Electrochemical cells

What is the ratio of moles formed at each cathode (negative electrode)?

• A

• B

• C

• D

Which factor affect the amount of product formed at the cathode during electrolysis of molten salt?

I. current

II. time

III. charge on the cation

• A. I and II

• B. I and III only

• C. II and III only

• I,II and III

What are the products when concentrated KBr (aq) is electrolyzed?

• A

• B

• C

• D

Which is correct for a redox reaction where the standard electrode potential is negative?

∆G^ꝋ =-nFE^ꝋ and ∆G^ꝋ = -RTln K

• ∆G^ꝋ is negative and K is less than 1

• ∆G^ꝋ is negative and K is greater than 1

• ∆G^ꝋ is positive and K is less than 1

• ∆G^ꝋ is positive and K is greater than 1

What are the products of electrolysis when concentrated calcium bromide solution is electrolysed using graphite electrodes?

• A

• B

• C

• D

Which combination would electroplate an object with copper?

• A

• B

• C

• D

In the electrolysis of aqueous potassium nitrate, KNO_{3, using inert electrodes, 0.1 mol of a gas was formed at the cathode (negative electrode).}

_{Which is correct?}

• A

• B

• C

• D

What does not affect the mass of products formed in electrolysis of an aqueous solution?

• Current

• Duration of electrolysis

• Initial mass of cathode

• Charge on the ions

If ℵg of silver are deposited in cell 1, what volume of oxygen, in dm³ at STP, is given off in cell 2?

Ar(Ag) =108; Molar

volume of an ideal gas at STP= 22.7 dm³ mol^-1

• ℵ⁄108 x ¼ x 22.7

• ℵ⁄108 x 4 x 22.7

• ℵ⁄108 x ½ x 22.7

• ℵ⁄108 x 2 x 22.7