Consider a reaction, A+B doublearrow AB. At which time has this system first rea

Question

Consider a reaction, A+B doublearrow AB. At which time has this system first reached equilibrium? 1 3 6 It does not reach equilibrium The reaction X_(g) rightarrow Z_(g) has an equilibrium constant of 25. 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). 0, 03 (0, 04)^2 (0.04)^2/0.03 0.04/0.03 (0.03)^2/0.04 This equilibrium is established Fe^3 + (aq). + SCN(aq) doublearrow feSCN^2 + (aq) pale yellow colorless red Which addition leads to the described color change? Added Ag^+ reacts with SCN6- and the red color intensity increases. Fe(NO_3), is added and the red color intensity decreases NaSCN is added and the red color intensity decreases Added Hg^+ reacts with SCN and the red color intensity decreases. Consider the reaction 2SO_y(g) doublearrow 2SO_2(g) + O_2(g) for which K_c 3.6 at a given temperature. A 10 L flask at that temperature initially contains 20 mol SO_3, 4.0m SO_2 and 0.50 mol O_2. As equilibrium is established at that temperature, the concentration of O_2, will decrease Will increase will remain the same. cannot be predicted. A pH 7.2 buffer is prepared by dissolving equimolar amounts of H_2 PO_4^- and HPO_4 in water: H_2 PO_4^- + H_2O doublearrow HPO_4^- + H_3O^- The addition of HCl to this buffer results in decrease in the [H_2PO_4^-]. an increase in the [HPO_4^2-], a decrease in the[HPO_4^2-] no change in the concentration of[H_2PO_4^-] or [HPO_4^2 -]

Explanation / Answer

2) In choice D ,

   Z = 5 , X = 2

   Equilibrium constant K = [Z]/[X]

                                    = 5/2

     = 2.5

Therefore,

   ans = D

6) When HCl is added to the given buffer, it reacts with HPO42- and leads to formation of H2PO4-

     That means decrease in [ HPO42-] and increase in [H2PO4-]

       HPO42- + HCl ---------------> H2PO4-

Hence, decrease in [ HPO42-].

Therefore,

    ans = C

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