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प्रश्न
True or false
Is melting of ice a reversible change?
विकल्प
True
False
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उत्तर
True
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संबंधित प्रश्न
State whether the following is physical or chemical change.
Digestion of food —
Write true or false
Melting of ice is a physical change.
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 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 formed | e. irreversible change |
| f . slow change |
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
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Select the chemical changes from the following list of changes
Respiration in mammals.
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
Give the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
Iron pipes coated with zinc do not get rusted easily.
