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NTA13 Questions
Chemistry MCQs
Practice Chemistry multiple-choice questions for 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.
Oxygen
Fluorine
Nitrogen
Chlorine
ExplanationFluorine is the most electronegative element in the periodic table due to its small size and high effective nuclear charge.
sp
sp2
sp3
dsp2
ExplanationMethane consists of one carbon atom bonded to four hydrogen atoms, resulting in four sigma bonds and sp3 hybridization.
Fluorine
Chlorine
Bromine
Iodine
ExplanationElectronegativity increases across a period and decreases down a group; Fluorine is the most electronegative element.
Linear
Trigonal planar
Tetrahedral
Octahedral
ExplanationIn methane, the carbon atom is sp³ hybridized, which leads to a tetrahedral geometry with 109.5-degree angles.
pH = 7
pH > 7
pH < 7
pH = 14
ExplanationA pH less than 7 indicates an acidic solution, with lower values indicating higher acidity.
1s² 2s² 2p⁶ 3s²
1s² 2s² 2p⁶ 3s¹
1s² 2s² 2p⁶ 3s² 3p¹
1s² 2s² 2p⁵ 3s²
ExplanationMagnesium has 12 electrons, filling the shells as 1s2, 2s2, 2p6, and 3s2.
Charles's Law
Boyle's Law
Avogadro's Law
Dalton's Law
ExplanationBoyle's law defines the pressure-volume relationship: P1V1 = P2V2 at constant temperature.
Lithium
Sodium
Potassium
Rubidium
ExplanationAs you move down a group in the periodic table, the number of electron shells increases, increasing the atomic radius.
2 moles
3 moles
4 moles
5 moles
ExplanationThe reaction is CH4 + 2O2 -> CO2 + 2H2O. For 1 mole of methane, 2 moles of O2 are needed, so for 2 moles, 4 are required.
H2O
CO2
NH3
CH4
ExplanationCarbon dioxide has an sp hybridized carbon atom, resulting in a bond angle of 180 degrees and a linear structure.
Formic acid
Acetic acid
Propionic acid
Butyric acid
ExplanationCH3COOH is the chemical formula for acetic acid, commonly known as vinegar in dilute form.
Protons only
Electrons and protons
Protons and neutrons
Neutrons only
ExplanationAtomic mass is the sum of the number of protons and neutrons in the nucleus.
4
6
8
12
ExplanationIn a sodium chloride (NaCl) rock-salt structure, each Na+ ion is surrounded by 6 Cl- ions.
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 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.