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Mrs. Rama, a science teacher has arranged the following set-ups to demonstrate different types of changes.
Identify the types of changes taking place in these set-ups.

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In set-up 1, chemical-reversible change is taking place while in set-up 2, physical-irreversible change is taking place.

In set-up 1, chemical-irreversible change is taking place while in set-up 2, physical reversible change is taking place.

In both set-ups, physical-reversible changes are taking place.

In both set-ups, chemical-irreversible changes are taking place

answer is B.

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Detailed Solution

i) In set-up 1: heating of sugar results in carmalization. Carmel can’t be changed to sugar. Hence it is a irreversible reaction.

ii) In set-up II: Napthalene balls in a china dish and its covered with watch glass which have ice cubes. So, while heating naphthalene it undergoes sublimation and they get deposited when vapours of naphthalene touches glass beaker.

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