Class XI

Among the various allotropes of carbon,
  1. coke is the hardest, graphite is the softest
  2. diamond is the hardest, coke is the softest
  3. diamond is the hardest, graphite is the softest
  4. diamond is the hardest, lamp black is the softest
The most important ore of aluminium is
  1. galena
  2. calamine
  3. calcite
  4. bauxite
The gases used in different types of welding would include
  1. oxygen and hydrogen
  2. oxygen, hydrogen, acetylene and nitrogen
  3. oxygen, acetylene and argon
  4. oxygen and acetylene
The gas usually filled in the electric bulb is
  1. nitrogen
  2. hydrogen
  3. carbon dioxide
  4. oxygen
Galvanised iron sheets have a coating of
  1. lead
  2. chromium
  3. zinc
  4. tin
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