NTPC CBT-2 Chemistry Quiz - 52

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Question 1:

Which of the following is elements present in ruby ?

Question 2:

Silver articles become black after some time when exposed to air because- ?

Question 3:

Which of the following is not the surface phenomenon ?

Question 4:

The fiber that burns readily with the smell of burning paper is:

Question 5:

Which one of the following is gaseous air pollutants ?

  1. Nitrogen and carbon
  2. Smoke
  3. Smog
  4. Hydrocarbons