water evaporation

$($d$)$ None of these are valid reasons

$(2)$ Water evaporation is higher in Riyadh when compared with Jeddah at the same temperature since the humidity is lower in Riyadh. What do you think about the evaporation of acetone? It will be

$($a$)$ higher in Riyadh and lower in Jeddah

$($b$)$ lower in Riyadh and higher in Jeddah

$($c$)$ nothing can be said with confidence about acetone

$($d$)$ identical $($same$)$ evaporation in both cities

$(3)$ When you go to a busy gasoline station with many vehicles to fill up your car's gasoline tank. You often smell gasoline. You expect smell to be more strong

$($a$)$ in hot summer afternoon $($high temperature$)$

$($b$)$ in cold winter morning $($low temperatu