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The luster of a metal is due to :

  • high polishing
  • high density
  • chemical inertness
  • presence of free electrons
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1. The substance that contains the maximum amount of nitrogen is ?

  • Ammonium Sulphate
  • Urea
  • Ammonium Nitrate
  • Ammonium Chloride

2. Which acid is present in lemon ?

  • marlic acid
  • citric acid
  • lactic acid
  • tartaric acid

3. What is metallurgy ?

  • process of extracting metal in pure form from its ore.
  • process of creating alloys of metals.
  • process of making metals live long.
  • None of above.

4. The Chemical Symbol of Sodium is

  • So
  • Sd
  • Na
  • Nu

5. Why is phosphorus kept under water ?

  • to make it wet
  • to make it durable
  • water forms a protective coating on it
  • to save it from catching fire when exposed to dry air
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