Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEETChemistryChemical Equilibrium

The thermal decomposition of calcium carbonate occurs in a closed vessel according to the following equation: CaCO ₃( s ) CaO ( s ) + CO ₂( g ) If 2.0 moles of CaCO ₃ are placed in a 10.0 L closed vessel and allowed to reach equilibrium at a certain temperature, the equilibrium constant K_c for the reaction is found to be 0.05 M . What is the equilibrium concentration of CO ₂( g ) ?

Options

  1. A0.2 M
  2. B0.5 M
  3. C0.005 M
  4. D0.05 M

Correct answer

D. 0.05 M

Step-by-step solution

The given reaction is a heterogeneous equilibrium: CaCO ₃( s ) CaO ( s ) + CO ₂( g ) By convention, the active masses (molar concentrations) of pure solids and pure liquids are taken as unity and are excluded from the equilibrium constant expression. Therefore, the equilibrium constant K_c depends only on the concentration of the gaseous product: K_c = [ CO ₂( g )] Given that K_c = 0.05 M , the equilibrium concentration of CO ₂( g ) is simply equal to the value of K_c . [ CO ₂( g )] = 0.05 M The initial moles of Ca

Practice Chemical Equilibrium on Quantrex Academy →

More from Chemical Equilibrium

For which of the following solids does solubility decrease with an increase in temperature? 2026Given below are certain reactions. Identify the reaction for which K_p K_c : 2026Higher yield of NO in N ₂( ~g )+ O ₂( ~g ) 2 NO ( g ) can be obtained at [ H of the reaction =+180.7 ~kJ ~mol ⁻¹ ] A. higher temperature B. lower temperature C. higher concentratio 2025For the reaction A ( g ) 2 ~B ( ~g ) , the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500 , at 1000 K . [Given : R =0.0831 ~L 2025Consider the following reaction in a sealed vessel at equilibrium with concentrations of N ₂=3.0 10⁻³ M , O ₂=4.2 10⁻³ M and NO =2.8 10⁻³ M . 2 NO _ ( g ) N _ 2( ~g ) + O _ 2( ~g ) 2024For the reaction 2 ~A B + C , K _ C =4 10⁻³ . At a given time, the composition of reaction mixture is: [ A ]=[ B ]=[ C ]=2 10⁻³ M . Then, which of the following is correct? 2024For the reaction in equilibrium N ₂( ~g )+3 H ₂( ~g ) 2 NH ₃( ~g ), H =- Q Reaction is favoured in forward direction by: 2024In which of the following equilibria, K _ p and K _ c are NOT equal? 2024 Full Chemical Equilibrium list All NEET PYQs