12) Whichs Fe2S3 + 12h INO3 2FeN 013 + 35 . 6NO2 . 61120 A) Fe B)S C)N D) O E)H

Question

12) Whichs Fe2S3 + 12h INO3 2FeN 013 + 35 . 6NO2 . 61120 A) Fe B)S C)N D) O E)H 13) Which transformation could take place at the anode of an electrochemical cell? B) F2 to F C)02 to H20 D) HAsO2 to As E) None of the above could take place at the anode. the salt bridge in an electrochemical cell is 14) The purpose of A) maintain electrical neutrality in the half-cells via migration of lons B) provide a source of ions to react at the anode and cathode C) provide oxygen to facilitate oxidation at the anode D) provide a means for electrons to travel from the anode to the cathode E) provide a means for electrons to travel from the cathode to the anode 15) Which transformation could take place at the cathode of an electrochemical cell? A) MnO2 MnO4- B) Br2 BrO3. C) NO HNO3 D) HSO4 H2SO3 E) Mn2+ MnO4- 16) is the oxidizing agent in the reaction below 2Cr20,2 + 2S2Og2-+8H+ 4Cr3+ + 4S4062-+4H2O A) Cr B) S C)H+ E) none of the above 17) is the reducing agent in the reaction below.

Explanation / Answer

12)

oxidation state of Fe is +3 in Fe2S3 and +3 in Fe(NO3)3

oxidation state of S is -2 in Fe2S3 and 0 in S

oxidation state of N is +5 in HNO3 and +4 in NO2

So,

S is getting oxidised and N is getting reduced

So,

S is reducing agent and N is oxidising agent

Answer: C

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