Tiêu đề DPP 2 Solutions.pdf ✅

Class : XIth Subject : CHEMISTRY Date : DPP No. : 2 2 (a) In stratosphere, chlorofluorocarbons (CF2Cl2, CFCl2) etc. are responsible for the depletion of ozone layer 3 (c) When a pesticide such as DDT passes from lower tropic level to higher level, through food chain, the amount of pesticide per unit weight of organism increases due to accumulation in fat. This process is called biomagnification 4 (d) PSCs (polar stratospheric clouds) of type II provide a surface for the conversion of chlorine nitrate (ClONO2) and HCl into HOCL and Cl2 ClONO2 + H2O PSCs HOCl + HNO3 ClONO2 + HCl→Cl2 + HNO3 5 (d) ClONO2 + H2O→HOCl + HNO3 ClONO2 +HCl→Cl2 +HNO3 HOCl and Cl2 can get converted into chlorine radicals and thus, responsible for O3 depletion. 9 (b) The term acid rain was coined by ‘Robert Augus’ 15 (a) Ozone layer is found in the stratosphere region of atmosphere. It prevents harmful UV radiation from coming to earth. 19 (b) In, stratosphere, at about 20 to 40 km, there is a part of relatively high ozone concentration, called ozone layer Topic :- Environmental Chemistry Solutions