Which of the following processes is not spontaneous under standard conditions an

Question

Which of the following processes is not spontaneous under standard conditions and 25 degree C as written? (A) HF(aq) + NaOH(aq) rightarrow NaF (aq) + H_2 O (l) (B) Ca (OH)_2 (s) rightarrow Ca^2+ (aq) + 2OH^- (aq) (C) NH_3 (g) + HCl (g) rightarrow NH_4 Cl (s) (D) CO_2 (s) rightarrow CO_2 (g) (T = -78.5 degree C) (E) NaCl (s) rightarrow Na^+ (aq) + CI^- (aq) Which of the following will produce the most work (highest voltage) under standard conditions when coupled with Pb | Pb^2+? (A) Ag|Ag^+ (B) V|V^2+ (C) Cr | Cr^3+ (D) I_2 | I^- (E) Cu | Cu^2+ Balance the following reaction in acidic solution. Identify what is oxidized and what is reduced. I^- (aq) + NO_3^- (aq) rightarrow I_2 (aq) + NO(g)

Explanation / Answer

5.Decomposition reactions, sublimation reaction and ionisation reactions require heat so they are non spontaneous reactions.

Therefore options B,D&E are non spontaneous reactions.

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