Presentation on theme: "CHEMISTRY DEPARTMENT WAID ACADEMY Redox and Faraday."— Presentation transcript:
CHEMISTRY DEPARTMENT WAID ACADEMY Redox and Faraday
A solution of nickel(II) sulphate is electrolysed using nickel electrodes. The passage of 96500 coulombs results in 1.the negative electrode gaining 29.5 g 2.the positive electrode gaining 29.5 g 3.the negative electrode gaining 59 g 4.the positive electrode gaining 59 g 60 Seconds Remaining
What mass of copper metal, in grams, would be deposited by electrolysis of a solution of Cu 2+ (aq) ions if ½ Faraday of electrical energy were passed? 1.63.5 g 2.31.75 g 3.15.875g 4.7.95g 60 Seconds Remaining
In which of the following would a displacement reaction take place? 60 Seconds Remaining 1.Bubbling chlorine gas through an aqueous solution of sodium fluoride. 2.Adding bromine solution to an aqueous solution of sodium chloride. 3.Adding bromine solution to an aqueous solution of sodium fluoride. 4.Bubbling chlorine gas through an aqueous solution of sodium iodide.
If 96 500 coulombs of electrical charge are passed through separate solutions of copper(II) chloride and nickel(II) chloride, then 1.equal masses of copper and nickel will be deposited. 2.the same number of atoms of each metal will be deposited. 3.the metals will be plated on the positive electrode. 4.different numbers of moles of each metal will be deposited. 60 Seconds Remaining
During a redox reaction in acid solution, iodate ions, IO 3 - (aq) are converted into iodine, I 2 aq). IO 3 - I 2 The number of H + (aq)and H 2 O(l) required to balance the ion-electron equation for the formation of 1 mole of iodine are, respectively. 1.6 and 3 2.3 and 6 3.12 and 6 4.6 and 12 60 Seconds Remaining
Which of the following is a redox reaction? 1.A 2.B 3.C 4.D 60 Seconds Remaining
How many moles of iodide ions are oxidised by one mole of permanganate ions? 1.1 ½ 2.2 3.2 ½ 4.5 60 Seconds Remaining
What is the quantity of electricity needed to produce 0.25 moles of copper? 1.24 125 C 2.48 250 C 3.96 500 C 4.193 000C 60 Seconds Remaining
In which of the following reactions is hydrogen acting as an oxidising agent? 60 Seconds Remaining 1.H 2 + C 2 H 4 C 2 H 6 2.H 2 + Cl 2 2HCl 3.H 2 + 2Na 2NaH 4.H 2 + CuO Cu + H 2 O
In a redox reaction 20 cm 3 of 0.02 mol l -1 acidified potassium permanganate solution was used. How many moles of permanganate ions were used? 1.0.4 mol 2.2.0 mol 3.0.0004 mol 4.0.002 mol 60 Seconds Remaining
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