Question

11.An aqueous solution of NH4NO3 would be: Select one: a. neutral b. impossible to tell c. acidic d. basic 12.A given reaction has a Kc value of is 6.25 x 10-4. Select the BEST option below: At the same conditions Qc is found to be 6.25 x 10-3 . Select one: a. the system is at equilibrium b. products are favoured, the reaction proceeds right c. reactants are favoured, the reaction proceeds left d. it is impossible to determine which way the reaction proceeds without the reaction equation. 13.At equilibrium: Select one: a. the concentration of reactants and products are equal b. the reverse reaction occurs at a higher rate than the forward reaction c. the reverse reaction and the forward reaction occur at the same rate d. the reverse reaction is occurring at a slower rate than the forward reaction e. the forward and reverse reactions are no longer occurring f. two of the options are correct g. none of the options are correct

Answer 1

11. c) acidic because NH ₄ NO ₃ is a salt of a weak base NH ₄ OH   and strong acid H NO ₃ .

12. d) we can't predict which way the reaction would proceed since the reaction equation is not given.

If it would be given then first we'll find Q _c^. If

• K_c= Q_c reaction is at equilibrium
• K_c > Q_c reaction will proceed in the forward direction in order to increase the concentrations of the products
• K_c < Q_c reaction will proceed in the backward direction in order to increase the concentrations of the reactants

13. c) At equilibrium rate of the forward reaction i.e. k_f becomes equal to the rate of the backward reaction i.e. k_b Irresespective of the concentrations of the reactants and the products.