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Green International University12 سوالات

Chemistry MCQs

Practice Chemistry multiple-choice questions for Green International University 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.

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To increase the pH level
To act as a preservative
To reduce surface tension and emulsify oil and water
To provide fragrance
وضاحتSurfactants have hydrophilic and hydrophobic ends, allowing them to lift oil and dirt from the skin so they can be rinsed away with water.
Glycerin
Mineral oil
Silicone
Stearic acid
وضاحتHumectants like glycerin attract moisture from the atmosphere or deep in the dermis to the surface of the skin to improve hydration.
Oxidation
Neutralization
Polymerization
Hydrolysis
وضاحتA neutralization reaction occurs when an acid and a base react to form water and a salt.
Petrolatum
Polysorbate
Beeswax
Mineral Oil
وضاحتPolysorbates are common non-ionic surfactants used to stabilize oil-in-water emulsions in cosmetics.
Acidic
Neutral
Alkaline
Distilled
وضاحتThe pH scale ranges from 0-14, where values above 7 are considered alkaline (basic).
To increase pH levels
To improve product stability by neutralizing metal ions
To act as a physical exfoliant
To serve as a primary moisturizer
وضاحتChelating agents bond with metal ions that might otherwise cause product degradation or rancidity.
Attracting water to the skin
Softening and smoothing the skin's surface
Increasing the acidity of the skin
Removing dead skin cells chemically
وضاحتEmollients fill in the gaps between dead skin cells, creating a smoother appearance and feel.
Ionic bond
Covalent bond
Hydrogen bond
Metallic bond
وضاحتHydrogen bonding is a weak attraction between a slightly positive hydrogen atom and a slightly negative atom, vital for hydration.
The substance being dissolved
The substance that dissolves the solute
A mixture of two immiscible liquids
A solid precipitate
وضاحتIn a solution, the solvent is the component present in the largest amount that dissolves the solute.
Phenoxyethanol
Isopropyl alcohol
Magnesium sulfate
Talc
وضاحتPhenoxyethanol is a widely used broad-spectrum preservative in personal care products.
To accelerate reaction time
To change the product color
To maintain the pH level of the product
To increase the viscosity
وضاحتBuffers prevent drastic shifts in pH, ensuring the product remains effective and safe for the skin.
Solid particles distributed throughout a liquid
Two liquids that are permanently mixed
Gas dissolved in a solid
A clear, uniform liquid mixture
وضاحتA suspension is a heterogeneous mixture where solid particles are large enough to settle over time.

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 Green International University 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.

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