Class XI

Soluble salt is
  1. Silver chloride AgCl
  2. Lead Chloride PbCl2
  3. Sodium chloride NaCl
  4. Mercury chloride HgCl2
While Potassium Iodide (KI) is a powerful reducing agent,
  1. Iodide ion is oxidized to iodine
  2. Iodide ion is reduced to iodine
  3. Iodine is reduced to iodide ion
  4. Iodine is oxidized to iodide ion
Hydrogen (H2) is not
  1. Heavier than carbon dioxide
  2. Lighter than air
  3. Colored
  4. Insoluble
In Sulfuric Acid (H2SO4), chemical composition of sulfur is
  1. 0.0204
  2. 0.3265
  3. 0.6531
  4. 0.9821
Exothermic reactions take place when
  1. Energy given out in making bonds is less than energy taken in for breaking bonds
  2. Energy given out in making bonds is more than energy taken in for breaking bonds
  3. Energy given out in making bonds is equal to energy taken in for breaking bonds
  4. Final energy content of products is lower
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