Environmental Chemistry · JEE Main previous year questions

2012 2 questions

1. Q852012 · 12 May 2012 · Shift 1

   Water sample is reported to be highly polluted if BOD (Biological Oxygen Demand) value of sample becomes

   1. A.more than $17\mathrm{ppm}$
   2. B.equal to $10\mathrm{ppm}$
   3. C.equal to $5\mathrm{ppm}$
   4. D.less than $5\mathrm{ppm}$
   Show answer

   Answer: A

2. Q852012 · 7 May 2012 · Shift 1

   Green house gases can be arranged in 'Global Warming Potential' sequence as

   1. A.${\mathrm{N}}_2\mathrm{O}>\mathrm{CFC}>\mathrm{C}{\mathrm{H}}_4>\mathrm{C}{\mathrm{O}}_2$
   2. B.$\mathrm{CFC}>{\mathrm{N}}_2\mathrm{O}>\mathrm{C}{\mathrm{H}}_4>\mathrm{C}{\mathrm{O}}_2$
   3. C.$\mathrm{CFC}>\mathrm{C}{\mathrm{O}}_2>{\mathrm{N}}_2\mathrm{O}>\mathrm{C}{\mathrm{H}}_4$
   4. D.$\mathrm{C}{\mathrm{O}}_2>\mathrm{CFC}>{\mathrm{N}}_2\mathrm{O}>\mathrm{C}{\mathrm{H}}_4$
   Show answer

   Answer: B