Assertion : Ozone is destroyed by CFCs in the upper stratosphere.

Reason : Ozone holes increase the amount of UV radiation reaching the earth.

• Assertion and reason are incorrect.

• Assertion is false, but the reason is correct.

• Assertion and reason are correct and the reason is the correct explanation for the assertion.

• Assertion and reason are correct, but the reason is not the explanation for the assertion.

Which is wrong with respect to our responsibility as a human being to protect our environment ?

• Avoiding the use of floodlighted facilities

• Setting up compost tin in gardens

• Restricting the use of vehicles

• Using plastic bags

The layer of atmosphere between 10 km to 50 km above the sea level is called as :

• Thermosphere

• Troposhere

• Mesosphere

• Stratosphere

Excessive release of CO₂ into the atmosphere results in

• depletion of ozone

• polar vertex

• formation of smog

• global warming

The regions of the atmosphere , Where clouds form where we live repectively, are

• Troposphere and stratosphere

• Stratosphere and Troposphere

• Stratosphere and Stratosphere

• Troposphere and Troposphere

Air pollution that occurs in sunlight is :

• Oxidising smog

• Reducing smog

• Fog

• Acid rain

The noble gas that does NOT occur in the atmosphere is :

• Ne

• He

• Kr

• Ra

Which one of the following is not a common component of photochemical smog?

• Ozone

• Acrolein

• Peroxyacetyl nitrate

• Peroxyacetyl nitrate

159.

Which one of  the following statements regarding photochemical smog is not correct?

• Carbon monoxide does not play any role in photochemical smog formation

• Photochemical smog is an oxidising agent in character

• Photochemical smog is formed through photochemical reaction involving solar energy

• Photochemical smog is formed through photochemical reaction involving solar energy

Green chemistry means such reactions which 

• produce colour during reactions

• reduce the use and production of hazardous chemicals

• are related to the depletion of the ozone layer

• are related to the depletion of the ozone layer