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Chemistry MCQs

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Easy nts Uploaded: 07 Aug 2026

What type of bond is formed by the sharing of electrons?

A Metallic bond
B Hydrogen bond
C Ionic bond
D Covalent bond

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Correct Answer: Option D — Covalent bond

Explanation: A covalent bond forms when two atoms share one or more pairs of electrons to achieve stable electron configurations. This type of bonding is common between nonmetal atoms and forms the basis of most organic molecules.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which acid is found naturally in vinegar?

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

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Correct Answer: Option A — Acetic acid

Explanation: Acetic acid also known as ethanoic acid is the organic acid found in vinegar at concentrations of 4 to 8 percent giving it its characteristic sour taste and pungent smell.

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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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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the atomic number of oxygen?

A 6
B 10
C 8
D 16

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Correct Answer: Option C — 8

Explanation: Oxygen has an atomic number of 8 meaning it has 8 protons in its nucleus and typically 8 electrons in its neutral form with an electronic configuration of 2,6.

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Easy nts Uploaded: 07 Aug 2026

Which element is essential for the formation of hemoglobin?

A Iron
B Copper
C Magnesium
D Zinc

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Correct Answer: Option A — Iron

Explanation: Iron is a crucial component of hemoglobin, the protein in red blood cells responsible for transporting oxygen throughout the body. Iron deficiency can lead to anemia, characterized by fatigue and reduced oxygen delivery.

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Easy nts Uploaded: 07 Aug 2026

What is the common name of the compound H2O2?

A Water
B Hydrogen peroxide
C Hydrogen sulfide
D Hydrochloric acid

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Correct Answer: Option B — Hydrogen peroxide

Explanation: H2O2 is commonly known as hydrogen peroxide, a compound used as a mild antiseptic and bleaching agent. It decomposes into water and oxygen and is a stronger oxidizing agent than water due to its extra oxygen atom.

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Easy fpsc Uploaded: 07 Aug 2026

Which of the following is an example of a physical change?

A Digestion of food
B Rusting of iron
C Burning of wood
D Melting of ice

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Correct Answer: Option D — Melting of ice

Explanation: Melting of ice is a physical change because it involves only a change in the state of matter from solid to liquid without altering its chemical composition. The water molecules remain chemically identical throughout the process.

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Easy nts Uploaded: 07 Aug 2026

Which of the following is an example of an alkali metal?

A Calcium
B Magnesium
C Potassium
D Aluminium

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Correct Answer: Option C — Potassium

Explanation: Potassium belongs to Group 1 of the periodic table, known as alkali metals. These elements are highly reactive, have a single valence electron, and readily form +1 ions in chemical reactions.

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Easy nts Uploaded: 07 Aug 2026

What is the chemical name for table salt?

A Sodium nitrate
B Sodium bicarbonate
C Sodium chloride
D Sodium sulfate

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Correct Answer: Option C — Sodium chloride

Explanation: Table salt is chemically known as sodium chloride, formed by the ionic bond between sodium cations and chloride anions. It is essential for human physiology and widely used as a food preservative and seasoning.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the atomic number of carbon?

A 4
B 6
C 8
D 12

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Correct Answer: Option B — 6

Explanation: Carbon has an atomic number of 6 meaning it has 6 protons in its nucleus and 6 electrons in its neutral state making it the basis of all organic chemistry.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which indicator turns red in acidic solutions and blue in alkaline solutions?

A Litmus
B Universal indicator
C Phenolphthalein
D Methyl orange

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Correct Answer: Option A — Litmus

Explanation: Litmus is a natural pH indicator derived from lichens that turns red in acidic solutions with pH below 7 and blue in alkaline solutions with pH above 7.

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Easy nts Uploaded: 07 Aug 2026

What is the name of the negatively charged subatomic particle?

A Electron
B Nucleon
C Proton
D Neutron

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Correct Answer: Option A — Electron

Explanation: Electrons are negatively charged subatomic particles that orbit the nucleus of an atom in defined energy levels. They are much lighter than protons and neutrons and are responsible for chemical bonding between atoms.

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Easy ppsc nts Uploaded: 14 Jul 2026

What is the lightest element in the periodic table?

A Helium
B Hydrogen
C Lithium
D Beryllium

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Correct Answer: Option B — Hydrogen

Explanation: Hydrogen is the lightest and simplest element in the periodic table with atomic number 1 consisting of one proton and one electron in its most common form.

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Easy nts Uploaded: 06 Aug 2026

Which particle has a negative charge?

A Proton
B Electron
C Neutron
D Positron

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Correct Answer: Option B — Electron

Explanation: Electrons carry a negative charge and orbit the nucleus of an atom. Protons are positively charged while neutrons carry no charge. Electrons determine an atom's chemical bonding behavior and reactivity.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the IUPAC name for the simplest hydrocarbon with formula CH4?

A Ethane
B Butane
C Propane
D Methane

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Correct Answer: Option D — Methane

Explanation: Methane CH4 is the simplest hydrocarbon and the first member of the alkane series where carbon atoms form single bonds and the molecule is saturated.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical name of NaOH?

A Sodium chloride
B Sodium carbonate
C Sodium bicarbonate
D Sodium hydroxide

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Correct Answer: Option D — Sodium hydroxide

Explanation: NaOH is sodium hydroxide also known as caustic soda a strong base used in soap making paper production and as a drain cleaner due to its highly alkaline properties.

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Easy nts Uploaded: 06 Aug 2026

What type of reaction occurs when an acid reacts with a base?

A Neutralization
B Oxidation
C Combustion
D Decomposition

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Correct Answer: Option A — Neutralization

Explanation: A neutralization reaction occurs when an acid reacts with a base to produce salt and water. This reaction typically results in a solution with a pH closer to neutral, depending on the strength of the reactants.

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Easy ppsc Uploaded: 07 Aug 2026

What is the common name for the compound NaCl?

A Baking soda
B Table salt
C Washing soda
D Epsom salt

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Correct Answer: Option B — Table salt

Explanation: Sodium chloride, commonly known as table salt, is an ionic compound essential for human health and widely used as a food seasoning and preservative. It is obtained through mining or evaporation of seawater.

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Easy ppsc nts Uploaded: 14 Jul 2026

What is the chemical symbol for lead?

A Pb
B Ld
C Le
D Li

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Correct Answer: Option A — Pb

Explanation: The chemical symbol for lead is Pb derived from the Latin word Plumbum and lead is a dense heavy metal with atomic number 82 used in batteries and radiation shielding.

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Easy nts Uploaded: 07 Aug 2026

Which of these is a noble gas?

A Argon
B Bromine
C Sulfur
D Chlorine

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Correct Answer: Option A — Argon

Explanation: Argon belongs to Group 18 of the periodic table known as noble gases. These elements have complete outer electron shells, making them chemically inert and unreactive under normal conditions.

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