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KMnO(4) is a strong oxidising agent in a...

`KMnO_(4)` is a strong oxidising agent in acidic medium. To provide acidic medium `H_(2)SO_(4)` is used instead of HCl. This is because

A

`H_(2)SO_(4)` is a stronger acid than `HCl`

B

HCl is oxidised by `KMnO_(4)` to `Cl_(2)`

C

`H_(2)SO_(4)` is dibasic acid

D

Rate is faster in the presence of `H_(2)SO_(4)`

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The correct Answer is:
B
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In permanganate titrations, potassium pemanganats is used an an oxidizing agent in acidic medium. The medium is maintained acidic by the use of dilute sulphuric acid. Potassium permanganate acts as self indicator . The potential equation, when potassium permanganate acts as an oxidizing agent is 2KMnO_(4) + 3H_(2)SO_(4) to K_(2)SO_(4) + 2MnSO_(4) + 3H_(2)O + 5[O] or MnO_(4)^(-) + 8H^(+) + 5e^(-) to Mn^(2+) + 4H_(2)O Before the end point, the solution remains colourless but after teh equivalence point only one extra drop of KMnO_(4) solution imparts pink colour , i.e. appearance of pink colour indicates end point. These titrations are used for estimation of ferrous salts, oxalic acid, oxalates, hydrogen peroxide, As_(2)O_(3) etc. In order to prepare one litre of normal solution of KMnO_(4) , how many grams of KMnO_(4) is required if solution is to be used in acid medium for oxidation ?

AAKASH INSTITUTE ENGLISH-REDOX REACTIONS-Assignment (Section A) (Objective type Questions (one option is correct))
  1. The oxidation number of S in S(8),S(2)F(2), and H(2)S, respectively, a...

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  2. The oxidation number of C in HNC is

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  3. The oxidation number of Cl in CaOCl(2) is

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  4. Which of the following molecules can act as an oxidising agent as well...

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  5. The oxidation state of iodine in ICI(3) is

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  6. The pair of compounds having metals in their highest oxidation state i...

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  7. Consider a titration of potassium dichromate solution with acidified M...

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  8. Number of moles of MnO(4)^(-) required to oxidise one mole of ferrous ...

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  9. The reaction,P(4)+3NaOH+3H(2)O to 3NaH(2)PO(2)+PH(3) is an example of

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  10. CrO(5) has structure as shown The oxidation number of chromium in...

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  11. The oxidation states of S atom in S(4)O(6)O^(2-) from left to right re...

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  12. The oxidation number of phosphorus in PO(4)^(3-), P(4)O(10), and P(2)O...

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  13. The reaction 5H(2)O(2)+XClO(2)+2OH^(-) rarr XCl^(-)+YO(2)+6H(2)O i...

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  14. Nitrogen forms a variety of compounds in all oxidation states ranging ...

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  15. KMnO(4) is a strong oxidising agent in acidic medium. To provide acidi...

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  16. Oxidation states of P in H(4)P(2)O(5),H(4)P(2)O(6),H(4)P(2)O(7) respec...

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  17. In this reaction: S(2)O(8)^(2-)+2I^(-) to 2SO(4)^(2-)+I(2)

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  18. Which of the following has the highest value of E("red")^(@) ?

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  19. Which of the following species has an atom with +6 oxidation state?

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  20. The oxidant which cannot act as a reducing agent is

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