Class X

By which reaction metal is obtained from metal oxide ?
  1. Liquefaction
  2. Reduction
  3. Calcination
  4. Roasting
Which of the following non-metal is good conductor of electricity?
  1. Graphite
  2. Phosphorus
  3. Hydrogen
  4. Bromine
. Which of the is more reactive?
  1. Hg
  2. Al
  3. Ag
  4. Ca
What are the constituents of alloy solder?
  1. Copper, zinc
  2. Copper, tin
  3. Lead, Zinc
  4. Lead, tin
. Bauxite is an ore of which metal
  1. iron
  2. aluminium
  3. copper
  4. tin
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