Sublimation requires additional energy and is an:

endothermic change

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exothermic change

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both a and b

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none of above

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Solution

The correct option is C endothermic change
Sublimation is the process of transferring molecules in the solid phase to the gaseous phase. Since liquid state is skipped in this process, a large amount of energy has to be supplied in order to provide the required molecular motion to the molecules. Hence it is an endothermic change

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Similar questions

Q. The difference between an exothermic chemical reaction and an endothermic one is that one releases energy while the other uses energy. Which of the following is not an example of an exothermic reaction?

Question 4

Which of the following are exothermic processes?

(i) Reaction of water with quicklime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)

Q. Assertion :Exothermic reactions absorb heat.
Reason: Breaking covalent bonds always requires energy.

Q. Statement 1: Exothermic reactions absorb heat.
Statement 2: Breaking covalent bonds always requires energy.

Q. Which of the following are exothermic processes?
(i) Reaction of water with quicklime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)

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