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PG TRB Chemistry Question Paper with Answers

TRB Model Questions
 
5. When silver tarnishes in air it turns black. This indicates that there is ____ in air.
 
  • A. Hydrogen sulphide
  • B. Carbon monoxide
  • C. Carbon dioxide
  • D. Helium
Answer: A.
Hydrogen sulphide
 
6. Element which is an enemy of copper is
 
  • A. Nitrogen
  • B. Chlorine
  • C. Carbon
  • D. Sulphur
Answer: D.
Sulphur
 
 
7. The pH of a neutral solution is
 
  • A. 0
  • B. 1
  • C. 7
  • D. 9
Answer: C.
7
 
8. One of the gases polluting air is
 
  • A. Nitrogen
  • B. Oxygen
  • C. Hydrogen
  • D. Sulphur dioxide
Answer: D.
Sulphur dioxide