Advertisements
Advertisements
प्रश्न
Complete the reaction mentioning all the products formed:
\[\ce{Cr2O^{2-}7 + 3H2S + 8H^+ ->}\]
Advertisements
उत्तर
\[\ce{Cr2O^{2-}7 + 3H2S + 8H^+ -> 2Cr^{3+} + 7H2O + 3S}\]
Dichromate oxidises hydrogen sulphide to sulphur in an acidic medium.
APPEARS IN
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:Cr2O72- + 2OH- →
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.
Complete the following chemical equations :
Cu + H2SO4(conc.) →
E0 value for Mn3+ Mn2+ couple is much more positive than that for Cr3-/ Cr2-.
Write the chemical equation for the preparation of 4 KMnO from 2. MnO Why does purple colour of acidified permanganate solution decolourise when it oxidises Fe2- to Fe3+ ?
Write the ionic equation showing the oxidation of Fe(II) salt by acidified dichromate solutions.
\[\ce{KMnO4}\] acts as an oxidising agent in alkaline medium. When alkaline \[\ce{KMnO4}\] is treated with \[\ce{KI}\], iodide ion is oxidised to ______.
Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of ______.
Complete the following ionic equation:
\[\ce{Cr2O^{2-}7 + 2OH^- ->}\]
