20) Identify the location of reduction in an electrochemical cell.A) the socketB) the salt bridgeC) the anodeD) the electrodeE) the cathode21) The value of AG° at 141.0°C for the formation of phosphorous trichloride from its constituentelements,P2 (g) + Cl2 (g) 2PC13 (g)iskJ/mol. At 25.0°C for this reaction, AH° is -720.5 kJ/mol, AG° is -642.9 kJ/mol, andAS is -263.7 J/K.A) -829.7B) 3.65 x 104C) -612.3D) 1.08 × 10522) Phosphorous and chlorine gases combine to produce phosphorous trichloride:P2 (g) + 3Cl2 (g)2PC13 (g)E) -683.3AG° at K for this reaction -642.9 kJ/mol. The value of AG at 298 for a reaction mixture thatconsists of 1.5 atm P2, 1.6 atm Cl2, and 0.65 atm PCl3 isA) -649.5B) -3.88 × 103C) -7.28 × 103D) -708.4E) -44.2

20) An electrochemical cell is a device which is capable of either generating electrical energy from chemical reactions or using electrical energy to cause chemical reactions. "Since you have asked multiple questions, we will solve the first question for you. If you want any specific question to be solved then please specify the question number or post only that question.”A)The sockets : Electrical sockets allow us to plug in appliances to attach them and provide power for them to run. So the reduction in electro chemical cells doesn't take place at Socket. Hence, option A is incorrect. B) Salt bridge: A salt bridge is a device used to connect the oxidation and reduction half-cells of electrochemical cell. It maintains electrical neutrality. So the reduction in electro chemical cells doesn't take place at Salt bridge. Hence, option B is incorrect. C) Anode: It is the point where an oxidation reaction occurs in electro chemical cell. At anode, negative ions or anions due to its electrical potential tend to react and give off electrons and becomes neutral. At anode, Bn- -------> B + ne- So the reduction in electro chemical cells doesn't take place at Anode. Hence, option C is incorrect. D)Electrode: Electrodes are defined as conductors that are used to make electrical contact with electrolyte. So the reduction in electro chemical cells doesn't take place at Electrode. Hence, option D is incorrect. E) Cathode: It is the location where reduction reaction occurs in electro chemical cell. At cathode, positive ions or cations due to its electrical potential tend to react and gains electrons and becomes neutral. At cathode, An+ + ne- -------> A So the reduction in electro chemical cells takes place at cathode. Hence, option E is correct.