Which of the following equations represent
redox reactions? For each redox reaction,
determine which atom is oxidized and which
is reduced, and identify the oxidizing agent
and the reducing agent.
a. MgO(s) + H2CO3(aq) →
MgCO3(s) + H2O(l)
b.2KNO3(s)→2KNO2 (s) + O2(8)
c. H2(g) + CuO(s) → Cu(s) + H2O(1)
d. NaOH(aq) + HCl(aq) →
NaCl(aq) + H2O(1)
e. H2(8) + Cl2(g) → 2HCl(8)
f. SO3(g) + H2O(1)→ H2SO4(aq)

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°