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i)When the aqueous solution of potassium dichromate is treated with calculated amount of KOH, potassium chromate is formed. K 2 Cr 7 O 7 + 2KOH → 2K 2 CrO 4 + H 2 O ii) When an alkali is added to an orange red solution containing dichromate ions, a yellow solution is obtained due to the formation of chromate ions. K 2 Cr 2 O 7 + K 2 CO 3 → 2 K 2 CrO 4 + CO 2

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The d-And-f-Block Elements

Short Answer Type

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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83.

Give chemical equation of reaction when pyrolusite ore is fused with KOH in presence of air.

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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?

i)When the aqueous solution of potassium dichromate is treated with calculated amount of KOH, potassium chromate is formed.

K₂Cr₇O₇ + 2KOH → 2K₂CrO₄ + H₂O

ii) When an alkali is added to an orange red solution containing dichromate ions, a yellow solution is obtained due to the formation of chromate ions.

K₂Cr₂O₇ + K₂CO₃ → 2 K₂CrO₄ + CO₂