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प्रश्न
Fill in the blank
Revolution of the earth around the sun is a ________ change.
उत्तर
Revolution of the earth around the sun is a natural periodic change.
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संबंधित प्रश्न
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
State whether the following is physical or chemical changes.
cutting wood into small pieces —
What are man-made changes ?
Which of the following are physical changes ?
- melting of iron metal
- rusting of iron metal
- bending of an iron rod
- drawing a wire of iron metal
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Distinguish between the following.
Physical change and chemical change
In a solution of salt in water, water is the solute
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then a 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:
