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Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous glass called

A. Carbon Monoxide

B. Phosgene

C. Phosphine

D. None of these

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  1. Apparatus invented by Archimedes is :
  2. The metal that is present in Photo Films is
  3. Brass gets discoloured in air due to the presence of which gas in air
  4. Water has maximum density at
  5. The solar eclipse occurs when
  6. When a gas is turned into a liquid, the process is called
  7. Which of the following is the lightest metal ?
  8. Liquefied Petroleum gas (LPG) consists of mainly
  9. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  10. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  11. What is the unit for measuring the pitch or frequency of sound ?
  12. The speed of light with the rise in the temperature of the medium
  13. Which of the following is commonly called a polyamide ?
  14. The removal of top soil by water or wind is called
  15. The fastest acting enzyme in the biological kingdom is
  16. Which of the following characters is not shown by hydrogen
  17. The formula of Plaster of Paris is
  18. One fathom is equal to
  19. Which of the following elements is obtained from sea weeds ?
  20. Pollination by birds is called
  21. The hardest substance available on earth is
  22. The element present in the largest amount in rocks and minerals is
  23. Earth's seasons are caused by which of the following?
  24. The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
  25. Glass is made from the mixture of
  26. In an atomic nucleus, neutrons and protons are held together by
  27. The property of a substance to absorb moisture from the air on exposure is called
  28. The most important ore of Aluminium is
  29. The metal used in storage batteries
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