Class IX

The molecules of which gas have highest speed?
  1. H2 at -73oC
  2. CH4 at 300 K
  3. N2 at 1,027oC
  4. O2 at 0oC
The luster of a metal is due to
  1. its high density
  2. its high polishing
  3. its chemical inertness
  4. presence of free electrons
The octane number of zero is assigned to
  1. 2-methyl octane
  2. n-heptane
  3. iso-octane
  4. 3-methyl octane
The ore which is found in abundance in India is
  1. monazite
  2. fluorspar
  3. bauxite
  4. magnetite
The mineral containing both magnesium and calcium is
  1. magnesite
  2. calcite
  3. carnallite
  4. dolomite
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