Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture.

A. CaO

B. MnO2

C. ZnO

D. FeS

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  1. In the production of soda ash by Solvay process, the by-product is
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  3. Plaster of Paris is
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  14. Dehydrogenation of Isopropanol produces
  15. __________ paper is used in the manufacture of newsprint paper.
  16. Widely used method for the conditioning of boiler feed water is the
  17. Cement setting under water employs a/an __________ process.
  18. Cumene is the starting material for the production of
  19. Separation of fresh water from sea water can be done by the __________ operation.
  20. Frasch process is for
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  24. Parathion and Malathion are
  25. Which of the following is an yellow pigment?
  26. Fourdrinier machine is used in the manufacture of
  27. Which of the following is a detergent?
  28. White phosphorous is stored under water, because
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