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STD 12 - p -Block elements - ll — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - p -Block elements - ll4 Marks
MCQ
In chromyl chloride test, oxidation state of $Cr$ changes from
  • A
    $+6$ to $0$
  • B
    $+6$ to $+4$
  • C
    $+4$ to $+2$
  • ✓
    Remains constant
✓

Answer

Correct option: D.
Remains constant
d
Chlorine bleaches by the process of oxidation. It needs moisture for its bleaching action.

Chlorine reacts with water to form hydrochloric and hypochlorous acids.

$Cl_2+ H_2 O \longrightarrow HCl + HClO$

Hypochlorous acid is unstable, and it easily dissociates to form nascent oxygen.

$HClO \longrightarrow HCl +[ O ]$

Nascent oxygen is a more powerful oxidising agent. Its formation is responsible for the bleaching nature of chlorine in the presence of moisture.

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