When Brine solution is subjected to electrolysis the gases liberated at anode and at cathode are

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Cl₂ and O₂

Cl₂ and H₂

H₂ and Cl₂

H₂ and O₂

answer is D.

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Detailed Solution

When a brine solution (sodium chloride dissolved in water) is subjected to electrolysis, the following gases are liberated:

At the anode (positive electrode): chlorine gas (Cl₂) is liberated. This is because chloride ions (Cl^-) are oxidized to form chlorine gas, according to the following reaction:

2Cl^-→ Cl₂ + 2e-

At the cathode (negative electrode): hydrogen gas (H₂) is liberated. This is because water molecules (H₂O) are reduced to form hydrogen gas and hydroxide ions (OH^-), according to the following reaction:

2H₂O + 2e^- → H₂ + 2OH^-

So the overall reaction for the electrolysis of brine can be written as:

2NaCl + 2H₂O → Cl₂+ H₂ + 2NaOH

Note that sodium hydroxide (NaOH) is also produced as a byproduct of the electrolysis process.

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