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प्रश्न
Give two examples for each of the following cases:
Physical changes which are not reversible.
उत्तर
(i) Cutting of paper
(ii) Breaking of glass
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संबंधित प्रश्न
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
Write short answer.
Name two reversible changes.
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
State whether the following is physical or chemical change.
Digestion of food —
True or false
Dissolving of a solid in liquid is a physical change.
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
Select the chemical changes from the following list of changes
Breaking of glass
Water is known as a universal solvent. Why?
