Fundamentals of Environmental Chemistry - Environmental Chemistry - Environmental Science & Engineering Previous Year Questions

1

2024 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2024

The maximum coordination number of Sr^{2+} is _____.

A

4

B

8

C

6

D

2

Open complete paper

2

2024 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2024

The ionic strength of a solution containing 0.01M of CaCl2 and 0.001M of Na2SO4 is __________ M (rounded off to 3 decimal places).

Check answer

Open complete paper

3

2024 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2024

A person consumes 2.5 liters of water per day. The water quality test indicated that the supplied water has a Pb concentration of 0.6 mg/L. If the weight of the person is 75 kg, the exposure level for Pb for this person from this drinking water source is ______mg/kg/day (rounded off to 2 decimal places).

Check answer

Open complete paper

4

2024 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2024

Initially a bottle contained 400 g of ethanol. Half of ethanol was used by a student for preparing the stock solution in an environmental chemistry laboratory just before summer vacation of 90 days. After completing the procedure, the student left the bottle uncorked. If the unsealed bottle losses ethanol at a rate of 0.5 g/day, the ethanol that will be left in the bottle at the end of the summer vacation is ______ g (an integer value).

Check answer

Open complete paper

5

2025 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2025

Choose the redox reaction from the following

A

\(H_2CO_3 \leftrightarrow H^+ + HCO_3^-\)

B

\(Hg^{2+} + 2 OH^- \leftrightarrow Hg(OH)_2\)

C

\(C_6H_{12}O_6 + 6 O_2 \leftrightarrow 6 CO_2 + 6 H_2O\)

D

\(CaCO_3 (s) \leftrightarrow Ca^{2+} + CO_3^{2-}\)

Open complete paper

6

2025 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2025

Choose the correct option(s) from the following regarding cumulative toxicity

A

Bioaccumulation is the process by which a living organism keeps on accumulating pollutants in its body due to continuous exposure, whereas, bio-magnification is the process by which higher order organisms accumulate more pollutants than the lower order organisms in a food chain.

B

Biomagnification is the process by which a living organism keeps on accumulating pollutants in its body due to continuous exposure, whereas, bioaccumulation is the process by which higher order organisms accumulate more pollutants than the lower order organisms in a food chain.

C

Bioaccumulation and biomagnification are possible with heavy metals, but not with pesticides and pharmaceutical compounds.

D

Bioaccumulation and biomagnification are possible with heavy metals, pesticides and pharmaceutical compounds.

Check answer

Open complete paper

7

2025 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2025

Choose the correct option(s) from the following regarding the solubility in water

A

Water is a polar molecule because of the asymmetric distribution of charge between the oxygen and hydrogen atoms of the water molecule.

B

In a water molecule, the electrons shared between oxygen and hydrogen are attracted more towards the hydrogen atom.

C

Non-polar compounds are highly soluble in water because of their strong interaction with water molecules.

D

Aromaticity and charge of molecules influence their solubility in water.

Check answer

Open complete paper

8

2025 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2025

Water from a hand pump located near a landfill has 1 mg/L arsenic (oral carcinogenic potency factor = 1.75 (kg·day)/mg). A person who lives nearby drinks 2 L/day water from this hand pump for 10 years. Assume body weight of 70 kg and 70 years as average life duration. Chances of this person getting excess risk of cancer is ______ ×10⁻⁵. (rounded off to three decimal places)

Check answer

Open complete paper

9

2021 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2021

The oxidation states of ‘N’ in NH₄⁺, NO₂⁻, and NO are __________, respectively.

A

+2, –3, and +3

B

–3, +3, and +2

C

–3, +3, and –4

D

+4, –2, and +2

Open complete paper

10

2022 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2022

If G represents Gibbs free energy, select the correct statement(s)

A

If ΔG = 0, reaction will proceed only in one direction

B

If ΔG = 0, reaction will be in equilibrium

C

If ΔG < 0, reaction will proceed forward

D

If ΔG > 0, reaction will not proceed forward

Check answer

Open complete paper

11

2023 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2023

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 transfer

A

J – ii; K – i; L – iv; M – iii

B

J – iii; K – ii; L – i; M – iv

C

J – ii; K – iii; L – iv; M – i

D

J – i; K – iv; L – ii; M – iii

Open complete paper

12

2026 · Environmental Science & Engineering · Environmental Chemistry · Fundamentals of Environmental Chemistry

Environmental Science & Engineering (ES) 2026

In the reversible reaction shown below, \(k_f\) is the forward reaction rate constant and \(k_r\) is the reverse reaction rate constant.
The CORRECT expression representing the reaction equilibrium constant is ____.\[A + B \overset{k_f}{\underset{k_r}{\rightleftharpoons}} C + D\]

A

\(k_f + k_r\)

B

\(k_f \times k_r\)

C

\(\frac{k_f}{k_r}\)

D

\(\frac{k_r}{k_f}\)

Open complete paper