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For decolourisation of 1 mole of KMnO ₄ , the moles of H ₂ O ₂ required is

Options

  1. A1 2
  2. B3 2
  3. C5 2
  4. D7 2

Correct answer

C. 5 2

Step-by-step solution

The reaction for decolourisation of 1 mole of KMnO ₄ by H ₂ O ₂ are given as follow: 2 KMnO ₄+3 H ₂ SO ₄ K ₂ SO ₄+2 MnSO ₄ +3 H ₂ O +5[ O ] 5 H ₂ O ₂+5[ O ] 5 H ₂ O +5 O ₂ The overall reaction is 2 KMnO ₄+3 H ₂ SO ₄+5 H ₂ O ₂ K ₂ SO ₄+2 MnSO ₄ +8 H ₂ O +5 O ₂ As 2 moles of KMnO ₄ require H ₂ O ₂=5 moles 1 mole of KMnO ₄ require H ₂ O ₂= 5 2 =2.5 moles

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