Question

6. Based on the activity series, which single displacement reaction will not occur? Mg(s) + 2HCl(aq) - MgCl2 (aq) + H2(g) SnBr2 (aq) + Zn (s) --- ZnBrz (aq) + Sn (s) Mg(s) + ZnCl2 (aq) --- MgCl, (aq) + Zn (s) Zn (s) + 2HNO, (aq) + 2AGNO, (aq) + H2 (8) SnBrz (aq) + Cu(s) -- CuBr2 (aq) + Sn (s) Question 7 1 pts 7. Based on the definition of oxidation and reduction, which of the following is a redox reaction? Ba(C2H5O2)2 (aq) + Na2SO4 (aq) --BaSO4(s) + 2NaC H3O2(aq) H2CO3 (aq) + Ca(NO3)2 (aq) - 2HNO3(aq) +CaCO3s) HCl(aq) + NaOH(aq) --H20 (1) + NaCl(aq) Cu (s) + 2AGNO, (aq) + 2Ag (s) + Cu(NO3)2 (aq) AgNO3(aq) + HCl(aq) -- AgCl (s) + HNO, (aq)

Answer 1

6.Based on the activity series, A metal system which occurring above the given element, displaces the element from the aqueous solution containing its own ions. The single displacement reaction does not occur is

SnBr2(aq) + Cu(s)   -----> CuBr2(aq) + Sn(s)

7. A reaction in which both oxidation-reduction takes place simultaneously is called redox reaction.

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

8. The number of moles of Ca(NO3)2= molarity * volume = 2*0.3 = 0.60 moles

i. e. The solution contains 0.60 moles of Ca(NO3)2, 0.60 moles of Ca2+ ions and 1.20 moles of NO3- ions

       The solution contains 3.60 moles of O atoms , 1.20 moles of N atoms.

The number of Ca2+ ions present in the 2.0 solution are 0.60 *6.023*10²³ = 3.61 *10^23 ions

Therefore, the number of Ca2+ ions present in the 1.0 solution are 0.60 *6.023*10²³ /2= 1.805 *10^23 ions.

Incorrect statement : 1.0 of solution contains 3.61 *10^23 Ca2+ ions is wrong

10. According to dilution law,

M1V1=M2V2   ===> 9*V1 = 2.75*350 =======> V1 = 107 mL

The 107 mL of 9.0 M solution of MgCl2 must be diluted in order to get 350 mL of 2.75 M solution