Question

When electricity passes through NaCl aqueous solution *

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A. Sodium metal is deposited

B. Only Chlorine gas is produced

C. Chlorine & Hydrogen gases are produced

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Answer 1

Answer:

When electricity passes through $NaCl$ aqueous solution, chlorine and hydrogen gases are produced.

Explanation:

• When electricity is passed through an aqueous solution of sodium chloride  

($NaCl$), three important products are produced. They are

1. Sodium hydroxide ($NaOH$)
2. Chlorine ($Cl$)
3. Hydrogen ($H$)

Since chlorine and alkali ($NaOH$) are produced in this process, it is called the Chlor-alkali process.

$NaCl$ (aqueous) + $2H$₂$O$ ------------> $2NaOH$ (aq) + $Cl$₂ + $H$₂

• During the process, positively charged $Na^{+}$ ions move towards negatively charged electrodes, and negatively charged $Cl^{-}$ move towards positively charged anode.
• A cathode is a negatively charged electrode and therefore attracts $Na^{+}$   ions. Anode is a positively charged electrode and therefore attracts $Cl^{-}$ions.