Exams › JEE Main › Chemistry

At 600 K, 2 mol NO are mixed with 1 mol O2 and the reaction 2NO(g) + O2(g) <=> 2NO2(g) reaches equilibrium at a total pressure of 1 atm. Analysis shows 0.6 mol O2 present at equilibrium. Calculate the equilibrium constant Kp for the reaction (nearest integer).

1. 1.93 atm⁻¹
2. 0.52 atm⁻¹
3. 5.0 atm⁻¹
4. 21 atm⁻¹

Correct answer: 1.93 atm⁻¹

Solution

O2 reacted = 0.4 mol, so NO reacted = 0.8 mol (NO left 1.2), NO2 formed = 0.8 mol. Total moles = 2.6. Converting to partial pressures at 1 atm and substituting gives Kp ~= 1.93 atm⁻¹.

Related JEE Main Chemistry questions

• The solubility product constants of Ag2CrO4, AgCl, AgBr and AgI are 1.1 × 10⁻¹², 1.8 × 10⁻¹⁰, 5.0 × 10⁻¹³ and 8.3 × 10⁻¹⁷, respectively. If AgNO3 solution is added to a mixture containing equal amounts of NaCl, NaBr, NaI and Na2CrO4, which silver salt will begin to precipitate at the highest Ag+ concentration, i.e., the last one to form?
• Two sparingly soluble salts, MY and NY3, each have the same solubility product constant, Ksp = 6.2 × 10⁻¹³, at room temperature. Which of the following statements is correct for these two salts?
• Given the equilibrium constants for these reactions: N2 + 3H2 ⇌ 2NH3, K1 N2 + O2 ⇌ 2NO, K2 H2 + 1/2 O2 ⇌ H2O, K3 What is the equilibrium constant K for the reaction 2NH3 + 5/2 O2 ⇌ 2NO + 3H2O ?
• In a saturated solution of Ag2C2O4, the concentration of Ag+ ions is 2.2 × 10⁻⁴ mol L⁻¹. The solubility product constant (Ksp) of Ag2C2O4 is:
• For the gaseous equilibrium PCl₅ ⇌ PCl₃ + Cl₂, how does the degree of dissociation (α) depend on the equilibrium pressure (p)?
• A movable-piston vessel of volume 20 L at 400 K contains CO₂(g) at a pressure of 0.4 atm along with excess SrO (ignore the solid’s volume). The piston is pushed inward, reducing the container volume. What is the largest volume the vessel can have when the CO₂ pressure reaches its highest value? Given: SrCO₃(s) ⇌ SrO(s) + CO₂(g), Kp = 1.6 atm

⚔️ Practice JEE Main Chemistry free + battle 1v1 →