Which gas is released into the atmosphere by the exhaust of supersonic jet planes?

  • A
    $CO$
  • B
    $CO_2$
  • C
    $NO$
  • D
    $SO_2$

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Indiscriminate use of $DDT$ is undesirable because

Match the pollutant in List-$I$ with its maximum permissible limit in drinking water given in List-$II$.
List-$I$List-$II$
$(A)$ Lead$(I)$ $500 \text{ ppm}$
$(B)$ Sulphate$(II)$ $50 \text{ ppm}$
$(C)$ Nitrate$(III)$ $50 \text{ ppb}$

The part of the Earth where life exists,known as the biosphere,is composed of which components?

The stratosphere extends from sea level up to an altitude of $...$ kilometers.

Which among the following statements about ozone depletion is $NOT$ true?

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