__________ is a special constituent of chlorophyll without which photosynthesis is not possible.

Question: Black liquor generated during paper manufacture is concentrated in a
[A].

single effect evaporator.

[B].

single effect evaporator followed by a crystalliser.

[C].

multiple effect evaporator.

[D].

multiple effect evaporators followed by a crystalliser.

Answer: Option C

Explanation:

No answer description available for this question.