کیمیائی تبدیلی کو _____ کہا جاتا ہے؟
A. Phase Transition
B. Chemical Reaction
C. Physical Change
D. Chemical Interaction
Explanation
A chemical reaction is a process in which one or more substances are converted into new substances, often with a change in chemical composition and properties. Chemical reactions involve the breaking and forming of chemical bonds, resulting in a transformation of the original substances.
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لکڑی جلانا ایک ______ تبدیلی ہے۔
A. Temporary
B. Chemical
C. Physical
D. Both A and B
Explanation
Burning of wood is a chemical change , as it involves a chemical reaction between the wood and oxygen. Resulting in a change in chemical composition and the formation of new substances (ashes, carbon dioxide, water vapor, etc).
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مندرجہ ذیل میں سے کون سی کیمیائی تبدیلی نہیں ہے؟
A. Explosion of firework
B. Cooking raw food
C. Burning of fuel
D. Melting of ice
Explanation
Melting of ice is a physical change , as it only involves a change in state (from solid to liquid) without a change in chemical composition. The examples of chemical changes:
Burning of fuel Explosion of firework Burning of wood Cooking of food (breakfast, lunch, dinner) Bursting of crackers Burning of wax Rusting of iron Heating sulphur with iron fillings (to produce iron sulphide) Digestion of food Respiration in living things Photosynthesis in plants
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ایک تبدیلی جو کسی مادّے کی ساخت کو بدل دیتی ہے ____ کے نام سے جانا جاتا ہے؟
A. Chemical Change
B. Physical Change
C. Biological Change
D. Nuclear Change
Explanation
A chemical change , also known as a chemical reaction. It is a process that alters the composition of one or more substances, resulting in the formation of new substances with different properties.
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مندرجہ ذیل میں سے کون سی کیمیائی تبدیلی کی علامت نہیں ہے؟
A. Production of a new material
B. Change in colour, temperature, smell
C. No change in composition
D. A release of gas
Explanation
The correct answer is: No change in composition
A chemical change involves a transformation of one or more substances into new substances, which means a change in composition. The signs of chemical change :
Release of gas Change in color Change in temperature Change in smell Production of a new material
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