31. Sulphur addition in soap is done to
32. Bromides contained in hot mother liquor is treated with __________ during manufacture of bromine from sea water.
33. Roasting of metallurgical ores is done mainly to
34. Lurgi coal gasifier is a pressurised __________ bed reactor.
35. Manufacture of phthalic anhydride uses __________ as a catalyst.
36. Pure rectified spirit contains about __________ percent alcohol.
37. Vanillin is a type of
38. Varnish does not contain
39. Varnish does not contain
40. In the production of soda ash by Solvay process, the by-product is
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