Discussion
Assertion (A): A CSTR can have three steady states, of which the middle one is unstable.
Reason (R): At the middle intersection a small rise in temperature increases generation faster than removal.
Answer: D
Both are true and the reason gives the instability criterion: the system runs away to the upper state or falls back to the lower one, and only feedback control can hold it between. The outer two states are both stable.
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