Chemistry MCQs

Page No. 74

Newspaper can be recycled again and again how many times ?


a2

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b3

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c4

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d5

✓


View Answer 5

In the purification of portable water the coagulant used is_________________?


aalum

✓


bnickel sulphate

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ccopper sulphate

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dbarium sulphate

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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

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cin the equatorial region it acts as pollutant

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dCFCs play effective role in removing O3 in the stratosphere

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


aCFC

✓


bCO2

✖


cCO

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dOxides of nitrogen

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View Answer CFC

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


atropoosphere

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bstratosphere

✓


cmesosphere

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dphotosphere

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View Answer stratosphere

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


asufficient NO

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bsunlight

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cless movement of air

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dwinds

✓


View Answer winds

Acid present in acid rain may be__________________?


aH2SO4

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bHNO3

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cBoth A and B

✓


dNone

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View Answer Both A and B

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


aNH2CI

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bNHCI2

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cNCI2

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dAll of the above

✓


View Answer All of the above

Residence time of methane in the atmosphere is___________________?


a3 – 7 days

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b2 -3 days

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c3 – 7 years

✓


d2 -3 years

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View Answer 3 – 7 years

Three elements needed for the healthy growth of plants are_________________?


aN P K

✓


bN K C

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cN S P

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dN Ca P

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View Answer N P K

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