Question

Part A. Which of the following is not a redox reaction?

H2O(l) + NH3(g)    $LaTeX: \longrightarrow$ NH4+(aq) + OH–(aq)

2H2(g) + O2(g) $LaTeX: \longrightarrow$ 2H2O(l)

Zn(s) + H2SO4(aq) $LaTeX: \longrightarrow$ ZnSO4(aq) + H2(g)

FeSO4(aq) + K2Cr2O7(aq) + 7H2SO4(aq) $LaTeX: \longrightarrow$ Cr2(SO4)3(aq) + 3Fe2(SO4)3(aq) + K2SO4(aq) + 7H2O(l)

Cl2(g) + 2KBr(aq) $LaTeX: \longrightarrow$ Br2(l) + 2KCl(aq) Part B. A 43.46 mL sample of Na2SO3 was titrated with 68.99 mL of 0.128 M K2Cr2O7 solution in the presence of H2SO4. Calculate the molarity of the Na2SO3 solution. Enter to 3 decimal places. 3 SO32− + Cr2O72− + 8H+   $LaTeX: \longrightarrow$ ⟶ 3 SO42− + 2 Cr3+ + 4 H2O

Answer 1