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पदार्थ की अवस्था बदलने पर क्या जरूरी नहीं बदलता?
What does not necessarily change when state of matter changes?
#state change
#physical change
#chemical nature
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A रासायनिक nature / Chemical nature
B shape
C interparticle distance
D particle motion
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Correct Answer
A. रासायनिक nature / Chemical nature
Step 1
Concept
State change is a physical change. Chemical identity need not change.
Step 2
Why this answer is correct
The correct answer is A. रासायनिक nature / Chemical nature. State change is a physical change. Chemical identity need not change.
Step 3
Exam Tip
State change physical change है। इसमें chemical identity जरूरी नहीं बदलती।
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बर्फ के पानी बनने पर chemical composition के बारे में सही कथन क्या है?
What is correct about chemical composition when ice becomes water?
#ice water
#physical change
#composition
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A composition बदलकर oxygen बनती है / Composition changes to oxygen
B composition समान रहती है / Composition remains same
C composition sodium chloride बनती है / Composition becomes sodium chloride
D composition vanish होती है / Composition vanishes
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Correct Answer
B. composition समान रहती है / Composition remains same
Step 1
Concept
Ice and water are different states of the same substance. This is a physical change.
Step 2
Why this answer is correct
The correct answer is B. composition समान रहती है / Composition remains same. Ice and water are different states of the same substance. This is a physical change.
Step 3
Exam Tip
Ice और water दोनों same substance की अलग states हैं। यह physical change है।
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कागज जलना किस प्रकार का परिवर्तन है?
Burning of paper is what type of change?
#burning
#chemical change
#paper
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A रासायनिक परिवर्तन / Chemical change
B भौतिक परिवर्तन / Physical change
C केवल अवस्था परिवर्तन / Only state change
D केवल विसरण / Only diffusion
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Correct Answer
A. रासायनिक परिवर्तन / Chemical change
Step 1
Concept
New substances form when paper burns. Therefore it is a chemical change.
Step 2
Why this answer is correct
The correct answer is A. रासायनिक परिवर्तन / Chemical change. New substances form when paper burns. Therefore it is a chemical change.
Step 3
Exam Tip
कागज जलने पर नए पदार्थ बनते हैं। इसलिए यह chemical change है।
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भौतिक परिवर्तन में सामान्यतः क्या नहीं बदलता?
What generally does not change in a physical change?
#physical change
#chemical identity
#nature of matter
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A रंग always / Color always
B chemical identity
C shape always
D state always
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Correct Answer
B. chemical identity
Step 1
Concept
In physical change shape state or size may change. But chemical identity remains same.
Step 2
Why this answer is correct
The correct answer is B. chemical identity. In physical change shape state or size may change. But chemical identity remains same.
Step 3
Exam Tip
Physical change में shape state या size बदल सकता है। पर chemical identity वही रहती है।
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रासायनिक परिवर्तन की पहचान क्या हो सकती है?
What can be an indication of a chemical change?
#chemical change
#new substance
#examples
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A केवल आकार बदलना / Only change in shape
B केवल position बदलना / Only change in position
C नया पदार्थ बनना / Formation of new substance
D केवल काटना / Only cutting
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Correct Answer
C. नया पदार्थ बनना / Formation of new substance
Step 1
Concept
In a chemical change new substances can form. Examples are burning and rusting.
Step 2
Why this answer is correct
The correct answer is C. नया पदार्थ बनना / Formation of new substance. In a chemical change new substances can form. Examples are burning and rusting.
Step 3
Exam Tip
Chemical change में new substances बन सकते हैं। जैसे जलना या जंग लगना।
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लोहे में जंग लगना किस प्रकार का परिवर्तन है?
Rusting of iron is what type of change?
#rusting
#iron
#chemical change
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A भौतिक परिवर्तन / Physical change
B अवस्था परिवर्तन / State change
C विसरण / Diffusion
D रासायनिक परिवर्तन / Chemical change
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Correct Answer
D. रासायनिक परिवर्तन / Chemical change
Step 1
Concept
During rusting new substances such as iron oxide form. Therefore it is a chemical change.
Step 2
Why this answer is correct
The correct answer is D. रासायनिक परिवर्तन / Chemical change. During rusting new substances such as iron oxide form. Therefore it is a chemical change.
Step 3
Exam Tip
जंग लगने पर iron oxide जैसे नए substances बनते हैं। इसलिए यह chemical change है।
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मोमबत्ती का जलना मुख्यतः किस प्रकार का परिवर्तन है?
Burning of a candle is mainly what type of change?
#candle burning
#chemical change
#wax
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A केवल गलन / Only melting
B रासायनिक परिवर्तन / Chemical change
C केवल ठोस बनना / Only solidification
D केवल diffusion / Only diffusion
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Correct Answer
B. रासायनिक परिवर्तन / Chemical change
Step 1
Concept
In candle burning wax reacts 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. In candle burning wax reacts and new substances form. Therefore it is a chemical change.
Step 3
Exam Tip
Candle burning में wax reacts and new substances form. इसलिए यह chemical change है।
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