Ncert Solutions Chemistry Class 12th

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Ans: When the opposing potential becomes equal to the electrical potential there is no current flowing in the cell and the cell reaction stops and there is no chemical reaction in the cell

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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. The molecularity of a reaction cannot be 0 because it indicates the number of reactants involved.

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Ans: Alternating current is used to stop electrolysis so that the concentration of the ions in the solution remains constant.

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Ans: The cell represented above shows an electrochemical cell in which two different electrodes are present and the cell at the bottom represents the electrolytic cell.

In this zinc is losing electrons moving towards electrode A and copper is accepting an electron from electrode B. Therefore, the polarity of electrode A is positive and electrode B is negative.

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When the Threshold energy is less than the energy of the molecules and the orientation of the molecules is proper for the effective collision, the reaction happens. As a result, the reaction is slow, and the number of effective collisions is reduced

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Ans: The potential difference between the metal and its solution is termed electrode potential.

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The number of ions or atoms that collide to react is known as molecularity in an elementary reaction. The order of reaction about B should be 1 if this is an elementary reaction, however the rate law given is $\frac{3}{2}$

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Ans: In the electrolysis process of sodium chloride, oxidation of water at anode requires more potential. So Cl− is oxidized at anode instead of water.

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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.

R= [R]₀ – Kt

Kt = [R]₀

t = $\frac{\left. [\mathrm{R}\right]{}_0}{\mathrm{K}}$

 

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Ans:  Galvanic cell consists of two electrodes in which anode and cathode are present as electrodes. The anode is present on the left side at which oxidation occurs. The cathode is present on the right side at which reduction occurs and in the middle, there is a salt bridge which is depicted by parallel lines. Therefore, the galvanic cell is Cu|Cu²⁺ |Ag⁺ |Ag.