JEE Main 2020 (Online) 6th September Morning Slot | Environmental Chemistry Question 41 | Chemistry

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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

JEE Main 2020 (Online) 4th September Morning Slot

MCQ (Single Correct Answer)

-1

Match the following :

(i) Foam	(a) smoke
(ii) Gel	(b) cell fluid
(iii) Aerosol	(c) jellies
(iv) Emulsion	(d) rubber
	(e) froth
	(f) Milk

(i)-(e), (ii)-(c), (iii)-(a), (iv)-(f)

(i)-(d), (ii)-(b), (iii)-(a), (iv)-(e)

(i)-(d), (ii)-(b), (iii)-(e), (iv)-(f)

(i)-(b), (ii)-(c), (iii)-(e), (iv)-(d)

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