Annealing of glass is done in

A. a cupel

B. a long narrow chamber

C. an open furnace

D. a closed furnace

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  1. Two or more entirely different compounds having the same molecular formula are known as
  2. The compound used in photography is
  3. The formula for cane sugar is
  4. Ozone occurs in the upper layers of air in the atmosphere because
  5. Which of the following cannot be used as fuel?
  6. Gases have
  7. The alloy which is extremely hard and resistant to acids is
  8. An acid which is used as a preservative for pickles is
  9. A metal which occurs 'free' in nature is
  10. Leakage in Liquefied Petroleum Gas (LPG) cylinders is easily detected by adding
  11. If people sleep in closed rooms where charcoal fire is burning, they die due to
  12. The metal which reacts most violently with cold water is
  13. Iron is rendered passive by
  14. Which of the following biology laboratory?
  15. The freezing point of water at 760 mm pressure is
  16. Which or the following gases is soluble in water and Is collected by the downward displacement or air?
  17. A common rodenticide is (Rat Poison)
  18. The science which deals with the chemistry of life processes is known as
  19. Which of the following is a mixture?
  20. Dry Ice is
  21. Temporary hardness is due to the presence of
  22. Metals are usually heavy. A light metal is
  23. Refined petroleum is decolourised by
  24. A metal which exhibits allotropy is
  25. Beri-beri is caused by deficiency of Vitamin
  26. Rusting of iron cannot be prevented by
  27. Which of the following is not an antibiotic?
  28. The alloy added in the preparation of steel contains
  29. Which one of the following is present in the largest amount in terms of per cent by mass in the earth's…
  30. Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures…