What is the quantity of electricity (in Coulombs) required to deposit all the silverfrom 250 mL of 1 M AgNO3 solution
A. 2412.5
B. 24125
C. 4825.0
D. 48250
Which of the following is not correct
A. Aqueous solution of NaCl is an electrolyte
B. The units of electrochemical equivalent are g- Coulomb
C. In the Nernst equation, n represents the number of electrons transferredin the electrode reaction
D. Standard reduction potential of hydrogen electrode is zero volt
Calculate the emf of the cell Cu (s) | Cu2+ (aq) || Ag+ (aq) | Ag (s) GivenEoCu2+/Cu = +0.34V , EoAg+/Ag =0.80 V
A. +0.46 V
B. +1.14 V
C. +0.57 V
D. -0.46 V
The standard reduction potentials of Zn2- | Zn, Cu2+| Cu and Ag+| Cu and Ag+| Ag are respectively -0.76, 0.34 and 0.8 V. The following cells were constructed :1) Zn | Zn 2+||Cu 2+| Cu2) Zn | Zn 2+||Ag +| Ag3) Cu | Cu 2+||Ag +| Agwhat is the correct order of Eocell of these cells?
A. 2 > 3 > 1
B. 2 > 1 > 3
C. 1 > 2 > 3
D. 3 > 1 > 2
What is the time (in sec) required for depositing all the silver present in 125mL of 1 M AgN03 solution by passing a current of 241.25 A ? (1 F = 96500 coulombs)
A. 10
B. 50
C. 1000
D. 100
Assertion (A) : A current of 96.5 A is passed into aqueous AgNO3 solution for 100 s. The weight of silver deposited is 10.8 g (At. wt. of Ag = 108)Reason (R) : The mass of a substance deposited during the electrolysis of an electrolyte is inversely proportional to the quantity of electricity passing through the electrolyte.The correct answer is :
A. Both (A) and (R) are true and (R) is the correct explanation of (A)
B. Both (A) and (R) are true but (R) is not the correct explanation of (A)
C. (A) is true but (R) is false
D. (A) is false but (R) is true
When a copper wire is dipped in a aqueous AgNO3 solution, the solution turns blue,The reason for this is
A. Oxidation of silver
B. reduction of copper
C. oxidation of copper
D. reduction of silver
A system absorbs 10kJ of heat and does 4kJ of work. The internal energy of the system
A. Decreases by 6kJ
B. Increases by 6kJ
C. Decreases by 14kJ
D. Increases by 14kJ
In which of the following cases, the reaction is spontaneous at all temperatures
A. ΔG>0, ΔS>0
B. ΔH0
C. ΔH
D. ΔH>0, ΔS
A solution of concentration "C" g equiv/litre has a specific resistance R, The equivalent conductance of the solution is
A. R/C
B. C/R
C. 1000/RC
D. 1000R/C
The ΔG in the process of melting of ice at -150C and 1atm pressure is
A. ΔG is –Ve
B. ΔG is +Ve
C. ΔG=0
D. All of these
During the electrolysis of cyrolite,aluminium and fluorine are formed in.......molar ratio
A. 1:2
B. 2:3
C. 1:1
D. 1:3
When X amperes of current is passed through molten AlCl3 for 96.5 second,0.09g of alumunium is deposited.What is the value of X
A. 10 ampere
B. 20 ampere
C. 30 ampere
D. 40 ampere
Zn(s)+Cu+2(ag)→Cu(s)+Zn+2(ag)Given that ΔfG0 for Cu+2(ag) and Zn+2(ag) are +65.0 K.J.mol-1 and -147.2 K.J.mol-1 respectively then the standard Gibbs energy change for the above reaction is
A. 266.2 KJ
B. 111.2 KJ
C. -212.2 KJ
D. -82.2 KJ
The standard reduction electrode potential values of the elements A, B and C are +0.68V, -2.5V and -0.5V respectively. The order of their reducing power is
A. A>B>C
B. A>C>B
C. C>B>A
D. B>C>A
The cell reaction of a cell is Mg(g)+Cu2+(aq)→Cu(g)+Mg2+(aq).If the standard reduction potentials of magnesium and copper are -0.33 and +2.38V respectively,the e.m.f of the cell is:
A. +2.03V
B. -2.03V
C. +2.71V
D. -2.71V
E. deleted
The number of moles of electrons required to deposit 36 g of Al from an aqueous solution of Al(NO3)3 is (At. wt. of Al = 27)
A. 4
B. 2
C. 3
D. 1
On passing a current through a KCl solution, 19 5 g. of potassium is deposited. If the same quantity of electricity is passed through a solution of aluminium chloride, the amount of aluminium deposited is:
A. 4.5 g
B. 9.0 g
C. 13.5 g
D. 27 g