GATE Overflow for GATE ESE - Recent activity in Atmospheric Chemistry

Edited: GATE ES 2026 | Question: 39

Wed, 15 Apr 2026 10:58:24 +0000

The mixing ratio of $\mathrm{CO}_{2}$ at a pressure of $1$ $\mathrm{atm}$ and at $300$ $\mathrm{K}$ is reported as $340$ $\mathrm{ppmv}$.

Considering ideal gas conditions, the equivalent concentration of $\mathrm{CO}_{2}$ in air is $\_\_\_\_\_\_$

$\mathrm{mg} / \mathrm{m}^{3}$ (rounded off to two decimal places).

The molecular weight of $\mathrm{CO}_{2}=44 \mathrm{~g} / \mathrm{mol}$

Universal gas constant $=8.314 \mathrm{~J} / \mathrm{mol}-\mathrm{K}$

Edited: GATE ES 2026 | Question: 18

Wed, 15 Apr 2026 09:49:17 +0000

Which of the following chemical reactions is/are related to smog formation in the troposphere?

$\mathrm{CFCl}_{3}+h v \rightarrow \mathrm{CFCl}_{2}+\mathrm{Cl} \cdot$
$\mathrm{CH}_{3} \mathrm{O}_{2}+\mathrm{NO}+\mathrm{O}_{2} \rightarrow \mathrm{HCHO}+\mathrm{HO}_{2}+\mathrm{NO}_{2}$
$\mathrm{NO}_{2}+\mathrm{O}_{2}+h v \xrightarrow{M} \mathrm{O}_{3}+\mathrm{NO}$
$\mathrm{CH}_{4}+8 \mathrm{O}_{2} \rightarrow \mathrm{CO}+\mathrm{H}_{2} \mathrm{O}+2 \mathrm{OH} \cdot+4 \mathrm{O}_{3}$

Edited: GATE ES 2026 | Question: 12

Wed, 15 Apr 2026 09:37:43 +0000

The general atmospheric composition of gases in the decreasing order is $\_\_\_\_$.

$\mathrm{N}_{2}>\mathrm{O}_{2}>\mathrm{CO}>\mathrm{CO}_{2}>\mathrm{NH}_{3}$
$\mathrm{N}_{2}>\mathrm{O}_{2}>\mathrm{CO}_{2}>\mathrm{CO}>\mathrm{NH}_{3}$
$\mathrm{N}_{2}>\mathrm{CO}_{2}>\mathrm{O}_{2}>\mathrm{NH}_{3}>\mathrm{CO}$
$\mathrm{N}_{2}>\mathrm{CO}_{2}>\mathrm{NH}_{3}>\mathrm{CO}>\mathrm{O}_{2}$

Edited: GATE ES 2025 | Question: 49

Mon, 02 Jun 2025 20:03:00 +0000

A boiler burns coal at a rate of $1 \mathrm{~kg} / \mathrm{s}$. If the coal has $3 \%$ sulfur content, assuming that there is no sulfur in ash, $\mathrm{SO}_{2}$ emitted is $\_\_\_\_\_\_ \: \mathrm{kg} /$ day. (rounded off to nearest integer)

Recategorized: GATE ES 2024 | Question: 7

Mon, 21 Apr 2025 17:04:39 +0000

Crown corrosion of reinforced cement concrete sewer is caused by ___________.

sulfur oxidizing bacteria
iron oxidizing bacteria
denitrifying bacteria
fermentative bacteria

Recategorized: GATE ES 2024 | Question: 9

Mon, 21 Apr 2025 17:04:12 +0000

The environmental temperature increases by $6^{\circ} \mathrm{C} / \mathrm{km}$ with height at a particular location. The stability condition of the atmosphere at the location is

stable
unstable
inversion
neutral

Recategorized: GATE ES 2024 | Question: 42

Mon, 21 Apr 2025 17:02:31 +0000

The concentration of Ozone corresponding to a mixing ratio of $120 \mathrm{ppbv}$ at pressure of $1$ atmosphere and temperature of $25^{\circ} \mathrm{C}$ is ________ $\mu \mathrm{g} / \mathrm{m}^{3}$ $\text{(rounded off to $1$ decimal place)}$.

Atomic weight of oxygen $=16 ; \mathrm{R}=8.314 \mathrm{~J} / \mathrm{K}-\mathrm{g}$. mole.

Recategorized: GATE ES 2023 | Question: 31

Mon, 21 Apr 2025 17:00:06 +0000

Match the following

J) Dalton's law	i) Diffusion
K) Fick's law	ii) Pressure exerted by a mixture of gases
L) Henry's law	iii) Gravitational settling
M) Stoke's law	iv) Gas-liquid phase transfe

$\mathrm{J}-\mathrm{ii} ; \mathrm{K}-\mathrm{i} ; \mathrm{L}-\mathrm{iv} ; \mathrm{M}-\mathrm{iii}$
$\mathrm{J}-\mathrm{iii} ; \mathrm{K}-\mathrm{ii} ; \mathrm{L}-\mathrm{i} ; \mathrm{M}-\mathrm{iv}$
$\mathrm{J}-\mathrm{ii} ; \mathrm{K}-\mathrm{iii} ; \mathrm{L}-\mathrm{iv} ; \mathrm{M}-\mathrm{i}$
$\mathrm{J}-\mathrm{i} ; \mathrm{K}-\mathrm{iv} ; \mathrm{L}-\mathrm{ii} ; \mathrm{M}-\mathrm{iii}$

Recategorized: GATE ES 2023 | Question: 49

Mon, 21 Apr 2025 16:59:14 +0000

In a $30 \mathrm{~m}^{3}$ room, a stove in operation consumes wood at the rate of $0.25 \mathrm{~kg} / \mathrm{h}$. The inflow and outflow rate of air in the room is the same, i.e. $500 \mathrm{~m}^{3} / \mathrm{h}$. This stove emits a VOC species at a rate of $0.2 \mathrm{~g} / \mathrm{kg}$-wood. The VOC species gets converted to $\mathrm{CO}_{2}$ at a rate of 0.4 per hour. Given: (i) the air in the room is completely mixed, (ii) initial concentration of the VOC species in the room is negligible, and (iii) concentration of the VOC species in the air entering the room is negligible. The concentration of the VOC species due to two hours of stove operation in the room is ___________ (in $\mu \mathrm{g} / \mathrm{m}^{3}$, $\text{rounded off to one decimal place).}$

Recategorized: GATE ES 2022 | Question: 33

Mon, 21 Apr 2025 16:46:29 +0000

During night, in troposphere, which of the following is/are NOT correct

$\quad \mathrm{NO}_{2}+\mathrm{ho} \rightarrow \mathrm{NO}+\mathrm{O}$
Most of the $\mathrm{NOx}$ (i.e., $\mathrm{NO}+\mathrm{NO}_{2}$ ) converts to $\mathrm{NO}$
$\mathrm{NO}+\mathrm{O}_{3} \rightarrow \mathrm{NO}_{2}+\mathrm{O}_{2}$
Most of the $\mathrm{NOx}$ (i.e., $\mathrm{NO}+\mathrm{NO}_{2}$ ) converts to $\mathrm{NO}_{2}$

Recategorized: GATE ES 2021 | Question: 19

Mon, 21 Apr 2025 15:41:54 +0000

Which of the following is/are both greenhouse gas(es) and ozone depleting substance(s)?

$\text{CFC-11}$
$\mathrm{CO}_{2}$
$\text{HCFC-22}$
$\mathrm{N}_{2} \mathrm{O}$

Recategorized: GATE ES 2021 | Question: 22

Mon, 21 Apr 2025 15:41:46 +0000

A wind rose is a representation of meteorological conditions. Which of the following is/are included in this representation?

Mixing height
Wind speed
Wind direction
Percentage of time