The reaction, 2MO(s) + CO 2 (g) → M 2 O 3 (s) + CO(g) where M is a metallic element, is spontaneous at high temperatures but non-spontaneous at low temperatures.
If we assume that Δ r H ° and Δ r S ° are constant over a wide temperature range we can deduce that:

Question

The reaction, 2MO(s) + CO 2 (g) → M 2 O 3 (s) + CO(g) where M is a metallic element, is spontaneous at high temperatures but non-spontaneous at low temperatures. 
 If we assume that Δ r H ° and Δ r S ° are constant over a wide temperature range we can deduce that:

Answer

Δ r H ° > 0 and Δ r S ° > 0

Answer

Δ r H ° = 0 and Δ r S ° < 0

Answer

Δ r H ° = 0 and Δ r S ° = 0

Answer

Δ r H ° < 0 and Δ r S ° > 0

Answer

Δ r H ° > 0 and Δ r S ° < 0

Crowdly

The reaction, 2MO(s) + CO 2 (g) → M 2 O 3 (s) + CO(g) where M is a metallic elem...

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