In which of the following examples the change in state of a substance is observed?
(i) Melting of chocolate
(ii) Boiling of water
(iii) Cutting of vegetables
(iv) Pouring of milk in tea

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Solution

$∙$ During melting of chocolate the state of chocolate changes from solid to liquid.
$∙$ During boiling, the state of water changes from liquid to vapour. Hence, the state change is observed in these cases.
$∙$ Pouring of milk in tea and cutting of vegetables does not involve any state change.

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Q. In which of the following examples the change in state of a substance is observed?
(i) Melting of chocolate
(ii) Boiling of water
(iii) Cutting of vegetables
(iv) Pouring of milk in tea

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(i) Cooking of food (ii) Boiling of water

(iii) Cutting of trees (iv) Dissolving salt in water

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i. Boiling
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(ii) Cutting vegetables

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Q. In which of the following examples the change in state of a substance is observed?

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In which of the following examples the change in state of a substance is observed? (i) Melting of chocolate (ii) Boiling of water (iii) Cutting of vegetables (iv) Pouring of milk in tea

∙ During melting of chocolate the state of chocolate changes from solid to liquid. ∙ During boiling, the state of water changes from liquid to vapour. Hence, the state change is observed in these cases. ∙ Pouring of milk in tea and cutting of vegetables does not involve any state change.

In which of the following examples the change in state of a substance is observed?
(i) Melting of chocolate
(ii) Boiling of water
(iii) Cutting of vegetables
(iv) Pouring of milk in tea