6. Which of these statements are true about chemical equilibrium in general? (1)

Question

6. Which of these statements are true about chemical equilibrium in general? (1) At equiibrium, the the forward reacton is equal tothe rate of the reverse reaction (2) At?ibnum.the rate costart ot the forward reaction is equal to the rate constant of the reverse reaction (3) Equilibrium is the result off cessation of all chemical change (4) None of the above is correct 7. Certain features on the diagram below are indicated by double-headed arrows next to which are lethers Reaction progress Which lettered arrows correspond to the activation energy (Ea) and the energy change (AH) of the reverse reaction? (1)Aand D 2NO(g)+Og) is suspected to be second order in NO2. Which of the following (2) a plot of In NOH versus time (2) B and C (3) C and D (4) A and B 8. The reaction 2NO(g) graph plots would be the most useful to confirm whether or not the reaction is second order? (1) a plot of (NO-!-1 versus time [NOa] versus time (3) a plot of in [NOJ versus tme 4)a plot of 9. What is the overall reaction order for the reaction that has the rate law (1) zero order (2) first order (3) second order (4) third order 10. An increase in the temperature of the reactants causes an increase in the rate of reacion. The best explanation for this behavior is that as the temperature increases,(1) the concentration of reactants increases. (2) the activation energy decreases. (3) the fraction of colisions with total kinetic greater than E, increases(4) the collision frequency increases energy 11. According to the collision theory, all collisions do not lead to reaction. Which choice gives both reasons why not all collisions between reactant molecules lead to reaction? 1. The total energy of two colliding molecules is less than some minimum amount of 2. Molecules cannot react with each other unless a catalyst is present. 3. Molecules that are improperly oriented during collision will not react 4 Solids cannot react with gases energy (1) f and t (2)2 and (3)1 and3 (4)1 and

Explanation / Answer

Ans 6 : 1) At equillibrium the rate of forward reaction is equal to the rate of the reverse reaction.

The equillibrium condition does not mean that the chemical reaction has stopped , but it means that the system has reached to a point where no visible changes in the concentration of species occur , as the reaction proceeds in both the directions at equal rates.

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