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Question

Acidified potassium permanganate solution is decolourised by:


A

Bleaching Powder

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B

White Vitriol

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C

Mohr's Salt

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D

Microcosmic salt

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Solution

The correct option is C

Mohr's Salt


The explanation for the correct answer

option (C): Acidified potassium permanganate solution is decolourised by Mohr’s salt.

  • Mohr’s Salt also referred to as ammonium iron(II) sulphate, is an inorganic compound whose chemical formula is represented as(NH4)2Fe(SO4)2(H2O)6.
  • The ferrous ion of Mohr's salt undergoes oxidation.

2KMnO4(aq)potassiumpermanganate+8H2SO4(aq)sulphuricacid+10FeSO4(aq)ferroussulphateK2SO4(aq)potassiumsulphate+2MnSO4(aq)manganesesulphate+5Fe2(SO4)3(aq)ferricsulphate+8H2O(aq)water

  • Mohr's salt decolourises KMnO4 by reducing Mn7+ ions to Mn2+ ions.

The explanation for the incorrect answer

Option (A): Bleaching Powder: The chemical name of bleaching powder is calcium hypochlorite

  • It is used for bleaching dirty clothes in the laundry and as a bleaching agent for cotton and linen in the textile industry.
  • The chemical formula:Ca(OCl)2.

Option (B): The chemical formula of white vitriol is ZnSO4.7H2SO4.The chemical name of white vitriol is Zinc Sulphate.

White vitriol is used in the synthesis of the antibacterial drug. It is used as an absorbent.

Option (D): The formula for microcosmic salt is Na(NH4)HPO4.

  • The other name for microcosmic salt is sodium ammonium hydrogen phosphate.

Therefore, the correct option is (C) i.e., Acidified potassium permanganate solution (KMnO4) is decolourised by Mohr's Salt.


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