1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

Water filled in two glasses A and B have BOD values of 10 and 20, respectively. The correct statement regarding them, is
A
B is more polluted than A.
B
A is suitable for drinking, whereas B is not .
C
Both A and B are suitable for dirnking
D
A is more polluted than B.

Explanation

Two glasses ''A'' and ''B'' have BOD values 10 and ''20'', respectively.

Hence glasses ''B'' is more polluted than glasses ''A''.
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Evening Slot

The reaction that is NOT involved in the ozone layer depletion mechanism in the stratosphere is :
A
$$Cl\mathop O\limits^ \bullet \left( g \right) + O\left( g \right) \to \mathop C\limits^ \bullet l\left( g \right) + {O_2}(g)$$
B
$$C{F_2}C{l_2}\left( g \right)\,\buildrel {uv} \over \longrightarrow \mathop {\,C}\limits^ \bullet l\left( g \right) + \mathop C\limits^ \bullet {F_2}Cl\left( g \right)$$
C
$$C{H_4} + 2{O_3}\, \to \,3C{H_2} = O + 3{H_2}O$$
D
$$HOCl\left( g \right)\,\buildrel {hv} \over \longrightarrow \,\mathop O\limits^ \bullet H\left( g \right) + \mathop C\limits^ \bullet l\left( g \right)$$

Explanation

Ozone layer depletion mechanism occurs with Chlorofluorocarbons and involves chlorine radical.

In CH4, there is no Cl so it is not involved in the ozone layer depletion mechanism
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Morning Slot

The concentration of dissolved oxygen (DO) in cold water can go upto :
A
14 ppm
B
16 ppm
C
8 ppm
D
10 ppm

Explanation

In cold water, dissolved oxygen (DO) can reach a concentration upto 10 ppm.
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Morning Slot

Peroxyacetyl nitrate (PAN), an eye irritant is produced by :
A
classical smog
B
acid rain
C
photochemical smog
D
organic waste

Explanation

Photochemical smog produce chemicals such as formaldehyde, acrolein and peroxyacetyl nitrate(PAN).

Questions Asked from Environmental Chemistry

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