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When CaCO(3) is heated to a high tempera...

When `CaCO_(3)` is heated to a high temperature, it undergoes decomposition into `CaO` and `CO_(2)` whereas it is quite stable at room temperature. The most likely explanation of its is

A

The enthalpy of reaction `(DeltaH)` overweighs the term `T DeltaS` at high temperature.

B

The term `T DeltaS` overweights the enthalpy of reaction at high temperature

C

At high temperature, both enthalpy of reaction and entropy change becomes negative.

D

None of these.

Text Solution

AI Generated Solution

To solve the question regarding the stability of calcium carbonate (CaCO₃) at room temperature and its decomposition upon heating, we can analyze the thermodynamic principles involved. ### Step-by-Step Solution: 1. **Understanding the Reaction**: When calcium carbonate (CaCO₃) is heated, it decomposes into calcium oxide (CaO) and carbon dioxide (CO₂): \[ \text{CaCO}_3 (s) \rightarrow \text{CaO} (s) + \text{CO}_2 (g) ...
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Gibbs Helmholtz equation relates the enthalpy, entropy and free energy change of the process at constant pressure and temperature as DeltaG=DeltaH-TDeltaS " (at constant P, T)" In General the magnitude of DeltaH does not change much with the change in temperature but the terms TDeltaS changes appreciably. Hence in some process spontaneity is very much dependent on temperature and such processes are generally known as entropy driven process. When CaCO_(3) is heated to a high temperature it decomposes into CaO and CO_(2) , however it is quite stable at room temperature. It can be explained by the fact that

A: H_(2) when allowed to expand at room temperature it causes heating effect. R: H_(2) has inversion-temperature much below room temperature.

Knowledge Check

  • Wolff rearrangement When alpha -Diazoketones are photo-irradiated or heated at high temperature or reacted with silver oxide or silver salts at room temperature, they loose nitrogen and rearrange to form ketene. The ketenes reacts rapidly with water, alcohol and amines. Therefore, the reactions called Wolff-rearrangement. Product (A) is :

    A
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    D

  • Wolff rearrangement When alpha -Diazoketones are photo-irradiated or heated at high temperature or reacted with silver oxide or silver salts at room temperature, they loose nitrogen and rearrange to form ketene. The ketenes reacts rapidly with water, alcohol and amines. Therefore, the reactions called Wolff-rearrangement. Major product of the reaction is :

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    B
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    D
    None of these

  • Wolff rearrangement When alpha -Diazoketones are photo-irradiated or heated at high temperature or reacted with silver oxide or silver salts at room temperature, they loose nitrogen and rearrange to form ketene. The ketenes reacts rapidly with water, alcohol and amines. Therefore, the reactions called Wolff-rearrangement. , Product (A) is :

    A
    B
    C
    D

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    Wolff rearrangement When alpha -Diazoketones are photo-irradiated or heated at high temperature or reacted with silver oxide or silver salts at room temperature, they loose nitrogen and rearrange to form ketene. The ketenes reacts rapidly with water, alcohol and amines. Therefore, the reactions called Wolff-rearrangement. , Product (A) is :

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