Redox Reactions & Electrochemistry Flashcards for NEET — 20 cards

First 8 of 20 Redox Reactions & Electrochemistry flashcards

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1. Card 1 of 20

   State Faraday's First Law of Electrolysis.

   Hint: $Z$ is electrochemical equivalent. Charge $Q = I \times t$.

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   Answer

   The mass of a substance deposited or liberated at an electrode is directly proportional to the quantity of electricity (charge) passed through the electrolyte. $m = Z \cdot I \cdot t$

2. Card 2 of 20

   What are the rules for the oxidation state of Oxygen in regular oxides, peroxides, and superoxides?

   Hint: Oxygen's oxidation state increases (becomes less negative) as the oxygen-to-metal ratio increases.

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   Answer

   Regular Oxides: -2 Peroxides (e.g., $H_2O_2$): -1 Superoxides (e.g., $KO_2$): -1/2

3. Card 3 of 20

   What is the relationship between the Electrochemical Equivalent ($Z$) and Equivalent Weight ($E$)?

   Hint: 1 Faraday ($96500 \text{ C}$) deposits 1 Gram Equivalent of a substance.

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   Answer

   $Z = \frac{E}{96500}$

4. Card 4 of 20

   Calculate the oxidation number of Chromium (Cr) in $CrO_5$.

   Hint: Remember its 'butterfly' structure. It has peroxide linkages.

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   Answer

   Calculated by formula it gives +10 (incorrect). The structure has 4 oxygen atoms in peroxide bonds (-1) and 1 in a double bond (-2). $x + 4(-1) + 1(-2) = 0 \implies x = +6$.

5. Card 5 of 20

   Define a Disproportionation reaction.

   Hint: One reactant splits into two products with different oxidation states.

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   Answer

   Example: $2H_2O_2 \rightarrow 2H_2O + O_2$ Oxygen goes from -1 in $H_2O_2$ to -2 in $H_2O$ (reduction) and 0 in $O_2$ (oxidation).

6. Card 6 of 20

   State the LOAN mnemonic for a Galvanic (Voltaic) cell.

   Hint: In electrolytic cells, the anode is positive. LOAN is strictly for Galvanic cells!

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   Answer

   Left side, Oxidation occurs, it is the Anode, and it has a Negative charge.

7. Card 7 of 20

   What is the formula for Standard Cell Potential ($E^\circ_{cell}$)?

   Hint: Both values must be Standard REDUCTION Potentials.

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   Answer

   $E^\circ_{cell} = E^\circ_{cathode} - E^\circ_{anode}$

8. Card 8 of 20

   How do you identify the strongest oxidizing and reducing agents from the Electrochemical Series?

   Hint: High reduction potential means it wants to be reduced, forcing oxidation on others.

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   Answer

   Highest standard reduction potential ($+ve$): Strongest Oxidizing Agent (e.g., $F_2$). Lowest standard reduction potential ($-ve$): Strongest Reducing Agent (e.g., $Li$).