31. Which of the following processes is absent in glass manufacturing process?
32. A good quality coal should have
33. The ideal pulp for the manufacture of paper should have high __________ content.
34. __________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant.
35. Rotary kiln is not involved in the production of
36. Which is the main reducing agent during production of iron from iron ore in a blast furnace?
37. Which of the following is a constituent of vinegar?
38. The most popular and common detergent i.e., alkyl benzene sulfonate (ABS) is a/an __________ detergent.
39. __________ acid is an unsaturated fatty acid.
40. Carbon content of pitch (residue of coal tar distillation) is around __________ percent.
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