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Washing soda is

A. sodium hydroxide

B. sodium carbonate

C. sodium bicarbonate

D. potassium chloride

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  1. Glass articles are annealed so that
  2. Hard water does not lather well with soap because
  3. The most abundant constituent in air is
  4. The iron salt used in blue prints is
  5. The main constituent of gobar gas is
  6. The earliest known acid is
  7. Which of the following is a Bleaching agent?
  8. The alloy added in the preparation of steel contains
  9. Which of the following is used in fuel to propel rockets?
  10. Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures…
  11. Which of the following is used as an illuminant?
  12. Which of the following is used as a food preservative?
  13. Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
  14. Mild steel contains
  15. The oldest known organic compound is
  16. The discoverer of chloroform was
  17. Which or the following gases is soluble in water and Is collected by the downward displacement or air?
  18. Which of the following la a very good supporter of combustion?
  19. Which of the following is not an antibiotic?
  20. Which of the following is not a metal?
  21. The substance most abundantly found in sea water is
  22. In the making of jewels, gold is usually mixed with
  23. The raw materials used in the manufacture of cement are
  24. Galvanising is coating Iron with
  25. A substance used both as an explosive and as a germicide is
  26. Clark's method for removal of temporary hardness in water uses
  27. Which of the following is a halogen?
  28. Iron is coated with zinc to prevent rusting. The process is called
  29. In addition to nitric acid, another acid which may render iron passive is
  30. Which of the following statements regarding natural radioactivity is true?