Class IX

The most malleable metal is
  1. platinum
  2. silver
  3. iron
  4. gold
The mass of one Avogadro number of helium atom is
  1. 1.00 gram
  2. 4.00 gram
  3. 8.00 gram
  4. 4 x 6.02 x 1023 gram
The iron ore magnetite consists of
  1. Fe2O3
  2. Fe3OH4
  3. FeCO3
  4. 3Fe2O3 .. 3H2O
The mineral containing both magnesium and calcium is
  1. magnesite
  2. calcite
  3. carnallite
  4. dolomite
The gas used in the manufacture of vanaspati from vegetable oil is
  1. hydrogen
  2. oxygen
  3. nitrogen
  4. carbon dioxide
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