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Setting of cement is due to

A. hydration

B. dehydration

C. dialysis

D. osmosis

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  1. Physico-chemical characteristics of water in water sources undergo changes due to
  2. Solder is an alloy of
  3. The compound used in photography is
  4. Two or more entirely different compounds having the same molecular formula are known as
  5. Invar, used for making pendulums is an alloy of steel with
  6. Which of the following represents a physical change?
  7. Quick lime has the formula
  8. During fermentation, the by-product is
  9. Which of the following elements is not required for the healthy growth of plants?
  10. The number of neutrons in the nucleus of an atom of mass A and atomic number Z is given by
  11. Riboflavin deficiency causes
  12. The function of nitrogen in air is
  13. The iron salt used in blue prints is
  14. The substance most abundantly found in sea water is
  15. The freezing point of water at 760 mm pressure is
  16. In the making of jewels, gold is usually mixed with
  17. A substance used as a fire-extinguisher under the trade name of Pyrene is
  18. Which of the following is not an antibiotic?
  19. The rate of setting of cement is slowed down by the addition of
  20. Which or the following is not a constituent or gun powder?
  21. The Long Form of the Periodic Table is based on
  22. Vulcanisation was discovered by
  23. The noble gas which is present in microscopic quantities in air is
  24. Which of the following is called 'the King of Chemicals?
  25. The human body contains about
  26. Which of the following types of water gives lather easily with soap?
  27. The flux added in the blast furnace is
  28. Mortar contains cement and sand in the ratio of
  29. An example of stimulant fertilizer is
  30. LSD is