हिंदी

Complete the following equations: Cr2O72- + 14H+ + 6I →

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प्रश्न

Complete the following equations: Cr2O72- + 14H+ + 6I →

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उत्तर

Cr2O72- + 14H+ + 6I → 2Cr3+ + 3I2 + 7H2O

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2015-2016 (March) All India Set 2 C

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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 equation :

`2MnO_4^(-)+6H^++5NO_2^(-)rarr`

 


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Answer the following question.
When MnO2 is fused with KOH in the presence of KNO3 as an oxidizing agent, it gives a dark green compound (A). Compound (A) disproportionates in an acidic solution to give a purple compound (B).  An alkaline solution of compound (B) oxidizes KI to compound (C) whereas an acidified solution of compound (B) oxidizes KI to (D). Identify (A), (B), (C), and (D).


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.


What is the effect of pH on dichromate ion solution?


Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of ______.


Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with oxalic acid? Write the ionic equation for the reaction.


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