Chemistry MCQs for Competitive Exams

MCQS

Chemistry MCQs for Competitive Exams

Practice with answers, explanations, and exam-focused revision notes.

33 MCQs Page 2

Topic Notes: Chemistry

These notes summarize the key preparation context before you attempt the MCQs. Review the topic focus, then practice the questions below with answers and explanations.

Quick Overview

Welcome to the comprehensive Chemistry MCQs preparation hub on MCQsMind. This curated resource is specifically engineered for candidates preparing for Pakistan's competitive examinations, including Central Superior Services (CSS), Provincial Management Services (PMS), Federal Public Service Commission (FPSC), Punjab Public Service Commission (PPSC), Sindh Public Service Commission (SPSC), Khyber Pakhtunkhwa Public Service Commission (KPPSC), Balochistan Public Service Commission (BPSC), National Testing Service (NTS), and university entry tests (MDCAT, ECAT, LAT).

1. High-Yield Focus Areas & Syllabus Coverage

Mastering Chemistry requires a systematic approach to key concepts, historical facts, factual data, and problem-solving methodologies. Our editorial team continuously analyzes past exam papers from 2018 to 2026 to ensure that every subcategory and topic set aligned under this hub reflects current exam trends and board preferences.

  • Core Theoretical Concepts: Fundamental definitions, governing laws, constitutional provisions, and subject-specific terminology required for objective screening tests.
  • Factual & Historical Accuracy: Chronological timelines, dates, geographical data, key personalities, and official statistical metrics frequently tested in One-Paper MCQs exams.
  • Applied & Conceptual Questions: Scenario-based questions designed to evaluate critical thinking, quantitative reasoning, and analytical capability under timed conditions.
  • Solved Past Paper Questions: Authenticated multiple-choice questions extracted from previous FPSC, PPSC, NTS, and PMS papers with verified answer keys and detailed explanations.

2. Exam Pattern & Weightage Analysis

In competitive examinations, Chemistry plays a crucial role in securing high merit scores. For CSS Preliminary Tests (MPT) and PPSC/FPSC General Ability tests, objective MCQs constitute 100% of the total screening score. Understanding the weightage distribution across subtopics allows candidates to prioritize high-frequency subjects and avoid spending excessive time on low-yield areas.

Examination Body Test Format Negative Marking Recommended Time per MCQ
CSS MPT (FPSC) 200 MCQs (Objective) No 60 Seconds
PPSC One-Paper / PMS 100 MCQs (General Ability) Yes (0.25 Marks) 54 Seconds
NTS / ETEA Screening 100 MCQs (Subject + General) Varies by Agency 60 Seconds

3. Strategic Preparation Methodology

To maximize retention and minimize test-day anxiety, we recommend following the Three-Phase Revision Method:

  1. Phase 1 — Topic-Wise Practice: Select a subcategory below and attempt questions in study mode without time constraints. Read the step-by-step explanation for every question you get wrong.
  2. Phase 2 — Timed Self-Assessment: Transition to our Custom Mock Test Hub and generate timed practice quizzes containing 20 to 50 questions from Chemistry. Practice managing your time under 45 seconds per question.
  3. Phase 3 — Weakness Target Drill: Log in to your free account to track incorrect attempts in your personal Mistake Bank. Periodically re-attempt failed questions until achieving 100% accuracy.

4. Quality & Fact-Verification Assurance

All content within this Chemistry section is reviewed against standard reference works (including Oxford, Cambridge, and Board textbooks) and official past papers. If you spot an ambiguous question or outdated answer key, use the inline report feature under the question card to alert our editorial team for review within 48 hours.

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11
How many extrema (maxima and minima) does the harmonic oscillator wavefunction ψ(x) = Nx * exp(-ax^2/2) possess?
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12
An electron of mass m is confined to a one-dimensional box of length b. If it makes a radiative transition from second excited state to the ground state/the frequency of the photon emitted is
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13
First order perturbation correction $$\Delta \varepsilon _n^{\left( 1 \right)}$$ to energy level $${\varepsilon _n}$$ of a simple harmonic oscillator due to the anharmonicity perturbation $$\gamma {x^3}$$ is given by
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14
Calculate the zero-point vibrational energy of a 35Cl2 molecule, modeled as a harmonic oscillator with a force constant k = 2293.8 N/m.
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15
Which of the following pairs of operators commute?
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16
Three quantum number have been derived from equation of____________________?
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17
Why does an electrochemical cell eventually cease to function?
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18
Which enzyme is responsible for the fermentation of glucose into ethyl alcohol?
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19
Which enzyme is employed to digest gelatin for the purpose of silver recovery from photographic films?
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20
When plotting 1/T on the X-axis and log k on the Y-axis, a straight line with a negative slope is obtained. The line extends into which two quadrants?
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