Class X

Which non-metallic element is in liquid form ?
  1. Carbon
  2. Hydrogen
  3. Bromine
  4. Phosphorus
Which of the following non-metal is good conductor of electricity?
  1. Graphite
  2. Phosphorus
  3. Hydrogen
  4. Bromine
Food cans are coated with tin and not with zinc because
  1. zinc is costlier than tin.
  2. zinc has a higher melting point than tin.
  3. zinc is more reactive than tin
  4. ) zinc is less reactive than tin.
atom is In general the number of electrons in the outermost shell of a metal
  1. 1
  2. 1 to 3
  3. 5 to 8
  4. 8
Which of the following is not a half-metal?
  1. silicon,
  2. boron,
  3. arsenic
  4. chlorine
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