National Testing Agency (NTA)12 Questions

Chemistry MCQs

Practice Chemistry multiple-choice questions for National Testing Agency (NTA) competitive exams. Each question includes the correct answer and a short explanation, and past-paper questions are marked so you can revise both repeated and fresh material in one place.

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Proton

Neutron

Electron

Nucleus

ExplanationElectrons are negatively charged subatomic particles that orbit the nucleus of an atom.

ExplanationOn the pH scale, a value of 7 represents neutrality, while values below 7 are acidic and above 7 are basic.

ExplanationOn the pH scale, 7 is the neutral point, representing equal concentrations of H+ and OH- ions.

ExplanationThe symbol Au comes from the Latin word 'aurum'.

Oxygen

Carbon Dioxide

Nitrogen

Hydrogen

ExplanationNitrogen makes up approximately 78% of Earth's atmosphere.

Proton

Neutron

Electron

Positron

ExplanationThe atomic number of an element is defined strictly by the number of protons in the nucleus.

It gains electrons

It loses electrons

It gains protons

It loses neutrons

ExplanationOxidation is defined as the loss of electrons during a chemical reaction.

Helium

Neon

Argon

Krypton

ExplanationAtomic radius increases down a group; Helium is at the top of the noble gas column.

Table salt

Baking soda

Bleach

Vinegar

ExplanationSodium bicarbonate (NaHCO3) is commonly known as baking soda.

Groups

Periods

Families

Blocks

ExplanationHorizontal rows in the periodic table are referred to as periods.

Ionic bond

Covalent bond

Metallic bond

Hydrogen bond

ExplanationCovalent bonds occur when atoms share electrons to achieve stability.

-1

ExplanationElements in their standard state have an oxidation number of zero.

Frequently Asked Questions

Are these Chemistry MCQs free?

Yes. Every Chemistry MCQ on this page is free to practice, including the correct answer and explanation.

Do these include past-paper questions?

Yes — questions sourced from past papers are clearly marked with a "Past Paper" badge, alongside fresh practice questions.

Which exams do these Chemistry MCQs help with?

They are aimed at National Testing Agency (NTA) and related Pakistani competitive exams that test Chemistry.

How should I practice subject-wise MCQs?

Attempt each question first, then reveal the answer and read the explanation. Short, focused sessions on one subject work better than long unstructured reading.