Consider three vessels containing aqueous solutions of a weak acid HA (initial concentration $C_1$, degree of dissociation $\alpha_1$ ), another weak acid HB (initial concentration $C_2$, degree of dissociation $\beta_2$ ), and their mixture (initial concentration of $\mathrm{HA}=C_1$, degree of dissociation $\alpha_3$ and initial concentration of $\mathrm{HB}=C_2$, degree of dissociation $\beta_3$ ), respectively. When $C_1$ and $C_2$ are varied, the correct plot (assuming $\alpha$ and $\beta$ to be small) is

• A

  
  
• Correct answer
  B

  
  
• C

  
  
• Correct answer
  D

  
  

Hence, the correct answer is options: 'B', 'D'.