PrepBharat

1. What results due to addition of surfactants?
a) Ease of diffusion
b) Interfacial mass transfer resistance
c) Ease of mass transfer
d) A cloud over the liquid interface

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2. Which of the following is true about rate of mass transfer in gas?
a) N_A = k_p(p_ab-p_ai)
b) N_A = k_p(c_ab-c_ai)
c) N_A = k_c(p_ab-p_ai)
d) N_A = k_c(c_ab-c_ai)

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3. Which of the following is true about rate of mass transfer in liquid?
a) N_A = k_p(p_ab-p_ai)
b) N_A = k_p(c_ab-c_ai)
c) N_A = k_c(p_ab-p_ai)
d) N_A = k_c(c_ab-c_ai)

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4. Which of the following is the incorrect form of Henry’s law?
a) p_A=H_Ax_A
b) p_A = c_A/H_A
c) X_a=H_Ax_A
d) Y_A = H_Ax_A

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5. Which of the following is true about overall mass transfer coefficient KL?
a) K_L =H_A/kp +1/kc
b) 1/K_L = H_A/kp +1/kc
c) K_L =1/H_A kp +1/kc
d) 1/K_L = H_A/kp +kc

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6. What is the correct expression for overall mass transfer coesfficient based on mole fraction driving forces?
a) 1/K_x = 1/K_Ak_y + 1/k_x
b) K_x = 1/K_Ak_y + 1/k_x
c) 1/K_x = K_A/k_y + 1/k_x
d) 1/K_x = 1/K_Ak_x + 1/k_y

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7. What will be the overall mass transfer coefficient when the resistance by gas phase is negligible?
a) 1/K_x = 1/K_Ak_y + 1/k_x
b) K_x = 1/K_Ak_y + 1/k_x
c) 1/K_x = K_A/k_y + 1/k_x
d) 1/K_x = 1/K_Ak_x + 1/k_y

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8. What are the correct SI units for kx, ky?
a) kmol/s-m
b) kmol/s-m₂
c) mol/s-m₂
d) kmol/s

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9. Which of the following is true for mass transfer across liquid-liquid interface?
a) 1/K_x⁽²⁾ = 1/K_Ak_x⁽¹⁾ + 1/k_y⁽²⁾
b) 1/K_x⁽²⁾ = 1/K_Ak_y⁽²⁾ + 1/k_x⁽²⁾
c) 1/K_x⁽²⁾ = 1/K_Ak_x⁽¹⁾ + 1/k_x⁽²⁾
d) 1/K_x⁽²⁾ = 1/k_y⁽¹⁾ + 1/k_x⁽²⁾

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10. What is the SI unit of kp?
a) kmol/s-m₂-pa
b) kmol/s-m-kpa
c) kmol/m₂-kpa
d) kmol/s-m₂-kpa

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