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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 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 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 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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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for ozone, the molecule that forms the protective layer in the stratosphere?

A O
B O2
C O3
D O4

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Correct Answer: Option C — O3

Explanation: Ozone has the chemical formula O3 consisting of three oxygen atoms and forms the stratospheric ozone layer that absorbs harmful UV radiation protecting life on Earth.

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Easy fpsc ppsc nts Uploaded: 05 Aug 2026

What is the IUPAC name for CH3-CH2-OH the simplest alcohol found in beverages?

A Methanol
B Propanol
C Butanol
D Ethanol

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Correct Answer: Option D — Ethanol

Explanation: Ethanol also written as C2H5OH is the simplest alcohol produced by fermentation of sugars and is found in alcoholic beverages used as a solvent and as a biofuel.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which test is used to detect the presence of starch using iodine solution?

A Benedict's test
B Biuret test
C Iodine test
D Flame test

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Correct Answer: Option C — Iodine test

Explanation: The iodine test detects starch by turning iodine solution from yellow-brown to blue-black in the presence of starch due to the triiodide ion fitting within the starch helix.

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