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WorksheetsRedOx Reactions
Total questions: 10
Worksheet time: 9mins
E0 values of some redox couples are given below. On the basis of these values choose the correct option.
E0 values: Br/Br- = + 1.90; Ag+/Ag(s)=0.80 Cu2+/Cu(s) = + 0.34; I2 (s)/I– =+0.54
Cu will reduce Br-
Cu will reduce Ag
Cu will reduce I-
Cu will reduce Br2
identify the oxidizing agent in the reaction?
4NH3 + 3O2 (g) → 2N2 (g) + 6H2O (g)
(a)
What is the reducing agent in the reaction?
Fe2O3 (s) + 3CO (g) -----→ 2Fe (s) + 3CO2 (g)
(a)
What is reduction half cell reaction for the given equation
Fe2+ + H+ + Cr2O72– ----→ Cr3+ + Fe3+ + H2O
(a)
In which substance does sulfur have a negative oxidation number?
CaSO4
S
SO2
Na2S
Calculate the standard cell emf for the following cell:
Mg |Mg2+ || NO3- (acid soln)| NO(g) | Pt
Note: include units in the answer
(a)
Which of the following species is the strongest oxidizing agent under standard-state conditions?
Ag+(aq)
H2(g)
H+(aq)
Cl2(g)
Al3+(aq)
For the reaction Ni2+(aq) + 2Fe2+(aq) ® Ni(s) + 2Fe3+(aq), What is the standard cell potential E°cell ?
Note: please include the unit in your answer.
(a)
Which statement is true for a spontaneous redox reaction carried out at standard-state conditions?
E°red is always negative.
E°cell is always positive.
E°ox is always positive.
E°red is always positive.
For the electrochemical cell Ni(s) | Ni2+(1 M) || H+(1 M) | H2(1 atm) | Pt(s), which one of the following changes will cause a decrease in the cell voltage?
Increase the pressure of H2 to 2.0 atm .
Decrease the mass of the nickel electrode.
Lower the pH of the cell electrolyte.
Decrease the concentration of Ni2+ ion
none of these
