Portland cement consists mainly of

A. CaO & SiO2

B. SiO2 & Al2O3

C. CaO & Al2O3

D. CaO & Fe2O3

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  1. Hydrogenation of oil/fat does not
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  3. Deaeration of water in its treatment is necessary, as it
  4. Baking soda is chemically represented by
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  8. Commercial production of calcium carbide requires limestone and __________ as raw materials.
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  12. Conversion of SO2 to SO3 in Monsanto 4-pass converter is about __________ percent.
  13. Analgesic drugs are
  14. Use of water having dissolved oxygen in boilers promotes
  15. Zeolite is used in the
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  17. Chrome tanning and vegetable tanning are done for
  18. Pure rectified spirit contains about __________ percent alcohol.
  19. Platinum catalyst used in the earlier days of sulphuric acid manufacture by contact process suffers…
  20. Sulphur addition in soap is done to
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  22. Fermentation of molasses to produce ethyl alcohol is done at __________ °C.
  23. The purpose of adding Na2CO3 to water of low alkalinity is to
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