Chemistry MCQs

Page No. 74

Newspaper can be recycled again and again how many times ?


a2


b3


c4


d5


View Answer 5

In the purification of portable water the coagulant used is_________________?


aalum


bnickel sulphate


ccopper sulphate


dbarium sulphate


View Answer alum

Which statement is wrong ?


athe amount of ozone layer is greater in the region close to the equator


bozone acts as filter for UV radiations


cin the equatorial region it acts as pollutant


dCFCs play effective role in removing O3 in the stratosphere



Which of the following air pollutants is more dangerous for ozone layer ?


aCFC


bCO2


cCO


dOxides of nitrogen


View Answer CFC

In which of the following layer of atmosphere there is more thickness of ozone layer ?


atropoosphere


bstratosphere


cmesosphere


dphotosphere


View Answer stratosphere

Which of the following is not a condition for the formation of smog ?


asufficient NO


bsunlight


cless movement of air


dwinds


View Answer winds

Acid present in acid rain may be__________________?


aH2SO4


bHNO3


cBoth A and B


dNone


View Answer Both A and B

Hypochlorous acid is used for disinfecting the water it reacts with the dissolved ammonia producing___________________?


aNH2CI


bNHCI2


cNCI2


dAll of the above


View Answer All of the above

Residence time of methane in the atmosphere is___________________?


a3 – 7 days


b2 -3 days


c3 – 7 years


d2 -3 years


View Answer 3 – 7 years

Three elements needed for the healthy growth of plants are_________________?


aN P K


bN K C


cN S P


dN Ca P


View Answer N P K

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