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प्रश्न
Why \[\ce{HCl}\] should not be used for potassium permanganate titrations?
Why is permanganate titration not carried out in the presence of \[\ce{HCl}\]?
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उत्तर
Permanganate titrations in the presence of hydrochloric acid are unsatisfactory since hydrochloric acid is oxidised to chlorine. Permanganate titration cannot be performed with hydrochloric acid as it can be oxidized to produce chlorine gas. As a result, we do not obtain accurate endpoints for any titration.
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संबंधित प्रश्न
Complete the following equations:

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`
Complete the following equations:Cr2O72- + 2OH- →
Complete the following equation :
Write the ionic equation showing the oxidation of Fe(II) salt by acidified dichromate solutions.
Which of the following is amphoteric oxide?
\[\ce{Mn2O7, CrO3, Cr2O3, CrO, V2O5, V2O4}\]
When orange solution containing \[\ce{Cr2O^{2-}7}\] ion is treated with an alkali, a yellow solution is formed and when \[\ce{H^+}\] ions are added to yellow solution, an orange solution is obtained. Explain why does this happen?
In the two tetrahedral structures of dichromate ion, ______.
Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.
