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Nernst?s equation



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Q1. A zinc rod dipped in n molar solution of ZnSO4 has an electrode potential of -0.56 V. The salt is 98 percent dissociated at room temperature. What is the molarity of the solution? (E?(Zn+2/Zn) = -0.5 V)

(a) 8.44 ? 10-3 M
(b) 9.44 ? 10-4 M
(c) 8.44 ? 10-4 M
(d) 9.44 ? 10-3 M

Q2. Pt, Cl2(2 bar)| 2Cl?(0.02 M); E?(Cl2 | 2Cl?) = 3.4 V

(a)
(b)
(c) Both acidolysis and aldehyde
(d) None of the mentioned

Q3. Calculate the electrode potential of the given electrode.

(a) 3.51 V
(b) 3.55 V
(c) 1.26 V
(d) 2.95 V

Q4. The e.m.f and the standard e.m.f of a cell in the following reaction is 5 V and 5.06 V at room temperature, Ni(s) + 2Ag+(n) ? Ni2+(0.02M) + 2Ag(s). What is the concentration of Ag+ ions?

(a) 0.0125 M
(b) 0.0314 M
(c) 0.0625 M
(d) 0.0174 M

Q5. What is the correct Nernst equation for M2+ (aq) + 2e+ ? M (s) at 45?C?

(a) E?(M2+/M) + 0.315log10 (1 / [M]+2)
(b) E? (M2+/M) + 0.0425log10 (1 / [M]+2)
(c) E? (M2+/M) + 0.0315log10 (1 / [M]+2)
(d) E? (M2+/M) + 0.0326log10 (1 / [M]+2)

Q6. The equilibrium constant for a cell reaction, Cu(g) + 2Ag+(aq) ? Cu2+(aq) + 2Ag (s) is 4 ? 1016. Find E? (cell) for the cell reaction.

(a) 0.63 V
(b) 0.49 V
(c) 1.23 V
(d) 3.24 V

Q7. Calculate the e.m.f. of the half-cell given below.

(a) 4 V
(b) 5.6 V
(c) 3.4 V
(d) 5.4 V

Q8. Calculate the equilibrium constant for the reaction Fe + CuSO4 ? FeSO4 + Cu at 25?C.

(a) 3.46 ? 1030
(b) 3.46 ? 1026
(c) 3.22 ? 1030
(d) 3.22 ? 1026

Q9. The standard oxidation potential of Ni/Ni2+ electrode is 0.3 V. If this is combined with a hydrogen electrode in acid solution, at what pH of the solution with the measured e.m.f. be zero at 25?C? (Assume [Ni2+] = 1M)

(a) 5.08
(b) 4
(c) 4.5
(d) 5.25


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803 views

Assertion : Gases Combine In Simple Ratio Of Their Volume But, Not Always. Reason : Gases Deviate From Ideal Behaviour.

Modified 242 Year Ago

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242 Year Ago

Assertion : Gases Combine In Simple Ratio Of Their Volume But, Not Always. Reason : Gases Deviate From Ideal Behaviour.

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0 Answer
751 views

A Sample Of Phosphorus Trichloride (PCL3) Contains 1.4 Moles Of The Substance. How Many Atoms Are There In Atoms Sample

Modified 243 Year Ago Sangeeta

751
Sangeeta
243 Year Ago

A Sample Of Phosphorus Trichloride (PCL3) Contains 1.4 Moles Of The Substance. How Many Atoms Are There In Atoms Sample

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0 Answer
632 views

The Significant Figures In 34.00 Are

Modified 242 Year Ago Sangeeta

632
Sangeeta
242 Year Ago

The Significant Figures In 34.00 Are

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0 Answer
478 views

The Passege Of Current Liberates H2 At Cathode And CL2 At Anode. The Solution Is

Modified 236 Year Ago

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236 Year Ago

The Passege Of Current Liberates H2 At Cathode And CL2 At Anode. The Solution Is

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0 Answer
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Assertion : Atoms Can Neither Be Created Nor Destroyed. Reason : Under Similar Condition Of Temperature And Pressure, Equal Volume Of Gases Does Not Contain Equal Number Of Atoms.

Modified 242 Year Ago

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464
242 Year Ago

Assertion : Atoms Can Neither Be Created Nor Destroyed. Reason : Under Similar Condition Of Temperature And Pressure, Equal Volume Of Gases Does Not Contain Equal Number Of Atoms.

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0 Answer
398 views

Assertion : A Certain Element X, Forms Three Binary Compounds With Chlorine Containing 59.68%, 68.95% And 74.75% Chlorine Respectively. Reason : According To Law Of Multiple Proportions, The Relative

Modified 242 Year Ago

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242 Year Ago

Assertion : A Certain Element X, Forms Three Binary Compounds With Chlorine Containing 59.68%, 68.95% And 74.75% Chlorine Respectively. Reason : According To Law Of Multiple Proportions, The Relative

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0 Answer
396 views

In Br3O8 Compound, Oxidation Number Of Bromine Is

Modified 4 Year Ago

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4 Year Ago

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