Class XI

When Carbon ions (C±4) react with Carbon Dioxide gas (CO2), product will be
  1. Methane
  2. Propane
  3. Ethane
  4. Carbon monoxide
Examples of refractory materials include
  1. Al2O3
  2. LiCl
  3. KF
  4. CaCl2
Butane (C4H10) molecular weight is
  1. 58.122g/mol
  2. 63.71g/mol
  3. 55.12g/mol
  4. 51.19g/mol
Energy levels of electrons are also called as
  1. Shells
  2. Orbits
  3. Both A and B
  4. Photons
Impurities like silver and gold are found in anode of
  1. Magnesium
  2. Copper
  3. Graphite
  4. Carbon
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