GATE 2025 Chemical Engineering, Q11 · Chemical Technology
The correct answer is A, (i) wood, (ii) cellulose fibers, (iii) lignin.
Question
To manufacture paper from (i) ___, the (ii) ___ must be freed from the binding matrix of (iii) ___ in the pulping step. Which one of the following is the CORRECT option to fill in the gaps (i), (ii) and (iii)?
Official answer: (i) wood, (ii) cellulose fibers, (iii) lignin
Why
GATE 2025 official key: (A). Paper is made from wood; pulping frees the cellulose fibers from the lignin that binds them together.
Explanation cross-checked for consistency. Final answer matches the official IIT answer key.