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Syllabus

Define cell constant. How is it related to conductivity.?

Explain why zinc dissolved in dilute HCl to liberate hydrogen gas but from concentrated H2SO4 the gas evolved is SO2?

what is debye huckel onsagers equation?

Cu does not dissolve in HCl but dissolves in nitric acid. Explain why?

what is salt bridge?

explain its function?

Q.104. The covalent and van der Waal's radii of hydrogen respectively are

(1) 0.37 Å, 0.8 Å

(2) 0.37 Å, 0.37 Å

(3) 0.8 Å, 0.8 Å

(4) 0.8 Å, 0.37 Å

limitations of standard hydrogen electrode

Calculate the potential of hydrogen electrode in contact with a solution whose pH is 10.

The molar conductivities at infinite dilution for NaI, CH

_{3}COONa and (CH_{3}COO)_{2}Mg are 12.69, 9.10 and 18.78 S m² mol^{−1}. What is Λ_{°m}for MgI_{2 }?Why does a dry cell become dead after a long time even if it has not been used?

When a conductivity cell was filled with 0.02 M KCl, it had a resistance of 82.4 ohm at 250C and when filled with 0.005 N K2SO4, it had a resistance of 326 ohm. Calculate :

(i) Cell constant(ii) Specific conductivity(iii) Equivalent conductivity of 0.005 N K2SO4 soln.The specific conductance of 0.02 M KCl is = 0.002768 ohm1 cm1.what is discharge potential ?

the blue colour of CuSO

_{4}solutions is slowly discharged when a rod of zinc is dipped in it . explain..The products of electrolysis of molten NaCl are Na metal and Cl

_{2}gas, while the products of electrolysis of aqueous solution of NaCl are NaOH, Cl_{2}and H_{2}.Please explain this in detail with the appropriate reactions.

At 298 K, molar conductivities at infinite dilution of NH

129.8, 217.4 and 108.9 ohm_{4}Cl, NaOH and NaCl are^{-1}cm^{2}respectively. If molar conductivity ofcentinormal solution of NH4OH is 9.33 ohm-1 cm2, what is the degree ofdissociation if NH_{4}OH solution?what is the difference between E cell and E

^{0 cell??}Write the Nernst equation and calculate the emf of the following cell at 298 K.

Cu (s) / Cu

^{++ }( 0.130 M) // Ag^{+ }( 1.0× 10^{-4 }M) / Ag (s) given : E Cu++ / Cu = 0.34V and E Ag+/Ag = 0.80V^{–6 }mho cm^{–1}. Find the solubility product of AgCl at 25°C.$\left({\mathrm{\lambda}}_{\mathrm{AgCl}}^{\infty}=138.3\mathrm{mho}{\mathrm{cm}}^{2}\right)$

Q. An equilibrium mixture of the reaction , 2NO(g) + O

_{2}(g) $\underset{}{\rightleftharpoons}$ 2NO_{2}(g) contains 0.120 mole of NO_{2}, 0.0080 mole of NO and 0.640 mole of O_{2}in a 4 litre flask at constant temperature. The value of K_{c }for the reaction at this temperature is(1) 14 (2) 24

(3) 7 (4) 28

what is redox couplewhy does mercury cell give a constant voltage throughout its life?

- Mg
- Ag

The emf of the cell is 2.96 V at [Mg_{(s)}| Mg^{2+}_{(aq) }_{(s) }| Ag^{+}(aq)^{2+}] = 0.130 M and [Ag^{+}] = 1.0 * 10^{-4}M. Calculate the standard emg of the cell ( R = 8.3 JK^{-1}mol^{-1 }, F = 96500 C )I am asking this question 2nd time soo plzz give me the answer this time.

Here are a list of q'z pls ans. them briefly

q1)The number of faradays required to deposit 1g equivalent of alumininium(at wt.27)from a soln of AlCl3 is-

q2)What is the electrochemical equivalent of Cu in the rxn-

Cu2++2e---------Cu

q3)The specifc conductance of saturated soln of CaF2 is 3.86*10(power -15) and that of water used for solution is 0.15*10(power -5).What is the specific conductance of CaF2 alone?

q4)What is the molar conductivity "^". If resistivity is 'x' for 0.1 N H2SO4 solution?

q5)The conductivities at infinite dilution of NH4CL,NAOH and NaCl are 130,218,120.If equivalent conductance of N/100 soln of NH4OH is 10,degree of disociation of NH4OH at this dilution is-

q6)The resistance of a N/10 KCL aq. soln is 245 ohms.If the electrodes in the cell are 4cm apart and area having 7 cm sq. each,the molar conductance of the soln will be?

Assertion: E

_{cell }should have positive value for the cell to function.Reason: E

_{cathode}< E_{anode .}4/3 Al+O

_{2}gives out 2/3 Al_{2}O_{3.}Find the minimum emf required to carry out the electrolysis of Al_{2}O_{3.}delta G=-827kJ per mol of O

_{2}.130-log of[.0001]???^{2}other than

learn this

log 10=1 log 100=2 log 1000=3 and so on.

now,coming to your question,

log 0.130 is same as log 130/1000.

log 130/1000 = log 130 - log 1000

= 2.113 - 3

= -0.8860.

Molar conductivity at infinite dilution for NH4Cl, NaOH and NaCl solution at 298K are respectively 129.8, 218.4 and 108.9 Scm2 mol-1 and ^m for 10-2 M solution of NH4OH is 9.33 Scm2 mol-1. Calculate the degree of dissociation of NH4OH

Predict the products of electrolysis in each of the folloiwng:

(i) An aqueous solution of AgNO3 with silver electrodes.(ii) An aqueous solution of AgNO3 with plantinum electrodes.(iii) A dilute solution of H2SO4 with platinum electrodescalculate equilibrium constant for reaction at 298 k.zn+cu2+gives zn2+ +cu given that Eo zn2+/zn=0.76v Eo cu2+/cu + 0.34v.

What is the factors affecting electrode potential ?

Calculate the potential of the half cell containing 0.10M K2Cr2O7, 0.20M Cr+2, and 1.0* 10-4M H+. The half cell reaction is

Cr

_{2}O_{7}^{-2}+14 H^{+}+ 6e^{-}--------------- 2Cr^{+3}+7 H_{2}0The standard electrode potential is given as 1.33V.???

^{3}) C is measured at 20^{0}C. The slope of a plot of $\mathrm{\pi}$ against C is found to be 4.65 x 10^{-3}. The molecular weight of the insulin is(A) 3 x 10

^{5}(B) 9 x 10^{5}(C) 4.5 x 10^{5}(D) 5.16 x 10^{5}The emf of the cell Zn|Zn2+(0.1 M)||Cd2+(M1)|Cd has been found to be 0.3305 V at 298 K.

construction working and uses of daniell cell

a voltaic cell is set up at 25degree celcius with the half cellsAg+ (0.001M) I Ag and Cu 2+(0.10M) I Cuwhat should be its cell potential?

Q. Explain the Molar Conductivity with weak and strong electrolytes ?

a) 0.08 M soln. having conductivity equal to 2*10^-2 ohm^-1 cm^-1

b) 0.10 M soln. having resistivity equal to 5.8 ohm cm

What are metallic conductors and electrolytic conductors?plz give examples also

What is the difference between galvanic cell & daniel cell?

calculate the limiting molar conductivity of CaSO4.given(molar conductivity of calcium-119.0 Scm square per mol and molar conductivity of sulphate 160.0 S cm square per mol

1. 1 : 2 : 3 2. 3 : 2 : 1 3. 6 : 3 : 2 4. 3 : 4 : 2

^{+3}) by the following process$\mathrm{Ar}\underset{-\mathrm{r}}{\overset{{\mathrm{E}}_{1}}{\to}}{\mathrm{Ar}}^{+}\underset{-\mathrm{r}}{\overset{{\mathrm{E}}_{2}}{\to}}{\mathrm{Ar}}^{2+}\underset{-\mathrm{r}}{\overset{{\mathrm{E}}_{3}}{\to}}{\mathrm{Ar}}^{3+}$

The correct order of E

_{1}, E_{2}and E_{3}_{ }energies is(1) E

_{1}< E_{2}< E_{3}_{ }(2) E_{1}> E_{2}> E_{3 }(3) E_{1}= E_{2}= E_{3 }(4) E_{1}> E_{2}< E_{3}Rate constant, K for first order reaction has been found to be 2.54*10 to the power -3 per sec. Calculate its three-fourth life.

How does electrochemical series help us in predicting whether a redox reaction is feasible in a given direction or not.

for the reaction 3A(g)+B(g)=2C(g) at a given temperature,Kc=9.0 . what must be the volume of the flask, if a mixture of 2.0 mole each of A,B and C exist in equilibrium?

How to draw the resonating structures of H2SO4 and H2SO5 ???

As per electrochemical series and on the basis of electrode potential values, identify the following:

(a) gas which has highest tendency for reduction.

(b) weakest oxidising ion.

Silver is electrodeposited on a metallic vessel of surface area 800 cm2 by passing

current of 0.2 A for 3 hours. Calculate the thickness of silver deposited.can chlorine gas be stored in copper cylinder ? given electrode potential for(Cu2+/Cu)= 0.34V and electode potential for (Cl2/Cl-)=1.36V

What are the major topics of electrochemistry that can be asked in Chemistry Board Exam..

I mean.. right now it is no point studying this chapter from scratch.. there is?

What all should be studied in Electrochemistry for Chemistry Board?

why is alternating current used instead of direct current in measuring electrolytic conduction ?

calculate the equivalent conductance of 1 M h2so4 solution if its conductivity is 2.6x10 to the power -2 /ohm cm

The resistance of a conductivity cell containing 0.001M KCl solution is 1500 ohm. What is the cell constant if conductivity of the solution at 298K is 0.000146 S/cm.

give a test to distinguish b/w ethylamine and aniline ?

calculate the strength of current required to deposit 1.2 gm of magnesium from molten mgcl2 in 1 hr

The metals that cannot be obtained by electrolysis of an aqueous solution of its salt is:

I) Ca

ii)Cu

iii)Cr

iv)Ag

state two advantages of (H

O_{2}_{2}) fuel cell over ordinary cell.answer it fastly!!!!!

19. A highly concentrated solution potassium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively.

$\left(a\right){H}_{},{O}_{2}\left(b\right){O}_{2},{H}_{2}\left(c\right){O}_{2},Na\left(d\right){H}_{2},{S}_{2}{O}_{8}^{-2}$

Q19

a voltanic cell is set up in 25 degre c Al|Al3+(0.001M) and Ni| Ni2+(0.50M) calculate cell voltage

ans -1.46v

what is nickel- cadmium cell?state its merit and demerit over lead storage cell.a)write the overall reaction that occurs during discharge of thhe cell.

^{2}^{+}/ Fe) = -0.44 V ] to prevent corrosion and why ?Given E° (A

^{2}^{+ }/ A) = -2.37 V and E° (B^{2+ }/ B ) = -0.14 V_{2}SO_{4}:_{4}solution is connected in series ?^{o}_{Zn2}_{+/Zn}= -0.76 V.a) -0.90 V

b) -0.75 V

c) -0.85 V

d) -0.65 V

Why mercury does not form amalgam with Iron?

_{2}(aq)(0.1M) // AgCl(s) / Ag(s) in which reaction is 0.6195V at 0 degree Celsius and 0.6753V at 25 degree Celsius. the value of deltaH of the reaction at 25 degree Celsius is^{-1}cm^{2}/ mol. At the same temperature, but at a concentration of 1 mole in 1000 litres, it is 55 ohm^{-1 }cm^{2}/ mol. what is the percentage dissociation of acetic acid?