Home
Class 8
PHYSICS
Electrolysis is used to obtain chlorine ...

Electrolysis is used to obtain chlorine and caustic soda from_________.

A

Water

B

Copper sulphate

C

Common salt

D

Magnesium chloride

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "Electrolysis is used to obtain chlorine and caustic soda from_________", we will follow these steps: ### Step-by-Step Solution: 1. **Identify the Products**: We need to obtain chlorine (Cl₂) and caustic soda (sodium hydroxide, NaOH) through electrolysis. 2. **Review the Options**: The options provided are: - Water (H₂O) - Copper sulfate (CuSO₄) - Common salt (NaCl) - Magnesium chloride (MgCl₂) 3. **Determine the Source**: We need to find which of these substances can be electrolyzed to produce both chlorine and sodium hydroxide. 4. **Analyze Common Salt (NaCl)**: - When NaCl is dissolved in water, it dissociates into sodium ions (Na⁺) and chloride ions (Cl⁻). - During electrolysis, at the cathode (negative electrode), Na⁺ ions are reduced to form sodium (Na), and water (H₂O) is also present, which can provide hydroxide ions (OH⁻). - At the anode (positive electrode), Cl⁻ ions are oxidized to form chlorine gas (Cl₂). 5. **Write the Reactions**: - At the cathode: \[ 2H₂O + 2e⁻ \rightarrow H₂ + 2OH⁻ \] (This produces hydroxide ions, which combine with sodium to form NaOH.) - At the anode: \[ 2Cl⁻ \rightarrow Cl₂ + 2e⁻ \] (This produces chlorine gas.) 6. **Conclusion**: The electrolysis of common salt (NaCl) in water produces both chlorine gas and sodium hydroxide. Therefore, the correct answer is **common salt (NaCl)**. ### Final Answer: Electrolysis is used to obtain chlorine and caustic soda from **common salt (NaCl)**. ---
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • CHEMICAL EFFECTS OF ELECTRIC CURRENT

    PEARSON IIT JEE FOUNDATION|Exercise TRACK YOUR LEARNING-IV|5 Videos
  • CHEMICAL EFFECTS OF ELECTRIC CURRENT

    PEARSON IIT JEE FOUNDATION|Exercise HOTS|10 Videos
  • CHEMICAL EFFECTS OF ELECTRIC CURRENT

    PEARSON IIT JEE FOUNDATION|Exercise TRACK YOUR LEARNING-II|6 Videos
  • KINEMATICS

    PEARSON IIT JEE FOUNDATION|Exercise LEVEL 3|18 Videos
  • DYNAMICS

    PEARSON IIT JEE FOUNDATION|Exercise CONCEPT APPLICATION(LEVEL 3)|15 Videos

Similar Questions

Explore conceptually related problems

Formula of Caustic soda is

The process of electrolysis is used for obtaining such metals which are

Knowledge Check

  • Caustic soda is

    A
    Efflourescent
    B
    Deliquescent
    C
    Hygroscopic
    D
    Oxidant
  • Caustic soda is

    A
    Effluorescent
    B
    Deliquescent
    C
    Oxidant
    D
    Reductant.
  • The pH of caustic soda is

    A
    `gt 7`
    B
    `lt 7`
    C
    7
    D
    0
  • Similar Questions

    Explore conceptually related problems

    The formula of caustic soda is

    The formula of caustic soda is

    The formula of caustic soda is

    The formula of caustic soda is

    Be reacts with excess of caustic soda to form