Solutions A and B are both clear and colourles. When solution A is mixed with solution B, the temperature of the mixture increases and a yellow precipitate is observed. What can be concluded from these observations?A. The reaction is thermodynamically favoured ( spontaneous) at all temperaturesB. The reaction is thermodynamically favoured ( spontaneous) only athigh temperatureC. The reaction is thermodynamically favoured ( spontaneous) only at low temperatureD. The reaction is not thermodynamically favoured ( spontaneous) at any temperature.

Solutions A and B are both clear and colourles. When solution A is mix

1.	Solutions A and B are both clear and colourles. When solution A is mixed with solution B, the temperature of the mixture increases and a yellow precipitate is observed. What can be concluded from these observations?A. The reaction is thermodynamically favoured ( spontaneous) at all temperaturesB. The reaction is thermodynamically favoured ( spontaneous) only athigh temperatureC. The reaction is thermodynamically favoured ( spontaneous) only at low temperatureD. The reaction is not thermodynamically favoured ( spontaneous) at any temperature.
Answer» Correct Answer - C Since on mixing , temperature increses, this means that reaction is exothermic, i.e., energy factor favours the process.Since a precipitate is formed on mixing, this means entropy decreases,i.e.,entropy factor opposes the process. `DeltaG= DeltaH-T DeltaS`. For reaction to be spontaneous, `DeltaG` should be `-ve`. As `DeltaH` is`-ve` and`DeltaS `is `-ve`, `DeltaG` can be -ve only if T is low.Hence, reaction will be spontaneous at low temeprature.

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