Chemical Processes | MCQs
A. None
B. Decomposition Reaction
C. Combination Reaction
D. Neutralization Reaction
Explanation
The given reaction, CaO + CO2 → CaCO2 , is an example of a Combination Reaction, also known as a Synthesis Reaction or Addition Reaction. In this reaction, two substances , calcium oxide (CaO) and carbon dioxide (CO2), combine to form a single compound, calcium carbonate (CaCO2).
Show/Hide Explanation
مندرجہ ذیل میں سے کون سی کیمیائی رد عمل کی مثال ہے؟
A. Water freezing into ice
B. Leaves changing colors in the fall
C. Sand settling to the bottom of a pool
D. A rock rolling down a hill
Explanation
Leaves changing colors in the fall is an example of a chemical reaction. During this process , the production of chlorophyll (the green pigment) slows down, and the production of other pigments.Like carotenoids and anthocyanins increases, causing the leaves to change color.
Show/Hide Explanation
کیمیائی رد عمل کے بارے میں کون سا بیان غلط ہے؟
A. Chemical reactions may be fast, moderate or slow
B. States of matter does not change during chemical reactions
C. Chemical reactions occur with the absorption or emission of energy
D. Chemical reactions produce new substances
Explanation
The incorrect statement is : States of matter does not change during chemical reactions.During chemical reactions , states of matter can change. For example, a solid may dissolve in a liquid , a liquid may vaporize, or a gas may condense into a liquid.
Show/Hide Explanation
کون سا بہترین اشارہ ہے کہ کیمیائی رد عمل ہوا ہے؟
A. None
B. Metal budding when placed in an unknown liquid
C. A white substance dissolving in water
D. Blue powder turns water blue
Explanation
When a metal bubbles when placed in an unknown liquid , it indicates that a chemical reaction has taken place. Bubbling is often a result of a gas being released during a reaction. In this case, the metal is reacting with the unknown liquid to produce gas, causing the bubbling effect. This is a clear indication that a chemical reaction has occurred.
Show/Hide Explanation
محلول سے ٹھوس مادوں کو واپس حاصل کرنے کے لیے کون سا عمل استعمال ہوتا ہے؟
A. Filtration
B. Crystallization
C. Distillation
D. Sublimation
Explanation
Crystallization is the process of obtaining a solid substance from a solution by allowing the solution to cool and form crystals. This process is used to purify substances and obtain a solid in a pure form.
Show/Hide Explanation
ٹھوس مادے کو بخارات بنانے اور بخارات کو گاڑھا کرکے ٹھوس کو براہ راست بنانے کے عمل کو کیا کہا جاتا ہے؟
A. Filtration
B. Sublimation
C. Distillation
D. Crystallization
Explanation
Sublimation is the process by which a solid substance transitions directly into a gas or vapour , without going through the liquid phase, and then condenses back into a solid. Examples include iodine, dry ice, and naphthalene.
Show/Hide Explanation
ٹھوس کو صاف کرنے کے لیے کون سا عمل استعمال ہوتا ہے؟
A. Crystallization
B. Distillation
C. Sublimation
D. Filtration
Explanation
Sublimation process is used for purifying a solid. Sublimation is the process where a solid changes directly into a gas without passing through the liquid state.
Show/Hide Explanation
وہ عمل جس میں مائع کو پاک کیا جاتا ہے _____ کہلاتا ہے؟
A. Filtration
B. Sublimation
C. Distillation
D. Crystallization
Explanation
Distillation is a process that involves boiling a liquid and then collecting the condensed steam. Which is free from many impurities, resulting in a purified liquid. This process is commonly used to purify water, alcohol, and other liquids.
Show/Hide Explanation
✅ Correct: 0 |
❌ Wrong: 0 |
📊 Total Attempted: 0
