Class IX

Mass number of an atom is
  1. no. of protons
  2. no. of neutrons
  3. A and B both
  4. no. of electrons
Compounds have atoms of
  1. same sizes
  2. different sizes
  3. same electrons
  4. different electrons
Mass of 1 mole of sucrose is
  1. 320g
  2. 342g
  3. 341g
  4. 340g
Ca on loosing 2 electrons becomes
  1. Ca-2
  2. Ca-1
  3. Ca+2
  4. Ca-2
. Number of atoms of hydrogen in 2 moles of NH3
  1. 5 * 1023
  2. 3.01 * 1023
  3. 3.61 * 1024
  4. 4 * 1023
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