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Political Science NCERT Solutions Class 9 Science Chapter 2 – Is Matter Around Us Pure?
Class 9 Science
Last Updated: 15 April 2026
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हिंदी में (Hindi)
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Important Points
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Practice MCQ Questions (27 questions)
Q1. Which of the following is an example of a solution?
✓ Correct Answer: A
Q2. In a solution, what is the component called that is present in the larger amount?
✓ Correct Answer: B
Q3. What type of mixture is air?
✓ Correct Answer: A
Q4. What is the size of particles in a solution?
✓ Correct Answer: C
Q5. What is the property of a suspension?
✓ Correct Answer: A
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Frequently Asked Questions (FAQ)
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Tough Words (Glossary)
Adulteration
Meaning: The act of making something impure by adding inferior substances
अर्थ: मिलावट
"The milk was rejected due to adulteration."
Constituent
Meaning: A part or component of something
अर्थ: घटक
"Water is a constituent of milk."
Homogeneous
Meaning: Of the same kind; uniform in composition
अर्थ: सजातीय
"Salt water is a homogeneous mixture."
Heterogeneous
Meaning: Not uniform; consisting of different parts
अर्थ: विजातीय
"Oil and water form a heterogeneous mixture."
Solvent
Meaning: A substance that dissolves another substance
अर्थ: विलायक
"Water is a universal solvent."
Solute
Meaning: A substance that is dissolved in a solvent
अर्थ: विलेय
"Salt is the solute in saltwater."
Solution
Meaning: A homogeneous mixture of solute and solvent
अर्थ: विलयन
"Lemonade is a solution of lemon juice, sugar and water."
Suspension
Meaning: A heterogeneous mixture where particles settle on standing
अर्थ: निलंबन
"Chalk powder in water is a suspension."
Colloid
Meaning: A heterogeneous mixture with particles too small to settle
अर्थ: कोलॉइड
"Milk is a colloid."
Tyndall Effect
Meaning: Scattering of light by colloidal particles
अर्थ: टिंडल प्रभाव
"The Tyndall effect is seen in fog."
Concentration
Meaning: The amount of solute dissolved in a solvent
अर्थ: सांद्रता
"The concentration of sugar affects the taste."
Dilute
Meaning: Containing a small amount of solute
अर्थ: सांद्रहीन
"Lemonade can be dilute or concentrated."
Concentrated
Meaning: Containing a large amount of solute
अर्थ: सांद्र
"This is a concentrated acid solution."
Saturated Solution
Meaning: A solution that cannot dissolve more solute
अर्थ: संतृप्त विलयन
"Salt water can become a saturated solution."
Unsaturated Solution
Meaning: A solution that can still dissolve more solute
अर्थ: असंतृप्त विलयन
"Sugar solution is unsaturated if more sugar can be dissolved."
Solubility
Meaning: The ability of a substance to dissolve
अर्थ: विलेयता
"The solubility of salt in water is high."
Filtration
Meaning: The process of separating solids from liquids using a filter
अर्थ: निस्यंदन
"We used filtration to separate sand from water."
Centrifugation
Meaning: A process to separate colloidal particles using a spinning force
अर्थ: अपकेंद्रण
"Centrifugation is used in separating cream from milk."
Element
Meaning: A pure substance made of only one type of atom
अर्थ: तत्व
"Gold is a chemical element."
Compound
Meaning: A substance formed when two or more elements combine chemically
अर्थ: यौगिक
"Water is a compound of hydrogen and oxygen."
Metal
Meaning: An element that conducts heat and electricity
अर्थ: धातु
"Iron is a useful metal."
Non-metal
Meaning: An element that is not metallic in nature
अर्थ: अधातु
"Oxygen is a non-metal."
Metalloid
Meaning: An element with properties of both metals and non-metals
अर्थ: उपधातु
"Silicon is a metalloid."
Alloy
Meaning: A mixture of metals or a metal and another element
अर्थ: मिश्रधातु
"Bronze is an alloy of copper and tin."
Evaporation
Meaning: The process of a liquid changing into vapour
अर्थ: वाष्पीकरण
"Water evaporates in the sun."
Condensation
Meaning: The process of vapour changing into liquid
अर्थ: संघनन
"Water droplets form by condensation."
Sublimation
Meaning: The change of solid directly into gas
अर्थ: उर्ध्वपातन
"Naphthalene balls undergo sublimation."
Deposition
Meaning: The change of gas directly into solid
अर्थ: अवक्षेपण
"Frost forms by deposition of water vapour."
Latent Heat
Meaning: The hidden heat absorbed or released during a change of state
अर्थ: गुप्त ऊष्मा
"Ice absorbs latent heat while melting."
Fusion
Meaning: The process of melting from solid to liquid
अर्थ: गलन
"Ice fusion happens at 0°C."
Vaporisation
Meaning: The process of liquid changing to vapour
अर्थ: वाष्पीकरण
"Boiling is a type of vaporisation."
Boiling Point
Meaning: The temperature at which a liquid boils
अर्थ: क्वथनांक
"The boiling point of water is 100°C."
Melting Point
Meaning: The temperature at which a solid melts
अर्थ: गलनांक
"The melting point of ice is 0°C."
Rigidity
Meaning: The ability of solids to resist shape change
अर्थ: कठोरता
"Iron shows rigidity."
Compressibility
Meaning: The ability of matter to decrease in volume under pressure
अर्थ: संकुचनशीलता
"Gases have high compressibility."
Diffusion
Meaning: The mixing of particles from high to low concentration
अर्थ: प्रसरण
"Perfume spreads by diffusion."
Kinetic Energy
Meaning: Energy due to motion
अर्थ: गतिज ऊर्जा
"Moving cars have kinetic energy."
Density
Meaning: Mass per unit volume of a substance
अर्थ: घनत्व
"Iron has high density."
Volume
Meaning: The space occupied by a substance
अर्थ: आयतन
"The volume of this bottle is 1 litre."
Mass
Meaning: The amount of matter in a substance
अर्थ: द्रव्यमान
"The mass of the object is 2 kg."
Particle
Meaning: A very small portion of matter
अर्थ: कण
"Air is made up of tiny particles."
Mixture
Meaning: A material made by mixing substances together
अर्थ: मिश्रण
"Soil is a mixture of minerals and organic matter."
Matter
Meaning: Anything that has mass and occupies space
अर्थ: पदार्थ
"Water is matter."
Properties
Meaning: Qualities or characteristics of a substance
अर्थ: गुणधर्म
"The properties of metals include conductivity."
Odour
Meaning: A smell, especially unpleasant
अर्थ: गंध
"The odour of rotten eggs is strong."
Inflammability
Meaning: The ability of a substance to catch fire
अर्थ: ज्वलनशीलता
"Petrol has high inflammability."
Reaction
Meaning: A chemical change producing new substances
अर्थ: प्रतिक्रिया
"Rusting is a chemical reaction."
Extinguish
Meaning: To put out a fire
अर्थ: बुझाना
"Water is used to extinguish fire."
Lustre
Meaning: A gentle sheen or glow
अर्थ: चमक
"Gold has a bright lustre."
Sonorous
Meaning: Producing a deep or ringing sound
अर्थ: गंभीर ध्वन्यात्मक
"The bell is sonorous."