Environmental Chemistry · JEE Main previous year questions

2020 3 questions

1. Q692020 · 6 Sept 2020 · Shift 1

   The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is :

   1. A.safe for teeth
   2. B.harmful to skin
   3. C.harmful for teeth
   4. D.harmful to bones
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   Answer: A

2. Q672020 · 3 Sept 2020 · Shift 2

   The incorrect statement(s) among (a) – (d) regarding acid rain is (are) : (a) It can corrode water pipes. (b) It can damage structures made up of stone. (c) It cannot cause respiratory ailments in animals. (d) It is not harmful for trees

   1. A.(c) and (d)
   2. B.(a), (b) and (d)
   3. C.(c) only
   4. D.(a), (c) and (d)
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   Answer: A

3. Q672020 · 8 Jan 2020 · Shift 1

   Among the gases (a) – (e), the gases that cause greenhouse effect are : (a) $\mathrm{C}{\mathrm{O}}_2$ (b) ${\mathrm{H}}_2\mathrm{O}$ (c) CFCs (d) ${\mathrm{O}}_2$ (e) ${\mathrm{O}}_3$

   1. A.(a), (b), (c) and (d)
   2. B.(a) and (d)
   3. C.(a), (b), (c) and (e)
   4. D.(a), (c), (d) and (e)
   Show answer

   Answer: C