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प्रश्न
Sublimation is classified as a physical change. Why ?
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उत्तर
Physical changes are those in which no new substance is formed. In sublimation there is direct conversion of solid into gas and vice versa. Thus the substance remains the same.
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संबंधित प्रश्न
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
Write short answer.
Name two reversible changes.
Write true or false
Rusting of iron is a chemical change.
Tick (√) the correct alternative from the choice given for the following statement
Which one of the following is volatile in nature ?
Tick the most appropriate answer.
Physical changes are
Classify the following changes as physical or chemical.
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
Give four difference between physical and chemical changes.
Select the chemical changes from the following list of changes
Respiration in mammals.
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
