Class VI

Because hydrogen forms only one bond, valency of hydrogen is
  1. 1
  2. -1
  3. 7
  4. 2
Electrons revolve around nucleus as fast as
  1. sound in air
  2. sound in liquid
  3. sound in solid
  4. light
Idea of atom was first put forward by a Greek philosopher named
  1. Williams
  2. Democritus
  3. Isaac Newton
  4. Galileo
Isotope of Uranium i.e. Uranium-238 contains
  1. 141 neutrons
  2. 142 neutrons
  3. 146 neutrons
  4. 149 neutrons
As neutrons have on electrical charge, they do not affect
  1. bonding properties
  2. physical properties
  3. chemical properties
  4. thermal properties
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