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In which of the following cases, the reaction is spontaneous at all temperatures ?

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In which of the following cases, the reaction is spontaneous at all temperatures ? 

(a) ΔH > 0, ΔS > 0 

(b) ΔH < 0, ΔS > 0 

(c) ΔH < 0, ΔS < 0 

(d) ΔH > 0, ΔS < 0

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(b) ΔH < 0, ΔS > 0 

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