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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

KMnOX4 acts as an oxidising agent in alkaline medium. When alkaline KMnOX4 is treated with KI, iodide ion is oxidised to ______. - Chemistry

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प्रश्न

\[\ce{KMnO4}\] acts as an oxidising agent in alkaline medium. When alkaline \[\ce{KMnO4}\]  is treated with \[\ce{KI}\], iodide ion is oxidised to ______.

पर्याय

  • \[\ce{I2}\]

  • \[\ce{IO^-}\]

  • \[\ce{IO^-3}\]

  • \[\ce{IO^-4}\]

MCQ
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उत्तर

\[\ce{KMnO4}\] acts as an oxidising agent in alkaline medium. When alkaline \[\ce{KMnO4}\]  is treated with \[\ce{KI}\], iodide ion is oxidised to \[\ce{IO^-}\].

Explanation:

\[\ce{2KMnO4 + KI + H2O -> 2KOH + 2MnO2 + KIO3}\]

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पाठ 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ १०८]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 12
पाठ 8 The d-and f-Block Elements
Multiple Choice Questions (Type - I) | Q 16 | पृष्ठ १०८

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 chemical equation

Cr2O72- + 3Sn2+ + 14H+


Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?


Give an example and suggest a reason for the following feature of the transition metal chemistry:

A transition metal exhibits the highest oxidation state in oxides and fluorides.


Complete the following chemical equations :

Cu + H2SO4(conc.) →


E0 value for  Mn3+ Mn2+ couple is much more positive than that for Cr3-/ Cr2-.


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.


Which of the following reactions are disproportionation reactions?

(a) \[\ce{Cu^{+} -> Cu^{2+} + Cu}\]

(b) \[\ce{3MnO^{-}4 + 4H^{+} -> 2MnO^{-}4 + MnO2 + 2H2O}\]

(c) \[\ce{2KMnO4 -> K2MnO4 + MnO2 + O2}\]

(d) \[\ce{2MnO^{-}4 + 3Mn^{2+} + 2H2O -> 5MnO2 + 4H^{+}}\]


Which of the following is amphoteric oxide?

\[\ce{Mn2O7, CrO3, Cr2O3, CrO, V2O5, V2O4}\]


In the form of dichromate, \[\ce{Cr (VI)}\] is a strong oxidising agent in acidic medium but \[\ce{Mo (VI)}\] in \[\ce{MoO3}\] \[\ce{and W (VI)}\] in \[\ce{WO3}\] are not because:

(i) \[\ce{Cr(VI)}\] is more stable than \[\ce{Mo(VI)}\] and  \[\ce{and W(VI)}\].

(ii) \[\ce{Mo(VI)}\] and \[\ce{and W(VI)}\] are more stable than  \[\ce{Cr(VI)}\].

(iii) Higher oxidation states of heavier members of group-6 of transition series are more stable.

(iv) Lower oxidation states of heavier members of group-6 of transition series are more stable.


Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively.


Potassium permanganate on heating at 513 K gives a product which is ______.


Complete the following ionic equation:

\[\ce{Cr2O^{2-}7 + 2OH^- ->}\]


Complete the reaction mentioning all the products formed:

\[\ce{2KMnO4 ->[\Delta]}\]


Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.


Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore. 


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.


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