A change in which only the physical properties of the substance are changed, while its chemical composition remains unchanged, is called a physical change. Crystallisation of substance and demagnetisation of magnets come under this change.
A change in which chemical composition and chemical properties of the reacting substances undergo a change is called a chemical change. For eg., curdling of milk, digestion of food, rusting of iron
a. III IV I II b. IV III II I c. I II III IV d. II I IV III
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Q3
Match the reasons given in column 2 to the features of cacti in column 1.
FeatureofcactiReasonsa.Spiny leaves(i)Absorbing water from depths of soilb.Thick, round fleshy stems(ii)Prevent loss of water by transpirationc.Deep roots(iii)Store waterd.Closed stomata during the day(iv)Prevent animals from eating the cactuse.Carbon dioxide storage during the night
Choose the correct option that matches correctly. There can be multiple matches.
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Q4
Arrange the following carbocations in decreasing order of stability
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Q5
Match the entries of column I with column II Column AColumn B(a) First artificial plastic(i) Polythene(b) First artificial fibre(ii) DNA (c) Biopolymer(iii) Nylon (d) Linear polymer(iv) Bakelite