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Q.

Consider the following chemical changes,I:CaC2(s)+2H2O(1)⟶Ca(OH)2(s)+C2H2(g)II:2SO2(g)+O2(g)⟶2SO3(g)III:2Fe(s)+3H2O(g)⟶Fe2O3(s)+3H2(g)Work is done by the system in the cases of

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a

I and II

b

II and III

c

Only I

d

None of the above

answer is C.

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