Chemical Engineering Mcqs

Smog is ______________________?
  • (A)  Nothing but black smoke
  • (B)  A combination of smoke and fog
  • (C)  A liquid particle resulting from vapor condensation
  • (D)  A solid particle
  • (E)  g. fly-ash
Pick out the wrong statement ?
  • (A)  Addition of methane to the furnace atmosphere reduces decarburising by hydrogen
  • (B)  Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures
  • (C)  Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness
  • (D)  None of these