Permanent hardness of water is due to the presence of calcium & magnesium

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1. Which of the following fuel gases contains maximum amount of carbon monoxide?
2. A unit operation is exemplified by the process of
3. Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
4. Concentration of NaOH solution produced by diaphragm electrolytic cell is about __________ percent.
5. Carbon tetrachloride (CCl4) is the starting raw material for the manufacture of
6. Magnesium and calcium __________ cause temporary hardness of water.
7. __________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.
8. Pick out the wrong statement.
9. Consider the production of ammonia from methene and air as raw materials. The catalysts used are:(i)…
10. __________ is used as a flux in the extraction of iron from iron ore (haematite) in blast furnace.
11. The difference between saponification value and acid value is
12. A good quality coal should have
13. High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to
14. CaSO4 . ½H2O is known as
15. Hydrazine is used in water treatment for the removal of
16. Fish contains about __________ percent oil.
17. Highly porous refractory bricks are
18. Unsaturated oils compared to saturated oils have
19. Glycerine is not used in the
20. Roasting of metallurgical ores is done mainly to
21. Which of the following is used as a binding material in soap to improve soap texture?
22. Litharge is
23. Which of the following contains least amount of N2?
24. __________ is an ore of lead.
25. RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically
26. Pick out the wrong statement.
27. Most widely and commonly used coagulant for the removal of suspended impurities in water is
28. Dehydrogenation of ethyl benzene produces
29. Which of the following is not an abrasive material?
30. Vegetable oils and fats basically differ in their

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