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Q.

In which process no heat is required?
(i) Isothermal 
(ii) Adiabatic
(iii) Free expansion 
(iv) Cyclic

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a

(i, iii)

b

(iii, iv)

c

(ii, iii)

d

(i, iv)

answer is C.

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Detailed Solution

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In adiabatic process no exchange of heat takes place between the system and its surroundings  . In free expansion work done is zero and hence no heat is required.

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