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81. Zn and Hg has little tendency to form complex compounds. Why?

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82. What is the oxidation state of chromium in (a) potassium dichromate, (b) potassium chromate?

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When pyrolusite is fused with KOH in air green colour of potassium mangante is formed.

\underset{pyrolusite ore}{2 {MnO}_{2}} + 4 KOH + O_{2} \to \underset{Potassium manganate}{2 K_{2} {MnO}_{4}} + 2 H_{2} O

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84.

Why is hydrochloric acid not used to acidify a permanganate solution in volumetric estimation of Fe²⁺ or C₂O₄^2–?

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85.

Write an ionic equation representing the oxidising property of acidified potassium permanganate solution.

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86. Give one reaction in which neutral solution of KMnO₄ acts as an oxidizing agent.

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87. How would you convert potassium dichromate to potassium chromate?

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88. What happens when SO₂ gas is passed through an acidified K₂Cr₂O₇ solution?

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89. Why is K₂Cr₂O₇ generally preferred over Na₂Cr₂O₇ in volumetric analysis although both are oxidising agents?

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90. Write a balanced equation for the reaction of K₂Cr₂O₇ with ferrous sulphate solution in presence of dil. H₂SO₄.

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