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प्रश्न
Which of the following is amphoteric oxide?
\[\ce{Mn2O7, CrO3, Cr2O3, CrO, V2O5, V2O4}\]
विकल्प
\[\ce{V2O5, Cr2O}\]
\[\ce{Mn2O7, CrO3}\]
\[\ce{CrO, V2O5}\]
\[\ce{V2O5, V2O4}\]
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उत्तर
\[\ce{V2O5, Cr2O}\]
Explanation:
\[\ce{V2O5}\] and \[\ce{Cr2O3}\] are amphoteric oxides because both react with alkalies as well as acids.
Remember: In lower oxides, the basic character is predominant while in higher oxides, the acidic character is predominant.
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संबंधित प्रश्न
When chromite ore FeCr2O4 is fused with NaOH in presence of air, a yellow-coloured compound (A) is obtained, which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with KCl forms an orange coloured crystalline compound (C).
(i) Write the formulae of the compounds (A), (B) and C.
(ii) Write one use of compound (C).
Complete the following equations : 2 Na2CrO4 + 2 H + →
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The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.
Indicate the steps in the preparation of KMnO4 from pyrolusite ore.
E0 value for Mn3+ Mn2+ couple is much more positive than that for Cr3-/ Cr2-.
Write the ionic equation showing the oxidation of Fe(II) salt by acidified dichromate solutions.
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Complete the reaction mentioning all the products formed:
\[\ce{2KMnO4 ->[\Delta]}\]
Indicate the step in the preparation of K2Cr2O7 from chromite ore.
Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.
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