Which of the following represents a physical change?

A. sublimation

B. oxidation

C. reduction

D. decomposition

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  1. A mixture of ethyl alcohol and water can be separated by
  2. Annealing of glass is carried out by
  3. Which one of the following is used for dry cleaning?
  4. One of the ingredients of the paste on the side of a match box is
  5. Carbogen is used in
  6. The foul odour of gasoline is due to
  7. Which or the following gases is soluble in water and Is collected by the downward displacement or air?
  8. The process of heating steel to bright red heat and cooling suddenly by plunging it into water is known…
  9. Which one of the following is present in the largest amount in terms of per cent by mass in the earth's…
  10. The Combined Gas Law equation is
  11. Vinegar is an aqueous solution of
  12. Two or more entirely different compounds having the same molecular formula are known as
  13. The principle involved in dialysis, a treatment administered to patients with affected kidneys is
  14. The pure at form of iron is
  15. Mortar contains cement and sand in the ratio of
  16. Marsh gas is
  17. The value of Avogadro Number is
  18. Copper is purified by
  19. The soaps used in shaving cream are
  20. The alloy which is extremely hard and resistant to acids is
  21. The oldest known organic compound is
  22. The most abundant noble gas present in air is
  23. The commonest ore of aluminium is
  24. Invar, used for making pendulums is an alloy of steel with
  25. Marble is
  26. The fertilizer which has the largest percentage of nitrogen is
  27. Which of the following elements is not required for the healthy growth of plants?
  28. An example of thermo setting plastics is
  29. The sugar which is used in silvering mirrors is
  30. Which of the following is a mixture?