Consider a reaction, A+B AB. At which time this system first reached equilibrium
ID: 531419 • Letter: C
Question
Consider a reaction, A+B AB. At which time this system first reached equilibrium? (A) 1 (B) 3 (C) 6 (D) It does not reach equilibrium. The reaction X(g) rightarrow Z(g) has an equilibrium constant of 2.5. Which picture best illustrates an equilibrium mixture? Use the data from the graph and determine the equilibrium constant for the conversion of Compound X (the reactant) to Compound Y (the product). (A) 0.03/(0.04)^2 (B) (0.04)^2/0.03 (C) 0.04/0.03 (D) (0.03)^2/0.04 This equilibrium is established. Fe^3+(aq) + SCN^-(aq) FeSCN^2+(aq) pale yellow colorless red Which addition leads to the described color change? (A) Added Ag^+ reacts with SCN^- and the red color intensity increases. (B) Fe(NO_3)_3 is added and the red color intensity decreases. (C) NaSCN is added and the rod color intensity decreases. (D) Added Hg^2+ reacts with SCN^- and the red color intensity decreases. Consider the reaction 2SO_3(g) 2SO_2(g) + O_2(g) for which K_4 = 3.6 at a given temperature. A 1.0 L flask at the temperature initially contains 2.0 mol SO_3, 4.0 mol SO_3, and 0.50 mol O_2. As equilibrium is established at that temperature, the concentration of O_2 (A) will decreases. (B) will increase. (C) will remain the same. (D) cannot be predicted. A pH 7.2 buffer is prepared by dissolving equimolar amounts of H_2 PO_4^- and HPO_4^3- in water: H_2PO_4^- + H_2O HPO_4^3+ + H_3O^- The addition of HCI to this buffer results in (A) a decrease in the [H_2PO_4^-]. (B) an increases in the [HPO_4^2-]. (C) a decreases in the [HPO_4^3-]. (D) to change in the concentration of [H_2PO_4^-] or [HPO_4^2-].Explanation / Answer
1.
when reaction will be at equlibrium, concentration of reactant and product does not change with time.
At, time =3
concentration of A=2, B=3, AB=3,
which is not changing with time.
hence, reaction is at equlibrium for first time at time =3
so, answer B
2.
K=[Z]/[X]=2.5
in D,
[Z]=5,
[X]=2
so, K=5/2=2.5
option D is correct.
I am allowed to answer only one question at a time.