1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Evening Slot

The higher concentration of which gas in air can cause stiffness of flower buds ?
A
CO2
B
SO2
C
NO2
D
CO

Explanation

Due to acid rain in plants high concentration of SO2 makes the flower buds stiff and makes them fall.
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Evening Slot

Taj Mahal is being slowly disfigured and discoloured. This is primarily due to :
A
acid rain
B
soil pollution
C
global warming
D
water pollution

Explanation

Taj mahal is slowely disfigured and discoloured due to acid rain.

The primary acid component of acid rain is sulfuric acid(H2SO4) which reacts with Marble(CaCO3) and gives aqueous ion. This aqueous ions get washed away in the water flow and marble get disfigured and discoloured.

CaCO3(s) + H2SO4 $$ \to $$

Ca2+(aq) + SO42-(aq) + H2O + CO2
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 12th January Morning Slot

The molecule that has minimum /no role in the formation of photochemical smog, is -
A
CH2 = O
B
O3
C
N2
D
NO

Explanation

Photochemical smog is produced when ultraviolet light from sun reacts with NO , O3 and hydrocarbon in atmosphere.
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 12th January Morning Slot

Water samples with BOD values of 4 ppm and 18 ppm, respectively are -
A
Clean and Highly polluted
B
Highly polluted and Clean
C
Highly polluted and Highly polluted
D
Clean and Clean

Explanation

Clean water would have BOD value of less than 5 ppm whereas highly polluted water could have a BOD value of 17 ppm or more.

Questions Asked from Environmental Chemistry

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