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Melting of wa...

Question

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

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Solution

(a) physical change

Melting of wax and heating of blade are the examples of physical change.

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Q. State whether the following statements are true or false. Rewrite the false ones correctly.
(a) All irreversible changes are chemical changes.
(b) A liquid can sublime.
(c) The evaporation of water take place only at 100°C. when it is boiling.
(d) The melting of ice is a physical change.
(e) The souring of milk is a periodic change.
(f) The flowering of trees is a periodic change.
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1. Melting of ice-cream is an example of a/an .................... (reversible/irreversible) change.
2. Ripening of fruits is an example of a/an .................... (reversible/irreversible) change.
3. Cooking of foood is an example of a/an .................... (reversible/irreversible) change.
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(a) physical changes.
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(c) reversible changes
(d) irreversible changes

Q. Statement I: The melting of wax is a physical change.
Statement II: The burning of wick for the production of heat and light is a chemical change.

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(c) periodic change
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