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Consider a batch distillation process for an equimolar mixture of benzene and toluene at atmospheric pressure. The mole fraction of benzene in the distillate collected after $10$ minutes is $0.6$. The process is further continued for additional $10$ minutes. The mole fraction of benzene in the total distillate collected after $20$ minutes of operation is

- less than $0.6$
- exactly equal to $0.6$
- exactly equal to $0.7$
- greater than $0.7$