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When an aqueous solution of CaCl(2) is e...

When an aqueous solution of `CaCl_(2)` is electrolyzed using inert electrods, which of the following is `(` are `)` true ?
(a)Calcium deposites on cathode.
(b) Calcium deposits an anode
(c) Chloride is liberated on anode
(d) Calcium hydroxide precipitates near cathode on prolonged hydrolysis

A

Calcium deposites on cathode.

B

Calcium deposits an anode

C

Chloride is liberated on anode

D

Calcium hydroxide precipitates near cathode on prolonged hydrolysis

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the electrolysis of an aqueous solution of `CaCl₂` using inert electrodes, we need to analyze the reactions that occur at both the cathode and anode. ### Step-by-Step Solution: 1. **Identify the Components in the Solution**: - The aqueous solution of `CaCl₂` contains `Ca²⁺` ions and `Cl⁻` ions, along with water (`H₂O`). 2. **Electrolysis Process**: - Electrolysis involves the movement of ions towards the electrodes where reduction (gain of electrons) occurs at the cathode and oxidation (loss of electrons) occurs at the anode. 3. **Reactions at the Cathode**: - At the cathode, two possible reduction reactions can occur: - `Ca²⁺ + 2e⁻ → Ca` (calcium deposition) - `2H₂O + 2e⁻ → H₂ + 2OH⁻` (hydrogen gas and hydroxide ions) - Since water is more stable and has a lower reduction potential than calcium ions, the preferential reaction at the cathode will be the reduction of water, producing hydrogen gas and hydroxide ions. Therefore, calcium does **not** deposit at the cathode. 4. **Reactions at the Anode**: - At the anode, two possible oxidation reactions can occur: - `2Cl⁻ → Cl₂ + 2e⁻` (chlorine gas liberation) - `4OH⁻ → O₂ + 2H₂O + 4e⁻` (oxygen gas liberation) - The oxidation of chloride ions to chlorine gas is favored over the oxidation of hydroxide ions. Thus, chlorine gas is liberated at the anode. 5. **Prolonged Hydrolysis**: - During prolonged electrolysis, the hydroxide ions produced at the cathode can react with calcium ions in the solution to form calcium hydroxide (`Ca(OH)₂`), which is insoluble and precipitates out of the solution. ### Conclusion: Based on the analysis: - (a) Calcium deposits on cathode: **False** - (b) Calcium deposits at anode: **False** - (c) Chloride is liberated on anode: **True** - (d) Calcium hydroxide precipitates near cathode on prolonged hydrolysis: **True** Thus, the correct statements are **(c)** and **(d)**.

To solve the question regarding the electrolysis of an aqueous solution of `CaCl₂` using inert electrodes, we need to analyze the reactions that occur at both the cathode and anode. ### Step-by-Step Solution: 1. **Identify the Components in the Solution**: - The aqueous solution of `CaCl₂` contains `Ca²⁺` ions and `Cl⁻` ions, along with water (`H₂O`). 2. **Electrolysis Process**: ...
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