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Chemistry MCQs

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Which gas is responsible for the pungent smell in rotten eggs?

A Ammonia
B Methane
C Sulfur dioxide
D Hydrogen sulfide

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Correct Answer: Option D — Hydrogen sulfide

Explanation: Hydrogen sulfide gas produces the characteristic pungent odor of rotten eggs. This toxic gas is produced during the decomposition of organic matter and can be found in sewage, swamps, and certain industrial processes.

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Easy pms Uploaded: 06 Aug 2026

Which of the following is a greenhouse gas?

A Carbon dioxide
B Nitrogen
C Argon
D Helium

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Correct Answer: Option A — Carbon dioxide

Explanation: Carbon dioxide traps heat in Earth's atmosphere, contributing to the greenhouse effect and global warming. It is released through natural processes and human activities such as burning fossil fuels and deforestation.

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Hard pms Uploaded: 07 Aug 2026

Which element is used as a moderator in nuclear reactors?

A Uranium
B Plutonium
C Graphite
D Cadmium

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Correct Answer: Option C — Graphite

Explanation: Graphite is commonly used as a moderator in nuclear reactors to slow down fast neutrons, increasing the probability of sustaining a controlled nuclear fission chain reaction without absorbing too many neutrons itself.

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Hard pms Uploaded: 07 Aug 2026

Which of these compounds is an example of an ester?

A Ethanol
B Ethanoic acid
C Ethyl ethanoate
D Ethylene

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Correct Answer: Option C — Ethyl ethanoate

Explanation: Ethyl ethanoate is an example of an ester, formed through the reaction between an alcohol and a carboxylic acid. Esters are known for their characteristic fruity smells and are widely used in flavorings and perfumes.

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Which element is used in the production of stainless steel to prevent rusting?

A Zinc
B Chromium
C Copper
D Tin

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Correct Answer: Option B — Chromium

Explanation: Chromium is added to steel to produce stainless steel, forming a thin protective oxide layer on the surface that prevents corrosion and rusting. This alloy is widely used in kitchenware, medical instruments, and construction.

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Which element is known as the 'King of Chemicals'?

A Hydrochloric acid
B Acetic acid
C Nitric acid
D Sulfuric acid

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Correct Answer: Option D — Sulfuric acid

Explanation: Sulfuric acid is called the 'King of Chemicals' due to its widespread industrial use in fertilizer production, petroleum refining, and manufacturing. Its global production volume reflects its importance in the chemical industry.

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What is the main component of natural gas?

A Propane
B Butane
C Ethane
D Methane

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Correct Answer: Option D — Methane

Explanation: Methane is the primary component of natural gas, making up the majority of its composition. It is a simple hydrocarbon consisting of one carbon atom bonded to four hydrogen atoms and burns cleanly as fuel.

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Easy pms Uploaded: 06 Aug 2026

Which element is the lightest gas known?

A Helium
B Hydrogen
C Nitrogen
D Oxygen

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Correct Answer: Option B — Hydrogen

Explanation: Hydrogen is the lightest and most abundant element in the universe, consisting of just one proton and one electron. Due to its low density, hydrogen gas rises quickly in air and is used in various industrial applications.

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Hard pms Uploaded: 06 Aug 2026

What is the primary use of sulfuric acid in industry?

A Textile dyeing
B Food preservation
C Water purification
D Fertilizer production

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Correct Answer: Option D — Fertilizer production

Explanation: Sulfuric acid is extensively used in the production of phosphate fertilizers, making it one of the most important industrial chemicals worldwide. It is also used in battery manufacturing, metal processing, and petroleum refining.

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Hard pms Uploaded: 07 Aug 2026

Which of the following elements is used in the vulcanization of rubber?

A Phosphorus
B Sulfur
C Silicon
D Carbon

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Correct Answer: Option B — Sulfur

Explanation: Sulfur is used in the vulcanization process to strengthen rubber by forming cross-links between polymer chains. This process, discovered by Charles Goodyear, significantly improves the durability and elasticity of rubber products.

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Medium pms Uploaded: 07 Aug 2026

Which element is primarily used in nuclear power plants as fuel?

A Uranium
B Thorium
C Radium
D Plutonium

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Correct Answer: Option A — Uranium

Explanation: Uranium is the primary fuel used in nuclear power plants due to its ability to undergo controlled nuclear fission, releasing large amounts of energy. Uranium-235 is the specific isotope commonly used in reactor fuel rods.

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Easy pms Uploaded: 06 Aug 2026

What is the chemical symbol for Sodium?

A So
B Na
C Sd
D Su

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Correct Answer: Option B — Na

Explanation: Sodium's chemical symbol Na comes from its Latin name 'natrium'. It is a highly reactive alkali metal in group 1 of the periodic table and is essential for nerve function in the human body.

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Hard pms Uploaded: 06 Aug 2026

Which of the following elements is a metalloid?

A Silicon
B Sodium
C Sulfur
D Silver

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Correct Answer: Option A — Silicon

Explanation: Silicon is classified as a metalloid because it exhibits properties intermediate between metals and nonmetals. It is widely used in the electronics industry as a semiconductor material for computer chips and solar panels.

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Which of the following is a noble gas?

A Chlorine
B Neon
C Sulfur
D Phosphorus

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Correct Answer: Option B — Neon

Explanation: Neon is a noble gas found in group 18 of the periodic table. Noble gases have a full outer electron shell, making them extremely stable and largely unreactive under normal conditions, unlike chlorine, sulfur, or phosphorus.

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What is the chemical symbol for Potassium?

A Po
B Pt
C K
D P

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Correct Answer: Option C — K

Explanation: Potassium's chemical symbol K comes from its Latin name 'kalium'. It is a soft, silvery alkali metal essential for nerve function and muscle contraction in living organisms, and is highly reactive with water.

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Which process involves the splitting of a heavy nucleus into smaller nuclei?

A Beta decay
B Nuclear fusion
C Nuclear fission
D Radioactive decay

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Correct Answer: Option C — Nuclear fission

Explanation: Nuclear fission is the process where a heavy atomic nucleus splits into two or more smaller nuclei, releasing significant amounts of energy. This reaction powers nuclear reactors and was used in early atomic weapons.

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Which gas is used in the manufacture of fertilizers?

A Oxygen
B Ammonia
C Chlorine
D Helium

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Correct Answer: Option B — Ammonia

Explanation: Ammonia is a key raw material in fertilizer manufacturing, providing the nitrogen that plants require for growth. It is synthesized industrially through the Haber process, combining atmospheric nitrogen with hydrogen gas.

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Medium pms Uploaded: 06 Aug 2026

What is the valency of Oxygen?

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Correct Answer: Option C — 2

Explanation: Oxygen typically has a valency of 2, meaning it forms two bonds to complete its outer electron shell of eight electrons. This is why oxygen commonly forms compounds like water (H2O) and carbon dioxide (CO2).

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Medium pms Uploaded: 06 Aug 2026

Which of the following is an example of an organic compound?

A Sodium chloride
B Glucose
C Water
D Carbon dioxide

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Correct Answer: Option B — Glucose

Explanation: Glucose is an organic compound because it contains carbon atoms bonded to hydrogen and oxygen in a specific structural arrangement. Organic chemistry primarily studies carbon-based compounds found in living organisms and their derivatives.

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