When ice is heated, it changes to water and water on further heating gets converted to steam. What happens when steam is condensed
a) A new substance is formed
b) No new substance is form
c) Gaseous phase changes to liquid phase
d) Both (b) and (c) are correct
A change in which the original substance can be obtained back by change of conditions is called……………..
a) Reversible change
b) Physical change
c) Chemical change
d) Both a and b
When magnesium is burnt, heat and light are produced. The burning of magnesium is a ……
a) Reversible change
b) Physical change
c) Chemical and exothermic change
d) None of these
Chemical and endothermic change expansion of heating and contraction on cooling of metals is a………
a) Irreversible change
b) Physical change
c) Chemical change
d) None of these
Which of the following statement is correct…
a) Evaporation is a chemical change
b) Digestion of food is a chemical change
c) Burning of paper is a physical change
d) All of the above
Change in which only physical properties of a substance change and no new substance is formed is called………..
a) physical change
b) chemical change
c) both a and b
d) none of these
