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Electrochemistry

Short Answer Type

181. Write the Nernst equation and emf of the following cells at 298 k.
Mg(s) | Mg²⁺ (0.001 M) || Cu²⁺ (0.0001 M) | Cu(s)

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182. Write the Nernst equation and emf of the following cells at 298 k.
Fe(s) | Fe²⁺ (0.001 M) || H⁺ (1M) | H₂ (g) (1 bar) | Pt(s)

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183. Write the Nernst equation and emf of the following cells at 298 k.
Sn(s) | Sn²⁺ (0.050 M) || H⁺(0.020 M) H₂(g) (1bar) Pt (s)

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184. Write the Nernst equation and emf of the following cells at 298 k.
Pt(s) | Br₂ (l) | Br^– (0.010 M) || H⁺ (0.030 M) | + H₂(g) (1 bar) | Pt(s).

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185. What is corrosion? What are the factors which affect corrosion?

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186. CO₂ is always present in natural water. Explain its effect (increases, stops or no effect) on rusting of iron.

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187. Rusting of iron is quicker in saline water than in ordinary water. Explain.

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188. We can use aluminium in place of zinc for cathodic protection of rusting. Comment.

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189. How is cathodic protection of Iron different from its galvanisation?

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Long Answer Type

190. Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variaion with concentration.

Conductivity: The reciprocal of resistance of an electrolyte in aqueous solution is known as its conductivity. It is equal to

1 over straight R.

Molar Conductivity: Molar conductivity of a solution is defined as the conductance of all ions present in one mole of electrolyte in the solution. If M is the molar concentration in mol L^–1, then.
Conductivity: The reciprocal of resistance of an electrolyte in aqueo

Conductivity: The reciprocal of resistance of an electrolyte in aqueo

Fig: Molar conductivity versus C^1/2 for acetic acid (week electrolyte) and potassium chloride (strong electrolyte in aqueous solutions)
The curve shown below gives the change in conductance against square root of concentrations. We observe that for strong electrolytes like KCl, the conductance does not change much with decrease in

square root of straight C semicolon

whereas in the case of weak electrolyte like acetic acid (CH₃COOH) it increases much with decrease in

square root of straight C.

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