28 Based on the activity series, which one of the reactions below will occur? a.

Question

28 Based on the activity series, which one of the reactions below will occur? a. Zn (s)+ Mnl(aq) Znly (aq)+ Mn (s) b. SnCl2(aa)+ Cu (s)-Sn (s)+CuCl:(aq) c. 2AgNO (aq)+ Pb (s) 2Ag (s)+ Pb(NOj)h (aq) d. 3Hg (1)+2Cr(NO)(a) 3HgNO+2Cr (s) e. 3FeBr (4)+2Au (s) 3Fe (s) +2AuBrs (ag) The balanced net ionic equation for precipitation of CaCO, when aqueous solution of Nad0s and Caci : are mixed is- 29 a. 2Na" (aq) + CO'. (aq) Nai co, (aq) b. 2Na (aq)+2CI (aq) 2NaCI (aq) c. Na' (a) +Cl (aq)-NaCI (aq) d. Ca (aq)+CO(a) CaCO, (s) e. Na,CO, (ag)+CaCl: (a)- 2NaCI (aq)+ CaCO, (s) 30) When aqueous solutions of ÁgNO, and KI are mixed, Agt precipitates. The balanced net ionic a. Ag' (aq)+I (a)- Agl (s) b. Ag'(ag)+NO (ag)-AgNO, () Which of the following is an oxidation- reduction reaction? 31 a. Cu (s)+ 2AgNO, (aq) 2Ag (s)+Cu (NO,) (aq) b. HCl (aq) +NaOH (aq) H20 (1) NaCI (aq) c. AgNO, (aq) + HCl (aq) AgCl (s) + HNO, (aa) d. Ba(C2H3O2)2 (aq) + Na,so. (aq) Baso, (s) + 2NaCHO, (aq) H2COs (aq) + Ca(NOJ2 (aq)-. 2HNOj (aq) + CaCO, (s) e. 32 Which of the following reactions will not occur as written? a. Zn (s)+ Pb(NO,)2 (aq) Pb (s) + Zn(NOs)2 (aq) b. Mg (s) + Ca(OH)2 (aq)-* Ca (s) + Mg(OH)2 (aq) c. Sn (s) + 2AgNO, (aq) 2Ag (s) + Sn(NO,)2 (aq) d. Co (s) + 2AgCl (aq) 2Ag (s) + CoCl2 (aq) e. Co (s) + 2H1 (aq) H2 (g) + Coh(aq) Which one of the following is a correctexpression for molarity? a. mol solute/L solvent b. mol solute/mL solvent c. mmol solute/mL solution d. mol solute/kg solvent e. micromol solute/L solution

Explanation / Answer

29.The answer is D

Na2CO3(aq) + CaCl2(aq) -------------- CaCO3(s) + 2 NaCl(aq)

2 Na+(aq) + CO3-2(aq) + Ca+2(aq) + 2 Cl-(aq) --------------- CaCO3(s) + 2 Na+(aq) + 2 Cl-(aq)

Ca+2(aq) + CO3-2(aq) ------------------ CaCO3(s)

30)The answer is A

AgNO3(aq) + KI(aq) --------------- AgI(s) + KNO3(aq)]

Ag+(aq) + NO3-(aq) + K+(aq) + I-(aq) -------------- AgI(s) + K+(aq) + NO3-(aq)

Ag+(aq) + I-(aq) ---------------- AgI(s)

31) The answer is A

Cu(s)   + 2 AgNO3(aq) ------------------ Cu(NO3)2(aq)   + 2 Ag(s)

0            +1                                   +2                         0

Cu atom is undergoes oxidation and Ag is undergoes reduction. so it is oxidation-redcution reaction.

32) The answer is B

Mg is below element in the activity series than Ca.

so it is not possibel

33)The answer is C

Molarity = number of moles solute/volume of solution inL

Molarity = number of milli moles of solute/ml of solution

28. The answer is D.

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