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Syllabus

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

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?

what is debye huckel onsagers equation?

what is salt bridge?

explain its function?

Q. A solution contains Fe

^{2}^{+}. Fe^{3}^{+}and I^{–}ions. This solution was treated with iodine at 35$\xb0$C. E$\xb0$ for Fe^{3}^{+}/ Fe^{2}^{+}is + 0.77 V and E$\xb0$ for I_{2}/2 I^{- }= 0.536 V. The favourable redox reaction is –(1) Fe

^{2}^{+}will be oxidised to Fe^{3}^{+}(2) I_{2}_{ }will be reduced to I^{–}(3) There will be no redox reaction (4) I–will be oxidised to I

_{2}Calculate the potential of hydrogen electrode in contact with a solution whose pH is 10.

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

5. If V, in the equation A=sp, cond, x V, is the volume in CC containing 1 eq. of the electrolyte : V for a $\frac{N}{10}$ solution will be:

(1) 10 c.c. (2) 100 c.c. (3) 1000 c.c. (4) 10,000 c.c.

Why does a dry cell become dead after a long time even if it has not been used?

Q. If the standard electrode potential of $C{u}^{2+}$/Cu electrode is 0.34 V, what is the electrode potential of 0.1 M concentration of $C{u}^{2+}$?

(1) 3.99 V

(2) 0.3105 V

(3) 0.222 V

(4) 0.176 V

what is discharge potential ?

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.

? ?CaCO?3(s)????CaO(s) + CO?2(g)?

? ? ?K?p?= 1.16 at 1073 K then per cent dissociation of CaCO?3?is??

? ?(1) Zero? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?(2) 6.58%?

? ?(3) 65%? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?(4) 100%

what is the difference between E cell and E

^{0 cell??}what is redox couple(1) 1 L atm

(2) 5 L atm

(3) 500 L atm

(4) 50 L atm

why does mercury cell give a constant voltage throughout its life?

^{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}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?

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

^{–6 }mho cm^{–1}. Find the solubility product of AgCl at 25°C.$\left({\mathrm{\lambda}}_{\mathrm{AgCl}}^{\infty}=138.3\mathrm{mho}{\mathrm{cm}}^{2}\right)$

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}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 electrodesWhat is the factors affecting electrode potential ?

how many electrons would be required to deposit 6.35 g of copper at the cathode during electrolysis of an aqeous solution of copper sulphate?

construction working and uses of daniell cell

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

What is the difference between galvanic cell & daniel cell?

A + B → C + D ; E° = x volt, ΔG = ΔG

_{1}2A + 2B → 2C + 2D ; E° = y volt, ΔG = ΔG

_{2}Then,

(1) x = y, ΔG

_{1}= ΔG_{2}(2) x > y, ΔG

_{1}> ΔG_{2}(3) x = y, ΔG

_{2}= 2ΔG_{1}(4) x < y, 2ΔG

_{2}= ΔG_{1}What are metallic conductors and electrolytic conductors?plz give examples also

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.

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.???

1): 0.005

2):0.043

3):0.01

4):0.02

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?

Pt; h2(g) / h+(10 with -8 as power) M // h+(0.001M) / 1/2 h2(g). Pt;

1)-0.295 v. 2)-0.0591v

3)0.295v. 4)0.0591v

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

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.ion. pH of solution become $({K}_{a}=1.8\times {10}^{-5})$

(1) 3.5

(2) 1

(3) 0.7

(4) 4

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

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

(1) 1.59g (2) 3.18g

(3) 6.35g (4) 12.70g

(1) 22.4 L

(2) 11.2 L

(3) 33.6 L

(4) 44.8 L

state two advantages of (H

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

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

I) Ca

ii)Cu

iii)Cr

iv)Ag

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

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.

_{4}in aqueous sulphuric acid is a method for preparation of MnO2. Passing a current of 27A for 24 hrs gives 1 kg of MnO2. The current efficiency of this process isWhy mercury does not form amalgam with Iron?

what is the difference between INERT ELECTRODE and ACTIVE ELECTRODE? how to identify one whether it is inert or active ???

^{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 Vinto NO2

, (1 + ?) values

with the vapour densities ratio ?

?

?

?

?

?

d

D

is as given by

:

[?-degree of dissociation, D-vapour density before

dissociation, d-vapour density after dissociation]

^m at infinte for Al2(SO4)3 = 858 cm2mol-1.

^m at infinite for NH4OH = 238.3 S cm2 mol-1

^m at infinity for (NH4)2SO4= 238.4 S cm2 mol-1.. Calculate ^m infinite for Al(OH)3

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

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

$\mathbf{36}\mathbf{.}\mathbf{}\mathbf{}Attheequilibriumofthereaction,{N}_{2}{O}_{4}\rightleftharpoons 2N{O}_{2}\left(g\right),theobservedmolarmassof{N}_{2}{O}_{4}is77.70gmo{l}^{-1}.Thepercentagedissociationof{N}_{2}{O}_{4}is$

(1) 28.4 (2) 46.7 (3) 22.4 (4) 18.4

Q1. A gas absorbs 250 J of heat and expands from 1 litre to 10 litre at constant temperature against external pressure of 0.5 atm. The value of q.w and $\u2206$E will be respectively.

a. 250 J, 455 J , 710 J b. 250 J, – 455 J, –205 J

c. –250 J, – 455 J, – 205 J d. – 250 J, 455 J, 205 J