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Class 11
Chemistry
Redox Reactions
chlorine is used to purify drinking water excess...

Question:
Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.

Answer:

The given redox reaction can be represented as:

Cl_2(s)+ SO_2(aq) + H₂O_(l) → Cl^-_(aq) + SO^2-_4(aq)

The oxidation half reaction is:

S⁺⁴ O_2(aq)→ S⁺⁶O^2-_4(aq)

The oxidation number is balanced by adding two electrons as:

SO_2(aq) → SO^2-_4(aq) + 2e^-

The charge is balanced by adding 4H⁺ ions as:

SO_2(aq) → SO^2-_4(aq) + 4H⁺_(aq) + 2e^-

The O atoms and H+ ions are balanced by adding 2H2O molecules as:

SO_2(aq) + 2 H₂O_(l) → SO^2-_4(aq) + 4H⁺_(aq) + 2e^-..........(i)

The reduction half reaction is: The chlorine atoms are balanced as:

Cl_2(s) → Cl^-_(aq)

The oxidation number is balanced by adding electrons

Cl_2(s) + 2e^- → 2 Cl^-_(aq)............(ii)

The balanced chemical equation can be obtained by adding equation (i) and (ii) as:

Cl_2(s) + SO_2(aq) + 2 H₂O_(l) → 2 Cl^-_(aq)+ SO^2-_4(aq) + 4H⁺_(aq)

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Question:
Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.

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Question: Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.

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Question:
Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.