Question

10. Which of the following mixtures has lower pH a) Equal volumes of 0.10M HCIO, and 0.10M NaOH b) Equal volumes of 0.10M HCIO and 0.10M NH Ans: 1. Does the pH increase, decrease or remain same on addition of each of the following a) NH4NO) to NHs solution Ans: b) Na:CO) to NaHCO3 solution Ans: c) NaCIO4 to NaOH solution Ans: 12. Which of the following solutions give a buffer solution when equal volumes are mixed? a) 0.10M NaF and 0.10M HF c) 0.10M NaOH and 0.20M HF b) 0.10M NaOH and 0.10M HF d) 0.20M NaF and 0.10M HF Ans: Circle the correct answer 13. Which of the following compounds, when added to a solution of ammonium nitrate, will result in the formation of a buffer solution? A. NH B. HNO C. NaNO) D. NH4CI 14. For the following equilibrium: HF(a)+ H2OmHO (a)+ F(ash The above system will behave as a buffer when the [F] is approximately equal to A)К, В) [HF] CH:O] DHO'] 15. A basic buffer solution can be prepared by mixing equal numbers of moles of A. NH4CI and HCI B.NaCl and NaOH C.Na:CO) and NaHCO3 D.NaCH)COO and CH)COOH 16. For the following buffer equilibrium: HF + HO HO" F What concentration would limit the buffering action if more strong acid were added? В. [HF] C.[H2O A.[F] D.IHO'] 17. Which of the following will have the smallest Kb value? (Use ka values from Appendix) C.CN B.NH) A.JO D.HPO 18. Which of the following salt solutions is acidic? B.AICI C.Li CO A.NaBr 4

Answer 1

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