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When heathly earth's stratosphere contai...

When heathly earth's stratosphere contains a low concentration of ozone`(O_(3))` that absorbs potentially harmful ultraviolet (UV) radiations by the cycle shown below:

Chloroflouro carbon refrigerants, such as freon `12(CF_(2)Cl_(2))`, are stable in lower atmosphere but in the stratosphere, they absorb high energy UV radiation to generate chlorine radicals.
`CF_(2)Cl_(2) overset(hv)(to) CF_(2)Cl+Cl`
The presence of small number of chlorine radicals appears to lower ozone concentrations dramatically. The following reactions are all known to be exothermic (except the one requiring light) and to have high rate constant.
`A:Cl-O-O-Cloverset(hv)(to)O_(2)+2Cl^(*)`
`B: Cl_O^(*)+O to O_(2)+Cl^(*)`
`C:Cl^(*)+O_(3) to Cl-O^(*)+O_(2)`
`D:2Cl-O^(*) to Cl-O-O-Cl`
Q. Ozone has the ability to absorb

A

UV radiations

B

electromagnetic radiations

C

CFC

D

green house gases

Text Solution

Verified by Experts

The correct Answer is:
A
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When heathly earth's stratosphere contains a low concentration of ozone (O_(3)) that absorbs potentially harmful ultraviolet (UV) radiations by the cycle shown below: Chloroflouro carbon refrigerants, such as freon 12(CF_(2)Cl_(2)) , are stable in lower atmosphere but in the stratosphere, they absorb high energy UV radiation to generate chlorine radicals. CF_(2)Cl_(2) overset(hv)(to) CF_(2)Cl+Cl The presence of small number of chlorine radicals appears to lower ozone concentrations dramatically. The following reactions are all known to be exothermic (except the one requiring light) and to have high rate constant. A:Cl-O-O-Cloverset(hv)(to)O_(2)+2Cl^(*) B: Cl_O^(*)+O to O_(2)+Cl^(*) C:Cl^(*)+O_(3) to Cl-O^(*)+O_(2) D:2Cl-O^(*) to Cl-O-O-Cl Q. Inceased UV radiations due to hole in ozone layer:

UV radiations in the stratosphere are absorbed by

In the reaction, Cl_(2)+CH_(4)overset(hv)toCH_(3)Cl+HCl presence of a small amount of oxygen

Ozone saves the biosphere by absorbing the high energy radiation called:

UV radiations absorbed by ozone layer are

CF_(2)CI_(2) is used as an // a

CF_(2) = CF_(2) is a monomer of

CF_(2) = CF_(2) is a monomer of

The air of earth's atmosphere responsible for absorbing a large portion of ultraviolet radiations by the sun is

The reaction, CH_4+Cl_2 overset("hv") to , CH_3 Cl+HCl, occurs through

Knowledge Check

  • In the reaction, Cl_(2)+CH_(4)overset(hv)toCH_(3)Cl+HCl presence of a small amount of oxygen

    A
    increases the rate of reaction for a brief period of time
    B
    decreases the rate of reaction for a brief period of time
    C
    does not affect the rate of reaction
    D
    completely stops the reaction

  • The reaction, CH_4+Cl_2 overset("hv") to , CH_3 Cl+HCl, occurs through

    A
    electrophilic substitution
    B
    nucleophilic substitution
    C
    free radical substitution
    D
    none of the above.