11. Phthalic anhydride is used
12. Pick out the wrong statement.
13. Plaster of Paris is4
14. Cement setting under water employs a/an __________ process.
15. Extraction of __________ employs an electrolytic process.
16. Polyvinyl chloride (PVC) is
17. 'Synthesis gas' meant for the synthesis of organic compound is a variable mixture of
18. Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of
19. Le-Blanc process is a primitive process for the manufacture of
20. A 'unit process' is exemplified by the
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