Chemistry Mcqs - Pak Mcqs Point

Most Important Chemistry Mcqs

1- What is the maximum number of electrons that can occupy the third shell (n=3) of an atom ?

A. 2

B. 8

C. 18

D. 32

View Answer

Answer : C. 18

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2- Which subatomic particle has no charge ?

A. Proton

B. Neutron

C. Electron

D. Positron

View Answer

Answer : B. Neutron

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3- Which element has the highest electronegativity ?

A. Chlorine

B. Fluorine

C. Oxygen

D. Nitrogen

View Answer

Answer : B. Fluorine

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4- Which group of elements is known as the alkali metals ?

A. Group 1

B. Group 2

C. Group 17

D. Group 18

View Answer

Answer : A. Group 1

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5- What type of bond is formed between a metal and a non-metal ?

A. Ionic

B. Covalent

C. Metallic

D. Hydrogen

View Answer

Answer : A. Ionic

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6- Which molecule has a trigonal planar shape ?

A. CH₄

B. NH₃

C. H₂O

D. BF₃

View Answer

Answer : D. BF₃

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7- Which state of matter has the least intermolecular forces?

A. Plasma

B. Solid

C. Liquid

D. Gas

View Answer

Answer : A. Plasma

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8- What is the process called when a gas turns directly into a solid ?

A. Deposition

B. Sublimation

C. Freezing

D. Condensation

View Answer

Answer : A. Deposition

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9- What type of reaction is: 2H₂ + O₂ → 2H₂O ?

A. Decomposition

B. Combination

C. Displacement

D. Neutralization

View Answer

Answer : B. Combination

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10- What is the product of a neutralization reaction between an acid and a base ?

A. Only salt

B. Water and gas

C. Salt and gas

D. Salt and water

View Answer

Answer : D. Salt and water

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11- What is the pH of a neutral solution ?

A. 0

B. 7

C. 14

D. 10

View Answer

Answer : B. 7

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12- Which of the following is a strong acid ?

A. Acetic acid

B. Citric acid

C. Carbonic acid

D. Hydrochloric acid

View Answer

Answer : D. Hydrochloric acid

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13- Which law of thermodynamics states that energy cannot be created or destroyed ?

A. Zeroth Law

B. First Law

C. Second Law

D. Third Law

View Answer

Answer : B. First Law

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14- What is the SI unit of entropy ?

A. Joule

B. Kelvin

C. Joule/Kelvin

D. Pascal

View Answer

Answer : C. Joule/Kelvin

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15- What is the oxidation state of sulfur in H₂SO₄ ?

A. +2

B. +4

C. +6

D. -2

View Answer

Answer : C. +6

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16- In an electrolytic cell, oxidation occurs at:

A. Anode

B. Cathode

C. Both A and B

D. None of these

View Answer

Answer : C. Both A and B

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17- Which functional group is present in alcohols ?

A. -COOH

B. -OH

C. -CHO

D. -NH₂

View Answer

Answer : B. -OH

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18- What is the IUPAC name of CH₃-CH₂-CH₂-CH₃ ?

A. Methane

B. Ethane

C. Propane

D. Butane

View Answer

Answer : D. Butane

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19- Which gas is primarily responsible for global warming ?

A. Oxygen

B. Nitrogen

C. Hydrogen

D. Carbon dioxide

View Answer

Answer : D. Carbon dioxide

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20- What is the main component of photochemical smog ?

A. Ozone

B. Sulfur dioxide

C. Nitrogen dioxide

D. Carbon monoxide

View Answer

Answer : A. Ozone

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