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।
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।
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.
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Exam Tip
Combustion में chemical reaction होती है और new substances बनते हैं। इसलिए combustibility chemical property है।
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।
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।
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।
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।
