Class XI

 Conversion of carbonate into oxides and carbon dioxide is called as
  1. combustion
  2. Thermal decomposition
  3. Neutralization
  4. Respiration
If number of electrons in chlorine are 17, number of shells required will be
  1. 2
  2. 3
  3. 4
  4. 5
Elements and their isotopes have
  1. same number of protons
  2. same number of electrons
  3. different number of neutrons
  4. All of these
Chemical formula of Copper(I) Oxide
  1. Cu2O
  2. Cu(OH)2
  3. CuO3
  4. CuO
All are covalent compounds except
  1. NO2
  2. SO3
  3. SO2
  4. HNO3
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