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Thermal decomposition of a Mn compound X at 513 K results in compound Y , M n O 2 and a gaseous product. M n O 2 reacts with N a C l and concentrated H 2 S O 4 to give a pungent gas Z . X , Y and Z , respectively, are:

Options

  1. AK 3 M n O 4 , K 3 M n O 4 and C l 2
  2. BK 2 M n O 4 , K M n O 4 and C l 2
  3. CK 2 M n O 4 , K M n O 4 and S O 2
  4. DK M n O 4 , K 2 M n O 4 and C l 2

Correct answer

D. K M n O 4 , K 2 M n O 4 and C l 2

Step-by-step solution

Potassium manganate is water soluble and so is leached out as green filtrate. MnO 2 is insoluble in water and gives black residue. The oxygen gas is released in this reaction. In the first step potassium permanganate ( KMnO 4 ) the compound (X) decomposes on heating to give potassium manganate ( K 2 MnO 4 ) which is the compound (Y), MnO 2   and the gaseous product is oxygen. In the second step MnO 2 further reacts with NaCl and concentrated sulfuric acid to give a pungent-smelling gas that is Chlorine gas ( C

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