Tearing of paper is a
physical change
chemical change
irreversible change
none of these changes
Which one of the following is an example of physical change in nature?
Chemical weathering
Nitrogen cycle
Erosion
Carbon cycle.
Expansion is shown by
a piece of paper
a piece of iron
a piece of cotton
all of the above
When a candle burns,
Physical change occurs
Chemical change occurs
Both the changes occur
None of these changes occur
In which reaction, heat produces change in Chemical composition?
Sublimation of iodine
Conversion of liquid water into water vapour
Magnetization of iron piece
Decomposition of zinc carbonate.
Which of the following is a physical change ?
Melting of ice
Melting of wax
Formation of steam from water
All of these
Sublimation of iodine is an example of ______ change .
physical
chemical
exothermic
none of these
Which one of the following is a reversible change?
Ripening of fruits
Curdling of milk
Folding of paper
Burning of paper
When water freezes, it undergoes.
a physical change
a chemical change
vaporization
sublimation
What is the formula of rust ?
Fe3O4
Fe2O3
FeO
