Ncert Solutions Chemistry Class 12th

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Ans: According to Faraday's second law of electrolysis, the amount of different substances liberated keeping the electricity flow same through the electrolytic solution is directly proportional to the equivalent weight.

$\frac{{\mathrm{\omega }}_1}{{\mathrm{\omega }}_2}$ = $\frac{{\mathrm{E}}_1}{{\mathrm{E}}_2}$

E₁and E₂ have different values. Therefore, the mass of copper and silver deposited will be different

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The concentration of the reactants does not change with time in a zero- order reaction, and the rate of concentration remains constant.

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Ans: At the stage of equilibrium E? _Cell =0. So according to the relation,

ΔrG =−nFEcell

ΔrG =−n*F*0

ΔrG =0

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Let order of reaction be = n

rate = k [A]ⁿ- (i)

27r = k [3A]ⁿ- (ii)

Divide (ii) by (i)

$\frac{27\mathbf{r}}{\mathbf{r}}$  =  $\frac{27\mathbf{r}}{\mathbf{r}}$   k [3A]nn

3ⁿ = 27

n = 3

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Ans: E? _Cell can never be zero. For a feasible reaction E? _Cell should be positive or ΔrG$°$should be negative and at the stage of equilibrium, both of these parameters are zero.

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The order and molecularity of elementary reactions are the same. As a result of a single collision between two molecules or ions, a complicated process occurs. A reaction mechanism is a set of elementary reactions.

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Ans:No, the difference in potentials of the electrodes is measured. A reference electrode is to be taken while measuring the electrode potential of the electrode.

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Experimentally, the reaction's rate law can be calculated.

Step 1

2NO (g) + O₂ (g)→2NO₂ (g)

O₂ (g) is taken in excess

x molecules of NO number reacting with excess of O₂

r = k [NO]^x

Step 2

2NO (g) + O₂ (g)→2NO₂ (g)

When 2No (g)is taken in excess

Y molecules of O₂ reacting with excess of [NO]

rate = k [O₂]^y

rate = k [NO]^x [NO]^y

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Ans: The relation between Gibbs free energy and the emf of the cell is as follows;

ΔG=−nFE_cell

 E $°$ _cell s the cell potential

is the standard emf of the cell

Maximum work obtained from the galvanic cell is nFE $°$ _.

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Given: Order of the reaction = 0

We know that a zero order reaction is a chemical reaction that occurs regardless of the reactant's concentration.

The rate law of 2A + B→C is

r = k [A]⁰ [B]⁰

For a zero- order reaction

r = k