Chemistry MCQs - Everyday Science Practice | PakExamPoint

Practise Chemistry MCQs in Everyday Science. Attempt multiple-choice questions, check answers and revise related subtopics.

Chemistry MCQs and revision practice

Study Chemistry through multiple-choice questions in Everyday Science. This subtopic contains 2834 practice questions. Read the wording carefully, compare the options and attempt an answer before checking the solution in learning mode.

Use these Chemistry MCQs to identify the facts, rules or methods you need to revise. Where an explanation is available, work through it and write down why your chosen option was correct or incorrect. Revisit difficult questions after reviewing your notes, then use exam mode for timed practice.

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Chemistry: questions and answer review

Try each question before opening its answer. Record the concept behind each mistake and revisit it during your next practice session.

1. Esterification is a chemical reaction that occurs between?

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Answer: Alcohol + Carboxylic acid

Explanation Esterification is a chemical reaction that typically occurs between a carboxylic acid and an alcohol Products: An ester (RCOOR) and water (H₂O). Catalyst: An acid catalyst, like sulfuric acid (H₂SO₄). Example: The reaction of acetic acid (CH₃COOH) with ethanol (CH₃CH₂O H) produces ethyl acetate (CH₃COOCH₂CH₃) and water.

2. The value of absolute zero is Celsius?

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Answer: -273 C

Explanation Definition: Absolute zero is the temperature at which a system has the minimum possible energy and all thermal motion of particles ceases. On the Celsius Scale: This point corresponds to -273.15 degrees Celsius. On the Kelvin Scale: The Kelvin scale is an absolute scale where absolute zero is set as 0 K.

3. One mole of an organic compound is completely burnt in oxygen. Which compound produces exactly three moles of water?

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Answer: Ethanol (2H5OH)

Explanation Ethanol (C₂H₅OH) C₂H₅OH + 3 O₂ → 2 CO₂ + 3 H₂O → 3 moles of H₂O

4. Half-life period of the first order reaction depends upon _____?

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Answer: Temperature

Explanation For a first-order reaction , half-life (t₁/₂ = 0.693/k) is independent of initial concentration. It only changes with temperature , as temperature affects the rate constant (k).

5. Coal gas mainly consist of ______?

کوئلے کی گیس بنیادی طور پر ______ پر مشتمل ہے؟

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Answer: Methane and hydrogen

Explanation Coal gas primarily consists of methane (CH₄) and hydrogen (H₂) , along with small amounts of other gases. It is produced during the destructive distillation of coal , where methane and hydrogen are key components.

6. The most abundant component in Earth's atmosphere (or Air) is?

زمین کے ماحول (یا ہوا) میں سب سے زیادہ پرچر جز ہے؟

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Answer: Nitrogen

Explanation An abundant component in Earth's atmosphere is nitrogen , about 78% of the air. The second most abundant gas is oxygen , which makes up about 21% of the air. Hydrogen and carbon dioxide are both present in the air, but in much smaller amounts than nitrogen and oxygen. Last updated by NA on 23-April-2026

7. In 1774 Oxygen was discovered by?

سترہ سو چوہتر میں آکسیجن کس نے دریافت کی تھی؟

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Answer: Priestly

Explanation Oxygen was discovered in 1774 by English chemist Joseph Priestley, He isolated it by heating mercuric oxide and called i t "dephlogisticated air". Oxygen was discovered independently by Carl Wilhelm Scheele (around 1772)

8. Which substance can act as Arrhenius base in an aqueous solution?

پانی کے حل میں کون سا مادہ ارینیس بیس کے طور پر کام کرسکتا ہے؟

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Answer: LiOH

Explanation An Arrhenius base increases OH⁻ concentration in an aqueous solution. LiOH dissociates in water to release OH⁻ ions, making it a strong base.

9. Values of Charle's law constant A depends upon?

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Answer: All of these

Explanation The constant (often represented as 'k' or 'A' ) in Charles's Law is dependent on the amount of gas (number of moles) and the pressure. It essentially represents the proportionality between volume and temperature when pressure is kept constant.

10. Ascorbic Acid is found in ______?

ایسکوربک ایسڈ ______ میں پایا جاتا ہے؟

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Answer: Alma and Citrus Fruits

Explanation Ascorbic acid , also known as Vitamin C , is found in various fruits and vegetables. But Alma (Emblica officinalis) and citrus fruits like oranges, lemons, and grapefruits are particularly rich in it.

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