Chemistry Section
41. What is the name of the process where fatty foods become rancid?
a) Corrosion
b) Oxidation
c) Reduction
d) Hydrogenation
42. Which of the following gas can be used for storage of fresh sample of an oil for a long time:
i. Carbon dioxide
ii. Nitrogen
iii. Hydrogen
iv. Helium
a) i and iv
b) ii and iii
c) ii and iv
d) none of the above
43. Reema took 5ml of lead nitrate solution in a beaker and added approximately 4ml of potassium iodide solution to it, what would she observe?
a) Solution turned red
b) Yellow precipitate was formed
c) White precipitate was formed
d) Reaction mixture became hot
44. A student while burning a magnesium ribbon in air collected the product in a wet watch glass, the new product obtained was:
a) Magnesium oxide
b) Magnesium carbonate
c) Magnesium hydroxide
d) Magnesium chloride
45. The chemical formula for plaster of paris is:
a) CaSO4
b) CaSO4H2O
c) CaSO41/2 H2O
d) 2 CaSO4H2O