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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 on the system in the case of

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a

I, II and III

b

I and II

c

Only I

d

Only II

answer is D.

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Detailed Solution

(II) only. In option 1 and 3, we can see solids are present and in option 2 all the reactants and products are in same state.
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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 on the system in the case of