Test: Previous Year Questions: Chemical Equilibrium - NEET MCQ

Consider the reaction equilibrium  2SO₂(g)+O₂(g)⇌2 SO₃ (g); ΔHº = -198 kJ

On the basis of Le Chatelier's principle, the condition favourable for the forward reaction is -

[AIEEE-2003]

What is the equilibrium expression for the reaction P_4(S) + 5O_2(g)  ⇌ P₄O_10(s) ?       

[AIEEE-2004]

For the reaction CO_(g) + Cl_2(g) ⇌ COCl_2(g) the K_P/K_C is equal to -  

[AIEEE-2004]

The equilibrium constant for the reaction N_2(g) + O_2(g) ⇌ 2NO_(g) at temperature T is 4×10^-4. The value of K_C for the reaction NO_(g) ⇌ 1/2 N_2(g) + O_2(g) at the same temperature is-   

[AIEEE-2004]

For the reaction 2 NO_2(g) ⇌ 2 NO_(g) + O_2(g),

(K_c = 1.8 × 10^_6 at 184ºC)

(R = 0.0831 kJ/(mol.K))

When K_p and K_c are compared at 184ºC it is found that 

[AIEEE-2005]

The exothermic formaton of ClF₃ is represented by the equation -

Cl_2(g)+3F_2(g)⇌ 2ClF_3(g) ; Δ_rH = -329 kJ

Which of the following will increase the quantity of ClF₃ in an equilibrium mixture of Cl₂, F₂ and ClF₃ ?

A schematic plot of ln K_eq versus inverse of temperature for a reaction is shown below

The reaction must be

An amount of solid NH₄HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm pressure. Ammonium hydrogen sulphide decomposes to yield NH₃ and H₂S gases in the flask. When the decomposition reaction reaches equilibrium, the total pressure in the flask rises to 0.84 atm ? The equilibrium constant for NH₄HS decomposition at this temperature is       

[AIEEE-2005]

Phosphorus pentachloride dissociates as follows, is a closed reaction vessel,

PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)

If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl₅ is x, the partial pressure of PCl₃ will be    

[AIEEE 2006]

The equilibrium constant for the reaction

SO₃(g) ⇌ SO₂(g) + 1/2 O₂(g) is K_c = 4.9×10^-2. The value of K_c for the reaction

2SO₂(g)+O₂(g) ⇌ 2SO₃(g) will be

[AIEEE 2006]

For the following three reactions a, b and c, equilibrium constants are given       

(a) CO(g) + H₂O(g) ⇌ CO₂(g) +H₂ (g); K₁

(b) CH₄(g) + H₂O(g) ⇌ CO(g) + 3H₂(g); K₂

(c) CH₄(g) + 2H₂O(g) ⇌ CO₂(g) + 4H₂(g); K₃

Which of the following relations is correct

The equilibrium constants Kp₁ and Kp₂ for the reactions X ⇌ 2Y and Z ⇌ P + Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressures at these equilibria is -     

[AIEEE 2008]

A vessel at 1000 K contains CO₂ with a pressure of 0.5 atm. Some of the CO₂ is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of Kp i_s: 

 [AIEEE 2011]

The equilibrium constant (K_c) for the reaction N₂(g)+O₂(g) → 2NO(g) at temperature T is

4×10^-4. The value of K_c for the reaction,
NO(g)→ ½ N₂(g) + ½O₂(g) at the same temperature is:  

[AIEEE 2012]