A. ऐसा गुण जिसे chemical composition बदले बिना देखा या मापा जा सके/A property observed or measured without changing chemical composition
Step 1
Concept
In a physical property identity of substance does not change. Color density melting point are examples.
Step 2
Why this answer is correct
The correct answer is A. ऐसा गुण जिसे chemical composition बदले बिना देखा या मापा जा सके / A property observed or measured without changing chemical composition. In a physical property identity of substance does not change. Color density melting point are examples.
Step 3
Exam Tip
Physical property में substance की identity नहीं बदलती। रंग density melting point इसके examples हैं।
B. नया पदार्थ बनाने की क्षमता से/Ability to form new substance
Step 1
Concept
Chemical property tells reactivity of a substance. Examples are burning or rusting.
Step 2
Why this answer is correct
The correct answer is B. नया पदार्थ बनाने की क्षमता से / Ability to form new substance. Chemical property tells reactivity of a substance. Examples are burning or rusting.
Step 3
Exam Tip
Chemical property substance की reactivity बताती है। जैसे जलना या जंग लगना।
Observing color does not change chemical composition of substance. Therefore it is a physical property.
Step 2
Why this answer is correct
The correct answer is A. भौतिक गुण / Physical property. Observing color does not change chemical composition of substance. Therefore it is a physical property.
Step 3
Exam Tip
रंग देखने में substance की chemical composition नहीं बदलती। इसलिए यह physical property है।
In rusting iron changes into a new substance. Therefore rusting tendency is a chemical property.
Step 2
Why this answer is correct
The correct answer is B. रासायनिक गुण / Chemical property. In rusting iron changes into a new substance. Therefore rusting tendency is a chemical property.
Step 3
Exam Tip
Rusting में iron नए पदार्थ में बदलता है। इसलिए rusting tendency chemical property है।
Melting point is measured without changing chemical composition. Therefore it is a physical property.
Step 2
Why this answer is correct
The correct answer is C. भौतिक गुण / Physical property. Melting point is measured without changing chemical composition. Therefore it is a physical property.
Step 3
Exam Tip
Melting point बिना chemical composition बदले मापा जाता है। इसलिए यह physical property है।
Boiling point is a physical property related to state change. It can help in substance identification.
Step 2
Why this answer is correct
The correct answer is D. भौतिक property / Physical property. Boiling point is a physical property related to state change. It can help in substance identification.
Step 3
Exam Tip
Boiling point state change से जुड़ा physical property है। यह substance identification में helpful हो सकता है।
Combustion involves chemical reaction and forms new substances. Therefore combustibility is a chemical property.
Step 2
Why this answer is correct
The correct answer is A. रासायनिक property / Chemical property. Combustion involves chemical reaction and forms new substances. Therefore combustibility is a chemical property.
Step 3
Exam Tip
Combustion में chemical reaction होती है और new substances बनते हैं। इसलिए combustibility chemical property है।
D. जो amount पर depend न करे/Does not depend on amount
Step 1
Concept
Intensive property does not depend on amount of sample. Examples are density and melting point.
Step 2
Why this answer is correct
The correct answer is D. जो amount पर depend न करे / Does not depend on amount. Intensive property does not depend on amount of sample. Examples are density and melting point.
Step 3
Exam Tip
Intensive property sample की मात्रा पर निर्भर नहीं करती। जैसे density और melting point।
D. क्योंकि यह sample की मात्रा पर depend करता है/Because it depends on amount of sample
Step 1
Concept
When sample increases volume can also increase. Therefore volume is an extensive property.
Step 2
Why this answer is correct
The correct answer is D. क्योंकि यह sample की मात्रा पर depend करता है / Because it depends on amount of sample. When sample increases volume can also increase. Therefore volume is an extensive property.
Step 3
Exam Tip
Sample बढ़ाने पर volume भी बढ़ सकता है। इसलिए volume extensive property है।
A. क्योंकि यह sample की मात्रा पर निर्भर नहीं करती/Because it does not depend on amount of sample
Step 1
Concept
Density can be a characteristic property of a substance. For the same substance density generally does not change with quantity.
Step 2
Why this answer is correct
The correct answer is A. क्योंकि यह sample की मात्रा पर निर्भर नहीं करती / Because it does not depend on amount of sample. Density can be a characteristic property of a substance. For the same substance density generally does not change with quantity.
Step 3
Exam Tip
Density substance की characteristic property हो सकती है। समान पदार्थ की quantity बदलने पर density सामान्यतः नहीं बदलती।
Chemical property tells reaction behavior of a substance. Examples are reaction with acids or burning.
Step 2
Why this answer is correct
The correct answer is C. रासायनिक property / Chemical property. Chemical property tells reaction behavior of a substance. Examples are reaction with acids or burning.
Step 3
Exam Tip
Chemical property substance के reaction behavior को बताती है। जैसे acids से reaction या burning।
In shape change chemical identity of substance does not change. Therefore it is physical change.
Step 2
Why this answer is correct
The correct answer is D. भौतिक परिवर्तन / Physical change. In shape change chemical identity of substance does not change. Therefore it is physical change.
Step 3
Exam Tip
Shape change में substance की chemical identity नहीं बदलती। इसलिए यह physical change है।
Chemical changes occur when milk turns sour and new substances form. Therefore it is a chemical change.
Step 2
Why this answer is correct
The correct answer is B. रासायनिक परिवर्तन / Chemical change. Chemical changes occur when milk turns sour and new substances form. Therefore it is a chemical change.
Step 3
Exam Tip
दूध खट्टा होने पर chemical changes होते हैं और new substances बनते हैं। इसलिए यह chemical change है।
Chemical changes occur during ripening. Therefore fruit ripening is considered a chemical change.
Step 2
Why this answer is correct
The correct answer is C. रासायनिक परिवर्तन / Chemical change. Chemical changes occur during ripening. Therefore fruit ripening is considered a chemical change.
Step 3
Exam Tip
Ripening में chemical changes होते हैं। इसलिए fruit ripening chemical change माना जाता है।
Sugar dissolution can be a reversible physical process. Sugar can be recovered by evaporation.
Step 2
Why this answer is correct
The correct answer is D. physical change and separation. Sugar dissolution can be a reversible physical process. Sugar can be recovered by evaporation.
Step 3
Exam Tip
Sugar dissolution reversible physical process हो सकता है। Evaporation से sugar recover की जा सकती है।
In burning a substance reacts with oxygen to form new products. Therefore it is a chemical change.
Step 2
Why this answer is correct
The correct answer is A. नए पदार्थ बनते हैं / New substances are formed. In burning a substance reacts with oxygen to form new products. Therefore it is a chemical change.
Step 3
Exam Tip
Burning में substance oxygen से react कर new products बनाता है। इसलिए यह chemical change है।
B. chemical composition नहीं बदलती/Chemical composition does not change
Step 1
Concept
In melting solid becomes liquid but identity of substance remains same. Therefore it is physical change.
Step 2
Why this answer is correct
The correct answer is B. chemical composition नहीं बदलती / Chemical composition does not change. In melting solid becomes liquid but identity of substance remains same. Therefore it is physical change.
Step 3
Exam Tip
Melting में solid liquid बनता है पर substance की identity same रहती है। इसलिए यह physical change है।
C. बर्फ का पिघलना और फिर जमना/Melting of ice and freezing again
Step 1
Concept
Ice melts into water and can freeze again. Therefore it is a reversible physical change.
Step 2
Why this answer is correct
The correct answer is C. बर्फ का पिघलना और फिर जमना / Melting of ice and freezing again. Ice melts into water and can freeze again. Therefore it is a reversible physical change.
Step 3
Exam Tip
Ice melt होकर water बनता है और फिर freeze हो सकता है। इसलिए यह reversible physical change है।
When wood burns new substances form and original wood is not easily recovered. It is an irreversible chemical change.
Step 2
Why this answer is correct
The correct answer is D. लकड़ी का जलना / Burning of wood. When wood burns new substances form and original wood is not easily recovered. It is an irreversible chemical change.
Step 3
Exam Tip
लकड़ी जलने पर new substances बनते हैं और original wood वापस पाना आसान नहीं। यह irreversible chemical change है।
A. पदार्थ छोटे कणों से बना है/Matter is made of tiny particles
Step 1
Concept
Particulate nature tells that matter is made of particles. It explains diffusion and state properties.
Step 2
Why this answer is correct
The correct answer is A. पदार्थ छोटे कणों से बना है / Matter is made of tiny particles. Particulate nature tells that matter is made of particles. It explains diffusion and state properties.
Step 3
Exam Tip
Particulate nature बताती है कि matter particles से बना है। इससे diffusion और state properties समझती हैं।
A. चीनी पानी में घुलकर volume में बहुत अधिक वृद्धि नहीं करती/Sugar dissolves in water without very large volume increase
Step 1
Concept
Sugar particles can fit into spaces between water particles. This gives idea of interparticle space.
Step 2
Why this answer is correct
The correct answer is A. चीनी पानी में घुलकर volume में बहुत अधिक वृद्धि नहीं करती / Sugar dissolves in water without very large volume increase. Sugar particles can fit into spaces between water particles. This gives idea of interparticle space.
Step 3
Exam Tip
Sugar particles water particles के spaces में fit हो सकते हैं। इससे interparticle space का idea मिलता है।
A. particles की random motion से/Random motion of particles
Step 1
Concept
Brownian motion shows random motion of tiny particles. It supports particulate nature.
Step 2
Why this answer is correct
The correct answer is A. particles की random motion से / Random motion of particles. Brownian motion shows random motion of tiny particles. It supports particulate nature.
Step 3
Exam Tip
Brownian motion tiny particles की random motion दिखाता है। यह particulate nature को support करता है।
Diffusion is evidence of continuous motion of particles. It is easily seen in gases and liquids.
Step 2
Why this answer is correct
The correct answer is A. particles move करते हैं / Particles move. Diffusion is evidence of continuous motion of particles. It is easily seen in gases and liquids.
Step 3
Exam Tip
Diffusion particles की continuous motion का evidence है। Gases और liquids में यह आसानी से दिखता है।
When attraction is strong particles remain close. This affects state and physical properties.
Step 2
Why this answer is correct
The correct answer is A. state और shape पर / State and shape. When attraction is strong particles remain close. This affects state and physical properties.
Step 3
Exam Tip
Attraction अधिक होने पर particles close रहते हैं। इससे state और physical properties प्रभावित होती हैं।
A. gas highly compressible होती है/Gas is highly compressible
Step 1
Concept
Gas has large empty space between particles. Therefore gas is compressible.
Step 2
Why this answer is correct
The correct answer is A. gas highly compressible होती है / Gas is highly compressible. Gas has large empty space between particles. Therefore gas is compressible.
Step 3
Exam Tip
Gas में कणों के बीच खाली स्थान अधिक होता है। इसलिए gas compressible होती है।
A. liquid fixed volume रखता है पर fixed shape नहीं/Liquid has fixed volume but not fixed shape
Step 1
Concept
Liquid takes the shape of container. But its volume generally remains definite.
Step 2
Why this answer is correct
The correct answer is A. liquid fixed volume रखता है पर fixed shape नहीं / Liquid has fixed volume but not fixed shape. Liquid takes the shape of container. But its volume generally remains definite.
Step 3
Exam Tip
Liquid container का shape लेता है। पर उसका volume generally definite रहता है।
A. solid का definite shape और definite volume होता है/Solid has definite shape and definite volume
Step 1
Concept
In solid particles are close and strongly attracted. Therefore shape and volume remain definite.
Step 2
Why this answer is correct
The correct answer is A. solid का definite shape और definite volume होता है / Solid has definite shape and definite volume. In solid particles are close and strongly attracted. Therefore shape and volume remain definite.
Step 3
Exam Tip
Solid में particles close और strongly attracted होते हैं। इसलिए shape और volume definite रहते हैं।
A. यह states diffusion और compression explain करता है/It explains states diffusion and compression
Step 1
Concept
Particle model gives microscopic picture of matter. It explains many physical properties.
Step 2
Why this answer is correct
The correct answer is A. यह states diffusion और compression explain करता है / It explains states diffusion and compression. Particle model gives microscopic picture of matter. It explains many physical properties.
Step 3
Exam Tip
Particle model matter की microscopic picture देता है। इससे many physical properties explain होती हैं।
Ice water and steam are different states of the same substance. Chemical composition remains same.
Step 2
Why this answer is correct
The correct answer is A. बर्फ पानी और भाप / Ice water and steam. Ice water and steam are different states of the same substance. Chemical composition remains same.
Step 3
Exam Tip
Ice water and steam same substance की different states हैं। Chemical composition same रहती है।
A. chemical identity generally same रहती है/Chemical identity generally remains same
Step 1
Concept
In state change only physical form changes. Chemical composition of substance can remain same.
Step 2
Why this answer is correct
The correct answer is A. chemical identity generally same रहती है / Chemical identity generally remains same. In state change only physical form changes. Chemical composition of substance can remain same.
Step 3
Exam Tip
State change में only physical form बदलता है। Substance की chemical composition same रह सकती है।
A. properties changes particle model और examples को साथ याद रखें/Remember properties changes particle model and examples together
Step 1
Concept
In Nature of matter physical chemical properties and changes are asked. Identification becomes easy through examples.
Step 2
Why this answer is correct
The correct answer is A. properties changes particle model और examples को साथ याद रखें / Remember properties changes particle model and examples together. In Nature of matter physical chemical properties and changes are asked. Identification becomes easy through examples.
Step 3
Exam Tip
Nature of matter में physical chemical properties और changes पूछे जाते हैं। Examples से पहचान आसान होती है।
A. matter mass और space रखता है particles से बना है और state तथा composition से classify होता है/Matter has mass and space is made of particles and is classified by state and composition
Step 1
Concept
Definition states classification properties and changes of matter are the basic foundation. In exams classify through examples.
Step 2
Why this answer is correct
The correct answer is A. matter mass और space रखता है particles से बना है और state तथा composition से classify होता है / Matter has mass and space is made of particles and is classified by state and composition. Definition states classification properties and changes of matter are the basic foundation. In exams classify through examples.
Step 3
Exam Tip
पदार्थ की definition states classification properties और changes basic foundation हैं। Exam में examples से classification करें।
