58. The most extensive, commercially useful source of thorium as monazite sand occurs in India at A.Orissa coast B.Travancore coast C.West Bengal coast D.Gujarat coast
Answer: Option C Solution: In this question gram molecules simply means number of moles of O2 molecules. So we have 6.02*10^24 atoms of Oxygen means 3.01*10^24 molecules of O2. 3.01*10^24 molecules of O2 are equal to 5 moles.
