Which of the following is NOT a physical change?
Tearing a paper
Bending an iron rod
Freezing water into ice
None of these
Which of the following is NOT a chemical change?
Digestion of food
Precipitation of rain and snow
Rusting of iron
Burning of paper
i. A piece of magnesium gives of bright flames when burnt.ii. A piece of iron glows red when heated strongly.
Glowing of an electric bulb is a ________ change.
physical
chemical
both physical and chemical changes
none of these
