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Home / Interview Subjects / Chemistry
WithoutBook LIVE Mock Interviews Chemistry Related interview subjects: 74

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Know the top Chemistry interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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The Best LIVE Mock Interview - You should go through before interview

Know the top Chemistry interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Experienced / Expert level questions & answers

Ques 1

What is the Aufbau principle in electron configuration?

The Aufbau principle states that electrons fill orbitals in order of increasing energy, starting with the lowest energy level.

Example:

For carbon (C), the electron configuration is 1s² 2s² 2p², following the Aufbau principle.
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Ques 2

Explain the concept of entropy in thermodynamics.

Entropy is a measure of the disorder or randomness in a system. In thermodynamics, systems tend to move towards higher entropy.

Example:

Melting ice increases entropy as the solid structure becomes more disordered.
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Ques 3

What is the Pauli exclusion principle?

The Pauli exclusion principle states that no two electrons in an atom can have the same set of four quantum numbers.

Example:

In an orbital, electrons must have opposite spins to obey the Pauli exclusion principle.
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Ques 4

Define Gibbs free energy and its significance in chemical reactions.

Gibbs free energy is a thermodynamic potential that measures the maximum reversible work that can be performed by a system at constant temperature and pressure.

Example:

A negative ΔG indicates a spontaneous reaction.
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Ques 5

What is the Heisenberg uncertainty principle?

The Heisenberg uncertainty principle states that it is impossible to simultaneously know both the exact position and momentum of a particle with absolute certainty.

Example:

The more accurately we measure a particle's position, the less accurately we can know its momentum, and vice versa.
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Ques 6

Define the terms endergonic and exergonic in biochemistry.

Endergonic reactions require an input of energy to proceed, while exergonic reactions release energy.

Example:

Photosynthesis is an endergonic process, absorbing sunlight to produce glucose. Cellular respiration is exergonic, releasing energy from glucose.
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Ques 7

Explain the concept of photochemical reactions.

Photochemical reactions are chemical reactions that are initiated by the absorption of light. They often involve the breaking or formation of bonds.

Example:

Photosynthesis is a photochemical process where light energy is used to convert carbon dioxide and water into glucose and oxygen.
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Ques 8

Explain the concept of chirality in organic chemistry.

Chirality refers to the property of molecules that are non-superimposable on their mirror images. Chiral molecules often have a central asymmetric carbon atom.

Example:

The amino acid alanine is chiral, with a central carbon bonded to four different groups (H, NH2, COOH, and a side chain).
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Ques 9

Explain the concept of the Heisenberg uncertainty principle.

The Heisenberg uncertainty principle states that it is impossible to simultaneously know both the exact position and momentum of a particle with absolute certainty.

Example:

The more accurately we measure a particle's position, the less accurately we can know its momentum, and vice versa.
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