o A well near the beach is suspected to be contaminated with chloride ions from

Question

o A well near the beach is suspected to be contaminated with chloride ions from sea water. If Chloride is present, which of the following will produce a cloudy suspension when mixed with the water? A AgNO (aq) B. NaNO, (ag) C. acetic acid(a D. LiBr (ag) 37. Mixing which of the following will produce a precipitation reaction? A HNO (aq) and NaOH (aq) B. Pk(NO)(aq) and Na SOaq) C. NaOH(aq) and KBrag) D. Zn(s) and HClag) E. Na SO,(aq) and HCI(aq) 38. Which of the following precipitates will not dissolve in excess OH? A. Mg(OH): B. AIOH) C. Pb(OH) D. Cu(OH)2 E. Zn(OH) 39. Mixing which of the following aqueous solutions will not produce a precipitation reaction? A. KOH(limited) and Pb(NO) B. FeClh and Cu(NO,)2 C. CoSO, and Pb(NO,) D. CoSOs and (NH.)2S E. FeCl, and (NH:)2S 40. What type of reaction is: KHC()(aq) + HNO3(aq) ? KN0;(aq) + H2O(l) + CO2(g) ? A. acid-base precipitation C. redox D. decomposition E. None of above

Explanation / Answer

35.Pb2+will not dissolve in excess NH3 (it forms a white precipitate with ammonia).

36.AgNO3 + Cl- -------> AgCl +NO3- ( Ag+ forms white cloudy precipitate of AgCl).

37.Pb(NO3)2 will react with Na2SO4 to form a white ppt. of PbSO4.

38. Cu(OH)2  will not dissolve in excess OH-.

39.B. is the right answer because salts of NO3- are soluble in water.

40. It is an acid-base reaction.

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