Practice free Electrochemistry (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following is an advantage of a nickel-cadmium cell over a lead storage cell?
The NCERT text states: 'Another important secondary cell is the nickel-cadmium cell... which has longer life than the lead storage cell but more expensive to manufacture.'
What was a significant application of the H$_{2}$-O$_{2}$ fuel cell mentioned in the context?
The NCERT text highlights, 'One of the most successful fuel cells uses the reaction of hydrogen with oxygen to form water (Fig. 2.12). The cell was used for providing electrical power in the Apollo space programme.'
What happens to the water produced in the H$_{2}$-O$_{2}$ fuel cell used in the Apollo space programme?
The NCERT text states: 'The water vapours produced during the reaction were condensed and added to the drinking water supply for the astronauts.'
What catalysts are typically incorporated into the electrodes of a H$_{2}$-O$_{2}$ fuel cell to increase the rate of reactions?
The NCERT text mentions: 'Catalysts like finely divided platinum or palladium metal are incorporated into the electrodes for increasing the rate of electrode reactions' in a fuel cell.
What is the overall reaction for the H$_{2}$-O$_{2}$ fuel cell?
The NCERT text explicitly states the 'Overall reaction being: 2H$_{2}$(g) + O$_{2}$(g) $\rightarrow$ 2H$_{2}$O(l)' for the fuel cell using H$_{2}$ and O$_{2}$.
Which of the following is a characteristic of a primary battery?
The NCERT text defines primary batteries: 'In the primary batteries, the reaction occurs only once and after use over a period of time battery becomes dead and cannot be reused again.'
In a dry cell, what materials constitute the anode and cathode?
The NCERT text states for the dry cell: 'The cell consists of a zinc container that also acts as anode and the cathode is a carbon (graphite) rod surrounded by powdered manganese dioxide and carbon.'
What is the main reason why fuel cells are considered highly efficient compared to thermal power plants for electricity production?
The NCERT text explains: 'Production of electricity by thermal plants is not a very efficient method and is a major source of pollution. In such plants, the chemical energy (heat of combustion) of fossil fuels... is first used for converting water into high pressure steam... This is then used to run a turbine to produce electricity. We know that a galvanic cell directly converts chemical energy into electricity and is highly efficient.' This direct conversion minimizes energy losses.
The conductivity of centimolar solution of KCl at $25^\circ$C is $0.0210\ \text{ohm}^{-1}\,\text{cm}^{-1}$ and the resistance of the cell containing the solution at $25^\circ$C is $60\ \text{ohm}$. The value of cell constant is:
Cell constant $= \kappa\cdot R = 0.0210 \times 60 = 1.26\ \text{cm}^{-1}$.
A: In equation $\Delta_r G = -nFE_{cell}$, the value of $\Delta_r G$ depends on $n$. R: $E_{cell}$ is an intensive property and $\Delta_r G$ is an extensive property.
Both true. R is a true fact but does not directly justify A (which follows from the explicit $n$ in $-nFE$).
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