Question

Chlorine acts as a bleaching agent only in the presence Of

• A. dry air
• B. moisture
• C. sunlight
• D. pure oxygen

Answer 1

Answer: (B)

moisture

Answer 2

Moist chlorine gives nascent oxygen, act as oxidising
agent:
$\, \, \, \, \, \, \, \, \, \, \, \, Cl_2 + H_2O \longrightarrow HCl + HOCl$
$\, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, HOCl \longrightarrow HCl+\, \, \, \, ^{\, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, [O]}_{nascent\, oxygen\, (bleaching action)}$