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Question
Complete the following equations : 2 Na2CrO4 + 2 H + →
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Solution
2 Na2CrO4 + 2 H+ → Na2Cr2O7 + 2 Na+ + H2O
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Complete the following equations: Cr2O72- + 14H+ + 6I →
Give an example and suggest a reason for the following feature of the transition metal chemistry:
The highest oxidation state is exhibited in oxoanions of a metal.
Name a member of the lanthanoid series that is well-known to exhibit +2 oxidation state.
On addition of small amount of \[\ce{KMnO4}\] to concentrated \[\ce{H2SO4}\], a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.
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(a) \[\ce{Cu^{+} -> Cu^{2+} + Cu}\]
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(c) \[\ce{2KMnO4 -> K2MnO4 + MnO2 + O2}\]
(d) \[\ce{2MnO^{-}4 + 3Mn^{2+} + 2H2O -> 5MnO2 + 4H^{+}}\]
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\[\ce{Mn2O7, CrO3, Cr2O3, CrO, V2O5, V2O4}\]
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\[\ce{Cr2O^{2-}7 + 3H2S + 8H^+ ->}\]
Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.
Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.
Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with SO2? Write the ionic equation for the reaction.
