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Irreversible Change

Formation of ...

Question

Formation of curd from milk is the example of
(a) slow
(b) chemical change
(c) periodic change
(d) physical change

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Solution

(b) chemical change
Formation of curd from milk is an example of chemical change.

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Formation of curd from milk is a physical change.

Q. Melting of wax and heating of blade are the examples of
(a) physical change
(b) chemical change
(c) periodic change
(d) irreversible change

Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Souring of milk is a physical change. ( )
2. Digestion of food is a physical change. ( )
3. Crystallisation is widely used to prevent rusting. ( )
4. Formation of steam from water on heating is a physical change. ( )
5. Glowing of the filament of a bulb is an example of a chemical change. ( )

Q. Classify the following into slow and fast changes:
(i) Spinning of top
(ii) Formation of day and night
(iii) Formation of curd from milk
(iv) Change of season
(v) Making curd from milk by adding lemon juice.

Q. (a) Differentiate between physical and chemical changes.
(b) Give reasons:
(i) Ripening of fruit is a desirable change.
(ii) Curdling of milk is a slow change.
(ii) Digestion of food is an irreversible change.

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