Test: Redox Reactions and Electrode Processes (August 30) - NEET MCQ

The ClO₄^– ion cannot exhibit a disproportionation reaction because the chlorine in ClO₄^– is present in its maximum oxidation state, which is +7. Disproportionation reactions occur only when an element is present in its intermediate oxidation state.

The solutions in which the electrodes are immersed are called electrolytes. The chemical reaction that takes placein a galvanic cell is the redox reaction. One electrode acts as anode in whichoxidation takes place and the other acts as the cathode in which reductiontakes place.the half-cell occurs is called reduction half-cell and the reaction taking place in it is called reduction half-cell reaction. The electrode where oxidation occurs is called anode and the electrode where reduction occurs is termed cathode. Electrons flow from anode to cathode in the external circuit.

Reduction potential of fe is more than that of cr, so fe will reduce and act as cathode and cr will act as anode. now emf of cell is reduction potential of cathode - reduction potential of anode. so EMF= -0.45-(-0.75) = 0.3 V

The standard potential of hydrogen electrode is assumed to be zero at all temperature.

The Standard hydrogen electrode (abbreviated SHE), is a redox electrode which forms the basis of the thermodynamic scale of oxidation-reduction potentials. Its absolute electrode potential is estimated to be 4.44 ± 0.02 V at 25 °C, but to form a basis for comparison with all other electrode reactions, hydrogen's standard electrode potential (E⁰) is declared to be zero volts at all temperatures.

In a displacement reaction, a metal or a non-metal in a compound can be displaced by another metal in the uncombined state. So the above reaction X + YZ → XZ + Z is a displacement reaction.

Reduction potential means the tendency to reduce itself, i.e SO if we need reducing agent, then we need elements having more oxidising potential or reversing reduction potential order.
The order of reduction potential - O < N < M
So the order of reducing agent = M < N < O

Since anode is negatively charged and in anode oxidation takes place, so the element having lower SRP value would act as anode. so answer is K⁺/K.

The chemical combination reaction results in the formation of a new compound from two element substances. The above formation of Sulphur dioxide from Sulphur and oxygen is a type of combination reaction.