JEE Main 2021 (Online) 27th August Morning Shift | Environmental Chemistry Question 42 | Chemistry

This chapter is currently out of syllabus

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)

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Out of Syllabus

The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are :

$$Cl\mathop O\limits^ \bullet + \mathop C\limits^ \bullet {F_2}Cl$$

$$Cl\mathop O\limits^ \bullet + C\mathop {{H_3}}\limits^ \bullet $$

$$\mathop C\limits^ \bullet {H_3} + C\mathop {{F_2}}\limits^ \bullet Cl$$

$$\mathop C\limits^ \bullet l + C\mathop {{F_2}}\limits^ \bullet Cl$$

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)

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Out of Syllabus

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Photochemical smog causes cracking of rubber.

Reason (R) : Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing.

Choose the most appropriate answer from the options given below :

Both (A) and (R) are true but (R) is not the true explanation of (A)

(A) is false but (R) is true.

(A) is true but (R) is false.

Both (A) and (R) are true and (R) is the true explanation of (A)

JEE Main 2021 (Online) 26th August Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

The conversion of hydroxyapatite occurs due to presence of F^$$-$$ ions in water. The correct formula of hydroxyapatite is :

[3Ca₃(PO₄)₂ . Ca(OH)₂]

[3Ca(OH)₂ . CaF₂]

[Ca₃(PO₄)₂ . CaF₂]

[3Ca₃(PO₄)₂ . CaF₂]

JEE Main 2021 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which one of the following statements is NOT correct?

Eutrophication indicates that water body is polluted

The dissolved oxygen concentration below 6 ppm inhibits fish growth

Eutrophication leads to increase in the oxygen level in water

Eutrophication leads to anaerobic conditions

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