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प्रश्न
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
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उत्तर
Iron III oxide [Fe2O3x H20]
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संबंधित प्रश्न
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Write true or false for the statement
Decomposition of leaves is a fast change.
Write true or false
Burning of sugar is a temporary change.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Slow and fast change.
Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.
Select the chemical changes from the following list of changes
The carbon cycle.
Tearing of sheet of paper into pieces is ______ By the process of Heating of water, change.
Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are:
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
Adding sugar to milk is a physical change.
