Q4 / 60 · JEE Advanced 2013 (Paper 2) · Chemistry

The thermal dissociation equilibrium of CaCO3s⁡ is studied under different conditions.
CaCO3s⁡⇌CaOs⁡+CO2g
For this equilibrium, the correct statement(s) is/are

  • Correct answer
    A
    ∆H is dependent on T.
  • Correct answer
    B
    K is independent of the initial amount of CaCO3.
  • C
    K is dependent on the pressure of CO2​ at a given T.
  • Correct answer
    D
    ∆H is independent of the catalyst, if any.

Solution

Kirchoff's Equation-
ΔHT=ΔH∘+∫298TΔCpreacdT
Δ H reac is dependent on temperature.
K = CO 2 × 1 1   as solids are treated at unit activity. K is independent of initial amount of CaCO3.
Kp=pCO2(g) at a given temperature Kp depends only on temperature.
Δ H = E a for - E b back  

A catalyst lowers only the activation energies & Δ H react is independent of catalyst.

Hence, the correct answer is options: 'A', 'B', 'D'.

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