Class 7 Chemistry Question Preview (ID: 51151)
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Curdling of milk is an example of
a) chemical change
b) physical change
c) natural change
d) man-made change
Growth of man and plants are examples of
a) natural change
b) desirable change
c) both 1 and 2
d) none of these
Liquefaction is also defined as
a) sublimation
b) deposition
c) condensation
d) freezing
sublimation of ammonium chloride is an example of
a) physical change
b) chemical change
c) both 1 and 2
d) none of these
The state of matter in which shape in indefinite but volume is definite
a) solid
b) liquid
c) gas
d) both 1 and 2
An example of undesirable change which can be converted into desirable change
a) curdling of milk
b) producing electricity from garbage
c) earthquake
d) flood
The change which are permanent and irreversible are
a) physical change
b) natural change
c) chemical change
d) man made change
Matter made of same kind of particles is said to be
a) solution
b) solute
c) heterogeneous
d) homogeneous
The gas evolved when lead dioxide is
a) nitrogen
b) carbon dioxide
c) oxygen
d) chlorine
Ammonium Chloride a sublimable solid undergoes
a) decomposition
b) dissociation
c) synthesis
d) combination
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