JEE Main 2021 (Online) 24th February Morning Shift | Environmental Chemistry Question 40 | Chemistry

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JEE Main 2021 (Online) 24th February Morning Shift

MCQ (Single Correct Answer)

-1

The gas released during anaerobic degradation of vegetation may lead to :

Ozone hole

Corrosion of metals

Acid rain

Global warming and cancer

JEE Main 2020 (Online) 6th September Morning Slot

MCQ (Single Correct Answer)

-1

The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is :

safe for teeth

harmful to skin

harmful for teeth

harmful to bones

JEE Main 2020 (Online) 5th September Morning Slot

MCQ (Single Correct Answer)

-1

The condition that indicates a polluted environment is :

BOD value of 5 ppm

eutrophication

0.03% of CO₂ in the atmosphere

pH of rain water to be 5.6

JEE Main 2020 (Online) 4th September Evening Slot

MCQ (Single Correct Answer)

-1

The processes of calcination and roasting in metallurgical industries, respectively, can Iead to :

Global warming and photochemical smog

Photochemical smog and ozone layer depletion

Photochemical smog and global warming

Global warming and acid rain

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