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Question

Equivalent mass of chlorine molecule in the equation
3Cl2+6NaOH5NaCl+NaClO3+3H2O

A
42.6
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B
35.5
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C
59.1
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D
71
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Solution

The correct option is

B

42.6

The two half-reactions are:

Oxidation: 6OH + ½ Cl2 → 2ClO3 + 5e + 3H2O

Reduction: 52Cl2 + 5e → 5Cl

3 moles of Cl2 and 5 moles of electrons are involved in the redox reaction

Molar mass of Cl2 = 71g/mol

Equivalentmassofoxidisingagent(or)reducingagent=no.ofmolesofoxidisingorreducingagent×Molarmassno.ofelectronstakingpartinredoxreaction

Therefore, the equivalent mass of Cl2 in the reaction = 3×715=42.6gmol


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