Which of the following statements are true? For statements a) through d) use the
ID: 688568 • Letter: W
Question
Which of the following statements are true?For statements a) through d) use the reaction:
SiCl4 (l) + 2 Mg (s) 2 MgCl2 (s) + Si(s)
a) Mg is the reducing agent
b) SiCl4 is the reducing agent.
c) Mg is reduced
d) SiCl4 (or Si in SiCl4) is reduced.
e) HCl (g) + NH3 (g) NH4Cl (s)is aredox reaction
f) 2 CuCl(aq) CuCl2 (aq) + Cu (s)is a redoxreaction
Explanation / Answer
Assign oxidation numbers +4 -1 0 +2 -1 0 SiCl4 (l) + 2 Mg (s) 2 MgCl2 (s) + Si(s) Cl is neither oxidized nor reduced Si is being reduced (+4 -->0), SiCl4 is the oxidizing agent Mg is being oxidized (0 --> +2), Mg is the reducingagent True statements are A, D, E (use oxidation numbers to figure out,similar to above) F doesn't make sense because an ion cannot reduce an ion of thesame element. The electrons must flow from an element that is astronger reducing agent