Chemistry
Burning of a piece of paper into ash is a:
- periodic change
- natural change
- reversible change
- permanent change
Phy & Chem Changes
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Answer
permanent change
Reason — Burning of a piece of paper into ash is a permanent change because paper cannot be obtained back from ash. A new substance, ash, is formed and the change is irreversible.
Periodic changes occur at regular intervals (like day and night). Natural changes occur without human involvement (like rain, seasons). Reversible changes can be undone.
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Related Questions
Which of the following is a non-periodic change?
- Change of day and night
- Change of seasons
- Landslides
- Full moon and new moon nights
Which of the following is a slow change?
- Rusting of iron
- Burning of wood
- Burning of a cracker
- Switching on a fan
Which of the following is a physical change?
- Cooking of food
- Formation of curd
- A glass cut into pieces
- Boiling of eggs
In a chemical change :
- a new substance is formed
- energy is either released or absorbed
- the change is irreversible
- all of the above