Class XI

 −78 °C is the
  1. Melting point of carbon dioxide
  2. Boiling point of carbon dioxide
  3. Melting point of oxygen gas
  4. Both A and B
When Carbon ions (C±4) react with Carbon Dioxide gas (CO2), product will be
  1. Methane
  2. Propane
  3. Ethane
  4. Carbon monoxide
Endothermic reactions include
  1. Conversion of sodium nitrate crystal to sodium nitrate solution
  2. Upon heating, hydrogen results in water
  3. Neutralization of acids and alkalis
  4. Respiration
Impurities like silver and gold are found in anode of
  1. Magnesium
  2. Copper
  3. Graphite
  4. Carbon
 PH is an abbreviation of
  1. Philosophy of humans
  2. Power of humans
  3. Power of hydrogen
  4. Power of hydroxonium ion
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