3) Paheli's mother made a concentrated sugar syrup by dissolving sugar in het water. On cooling, crystals of sugar got separated. This indicates a -----
a) physical change that can be reversed.
b) chemical change that can be reversed.
c) physical change that cannot be reversed.
d) chemical change that cannot be reversed.
4) Which of the following statements is incorrect for and chemical reaction?
a) heat may be given out but never absorbed.
b) sound may be product.
c) a colour change may take place.
d) a gas may be evolved.
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