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Statement “Ozone in atmosphere is decrea...

Statement “Ozone in atmosphere is decreased by emission of chloro-fluoro-carbons like `"CCl"_(2)F_(2)` ”

A

Is true

B

Is false

C

Only in presence of `CO_(2)`

D

Only in absence of `CO_(2)`

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Verified by Experts

The correct Answer is:
A
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A chemist while studying the properties of gaseous C_(2)Cl_(2)F_(2) , a chlorofluoro carbon refrigerant, cooled a 1.25 g sample at constant atmospheric pressure of 1.0 atm from 320 K to 290 K . During cooling, the sample volume decreased from 274 to 248 mL . Calculate Delta H and Delta U for the chlorofluoro carbon for this process. For C_(2)Cl_(2)F_(2) , C_(P) = 80.7 J mol^(-1) K^(-1) .

Ozone is an unstable, dark blue diamagnetic gas. It absorbs strongly the UV radiation, thus protecting the people on the earth from the harmful UV radiation from the sun. The use of chlorofluorocarbon (CFC) in aerosols and refrigerators, and their subsequent escape into the atmosphere, is blamed for making holes in the ozone layer over the Antarctic, and Arctic. Ozone acts as a strong oxidizing agent in acidic and alkaline medium. For this property ozone is used as a germicide and disinfectant for sterilizing water and improving the atmosphere of crowded places. which of the following statements is correct ?

The source of carbon is atmospheric CO_2 in

A : Environmental damage has depleted the ozone layer in the atmosphere. R : Increase in ozone decreases the amount of UV radiation to earth.

Consider the following statements: (i) Nuclear fission is normally followed by emission of beta -particles. (ii) Emission of alpha -particle is normally followed by emission of gamma rays. (iii) In carbon-carbon cycle of fusion reaction which powers the large starts, two carbon nuclei combine to form a magnesium nucleus: The correct order of True/False in above statements is

The process of conversion of atmospheric free N_(2) gas to nitrogenous compounds like NH_(3) is termed as

Statement-1 :The thermal stability of hydrides of carbon family is in order: CH_(4)gtSiH_(4)gtGeH_(4)gtSnH_(4)gtPbH_(4) Statement-2: E-H bond dissociation enthalpies of the hydrides of carbon family decrease down the group with increasing atomic size.

Statement-1: Presence of excess of CO_(2) in atmosphere can increase the temperature of earth's atmosphere and Statement-2: CO_(2) is colourless and odourless gas.

Statement-1: Moon has no atmosphere. Statement-2: Due to less gravity moon is unable to retain its atmosphere.

Arrange the following in the decreasing order of their thermal stability of Cl_(2), F_(2), I_(2), Br_(2) .

VMC MODULES ENGLISH-HALOALKANES & HALOARENES -IMPECCABLE
  1. An Alkyl bromide (X) reacts with Na in dry ether to form 4,5-diethloct...

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  2. False statement is:

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  3. Statement “Ozone in atmosphere is decreased by emission of chloro-fluo...

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  4. Number of pi -bonds present in B.H.C. (Benzene hexachloride) are:

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  5. Which of the following are correct statements about C(2)H(5)Br.

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  6. The use of the product obtained as a result of reaction between aceton...

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  7. Chloroform with zinc dust in water gives:

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  8. Chloroform with zinc dust in water gives:

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  9. Gem-dibromide on hydrolysis will give:

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  10. The correct order of C–X bond polarity is:

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  11. For the preparation of alpha -butylene from methyl magnesium chloride...

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  12. R-X + NaOH rarr ROH + Na X, The above reaction is classified as:

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  13. The vapour density of an organic compound is 23.0. It contains 52.17% ...

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  14. Which of the following is a correct statement?:

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  15. The product of the reaction of chloromethane with sodium sulphide is

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  16. When methyl bromide is heated with Zn it gives:

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  17. The order of reactivities of the following alkyl halides for an S(N^2)...

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  18. The compound with highest boiling point is

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  19. The metal that cannot be obtained by electrolysis of an aqueous soluti...

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  20. When CH(3)CH(2) CHCl(2) is treated with "NaNH"(2) , the product formed...

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