Which of the following reactions have a positive ∆ Srxn ?
(a) A(s) + B(g) ⟶ 2C(g)
(b) 2A(g) + 2B(g) ⟶ 5C(g)
(c) 2A(g) + 2B(g) ⟶ 3C(g)
(d) A(g) + 2B(g) ⟶ 2C(g)



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