Heterogeneous equilibria and simultaneous equilibria

27 questions on Heterogeneous equilibria and simultaneous equilibria from the Chemical Equilibrium chapter: 5 NEET level, 11 JEE Main, 11 JEE Advanced. Each one opens with its answer and solution.

• For CaCO3(s) <=> CaO(s) + CO2(g) at a fixed temperature, the expression for K_p is NEET level
• The expression for K_c of the reaction C(s) + CO2(g) <=> 2CO(g) is NEET level
• In a closed vessel at constant temperature, CaCO3(s) <=> CaO(s) + CO2(g) is at equilibrium. If some more solid CaCO3 is added, the equilibrium pressure of CO2 NEET level
• For NH4HS(s) <=> NH3(g) + H2S(g), with pressures in atm, the unit of K_p is NEET level
• For 3Fe(s) + 4H2O(g) <=> Fe3O4(s) + 4H2(g), the unit of K_c is NEET level
• 0.010 mol of CaCO3(s) is placed in an evacuated 5.0 L rigid vessel and heated to 1000 K, where K_p = 0.50 atm for CaCO3(s) <=> CaO(s) + CO2(g). Take R = 0.0821 ... JEE Main level
• Solid NH4HS is placed in an evacuated flask and decomposes: NH4HS(s) <=> NH3(g) + H2S(g). At equilibrium the total pressure is 0.90 atm. Calculate K_p in atm^2,... JEE Main level
• Solid carbon is in equilibrium with a gas mixture: C(s) + CO2(g) <=> 2CO(g). The total pressure is 2.0 atm and the mole fraction of CO in the gas phase is 0.40.... JEE Main level
• A sample of CaCO3(s) is in equilibrium with CaO(s) and CO2(g) in a closed cylinder with a movable piston at constant temperature. Both solids remain present in ... JEE Main level
• Solid NH4I decomposes as NH4I(s) <=> NH3(g) + HI(g) with K_p1 = 0.72 atm^2, and the HI formed also dissociates as 2HI(g) <=> H2(g) + I2(g) with K_p2 = 0.0144 (d... JEE Main level
• At a certain temperature, C(s) + H2O(g) <=> CO(g) + H2(g) has K_p1 = 1.6 atm and CO(g) + H2O(g) <=> CO2(g) + H2(g) has K_p2 = 0.40. For C(s) + 2H2O(g) <=> CO2(g... JEE Main level
• For C(s) + CO2(g) <=> 2CO(g), K_p = 1.9 atm at 1000 K. Using R = 0.0821 L atm mol^-1 K^-1, K_c in mol L^-1 is JEE Main level
• Hydrogen reduces solid iron(II,III) oxide according to Fe3O4(s) + 4H2(g) <=> 3Fe(s) + 4H2O(g), for which K_p = 40 at the working temperature. At equilibrium the... JEE Main level
• Solid NH4Cl is in equilibrium with NH3(g) and HCl(g) in a rigid vessel at constant temperature, with p_NH3 = p_HCl = p_0. A little extra NH3(g) is now injected ... JEE Main level
• For C(s) + CO2(g) <=> 2CO(g) with Delta H > 0, in a closed vessel, which statements are correct? JEE Main level
• Excess CaCO3(s) is heated in an evacuated rigid 2.0 L vessel at 1100 K, where K_p = 0.50 atm for CaCO3(s) <=> CaO(s) + CO2(g). Take R = 0.0821 L atm mol^-1 K^-1... JEE Main level
• A rigid 3.0 L vessel at 1073 K holds CaCO3(s), CaO(s) and CO2(g) at equilibrium, CaCO3(s) <=> CaO(s) + CO2(g), with K_p = 0.48 atm. The vessel is then expanded ... JEE Advanced level
• A closed vessel contains excess CaCO3(s), CaO(s) and C(s) at a fixed temperature, so that two equilibria hold together: CaCO3(s) <=> CaO(s) + CO2(g) with K_p1 =... JEE Advanced level
• 0.80 mol of CO(g) is passed into a 4.0 L rigid vessel containing excess FeO(s) and Fe(s) at a fixed temperature, where K_c = 0.65 for FeO(s) + CO(g) <=> Fe(s) +... JEE Advanced level
• Pure CO2 at 3.0 atm is passed into a rigid vessel containing excess hot C(s). At equilibrium of C(s) + CO2(g) <=> 2CO(g) at constant temperature, K_p = 1.5 atm.... JEE Advanced level
• Solid ammonium carbamate decomposes as NH2COONH4(s) <=> 2NH3(g) + CO2(g). In an evacuated vessel at 300 K the total pressure at equilibrium is 0.60 atm. Using R... JEE Advanced level
• For Ni(s) + 4CO(g) <=> Ni(CO)4(g), K_p = 1.5x10^-2 atm^-3 at 330 K. Using R = 0.0821 L atm mol^-1 K^-1, K_c in L^3 mol^-3 is approximately JEE Advanced level
• Excess solid NH4Cl is placed in an evacuated rigid vessel that already contains NH3(g) at 0.50 atm. At the working temperature K_p = 0.040 atm^2 for NH4Cl(s) <=... JEE Advanced level
• For a gas-phase reaction at 400 K, the ratio K_p/K_c is found to be about 1.08x10^3 (pressures in atm, concentrations in mol L^-1; R = 0.0821 L atm mol^-1 K^-1)... JEE Advanced level
• A rigid vessel at fixed temperature contains excess CaCO3(s), CaO(s) and C(s) in equilibrium with CO2(g) and CO(g) through CaCO3(s) <=> CaO(s) + CO2(g) and C(s)... JEE Advanced level
• Solid NaHCO3 decomposes in an evacuated vessel at 400 K: 2NaHCO3(s) <=> Na2CO3(s) + H2O(g) + CO2(g). At equilibrium the total pressure is 1.60 atm. Use R = 0.08... JEE Advanced level
• Solid NH4HS and solid NH4Cl are both present in an evacuated vessel at fixed temperature, so that NH4HS(s) <=> NH3(g) + H2S(g) (K_p1 = 0.12 atm^2) and NH4Cl(s) ... JEE Advanced level