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Which relation involve iodimetric titrat...

Which relation involve iodimetric titration?

A

`2Na_(2)S_(2)O_(3)+I_(2)toNa_(2)S_(4)O_(6)+2NaI`

B

`2MNO_(4)^(-)+2I^(-)+16^(+)to2Mn^(+2)+8H_(2)O+5I_(2)`

C

`Na_(3)AsO_(3)+I_(2)+H_(2)OtoNa_(3)AsO_(4)+2HI`

D

`Cr_(2)O_(7)^(-2)+14H^(+)+5I^(-)to2Cr^(+3)+7H_(2)O+3I_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A, C, D
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Which process is involved in dirt cleaning ?

Iodine titrations: Compounds containing iodine are widely used in titrations, commonly known as iodine titration. It is of two kinds: (i) lodometric titrations (ii) lodimetric titrations. (i) lodometric titrations : It is nothing but an indirect method of estimating the iodine. In this type of titration, an oxidising agent is made to react with excess of KI, in acidic medium or, basic medium in which I_2 oxidises into L. Now the liberated I_2 can be titrated with Na_(2)S_(2)O_3 . solution. KI overset("Oxidising Agent")rarrI_(2)overset(Na_(2).S_(2)O_(3)//H^(+))rarrI^(-)+Na_(2)S_(4)O_6 Although solid I_2 is black and insoluble in water, but it converts into soluble I_3 ions underset("Black")(I_2(s))+IhArrunderset("Dark brown")(I_3^(-)) Starch is used as indicator near the end point or equivalence point. Even small amount of I_2 molecules, gives blue colour with starch. The completion of the reaction can be detected when blue colour disappears at the and point. In iodimetric titration, the strength of reducing agent is determined by reacting it with I_2 A solution containing Cu^(+2) and C_(2)O_(4)^(-2) ions M which on titration with M/10 KMnO_4 requires 50 mL. The resulting solution is neutralized with K_(2)CO_(3) then treated with excess of KI. M The liberated I_2 required 25 mL M/10 Na_(2)S_(2)O_3 in acidic solution, then what is the difference of the number of m mole of Cu^(+2) and C_(2)O_(4)^(-2) ions in the solution ?

Knowledge Check

  • Which of the following reactions involve oxidation reduction?

    A
    `2Rb+2H_(2)Oto2RbOH+H_(2)`
    B
    `3Me+N_(2)toMg_(3)N_(2)`
    C
    `NH_(4)Cl+NaOHtoNaCl+NH_(3)+H_(2)O`
    D
    `4KCN+Fe(CN)_(2)toK_(4)[Fe(CN)_(6)]`

  • The role of starch in iodometric titrations is that

    A
    it acts an oxidant
    B
    it is reducing agent
    C
    it acts as indicator
    D
    it is a medium

  • which of the following reactions involve hydride ion transfer ?

    A
    `2H - overset(O ) overset(||)C - H overset(overset(Ө)OH) to H - overset(O ) overset(||) C- overset(Ө)O +CH_3 -OH`
    B
    `2H_3C - overset(O ) overset(||)C -H underset(Delta) overset(overset(Ө)OH) to H_3 C - CH= CH - overset(O ) overset(||) C- H`
    C
    `2H_3 C- overset(O ) overset(||)C -H overset(AI (Oet)_2) to CH_3 - overset(O) overset(||) C -O- -CH_2 CH_3`
    D

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    The end point of iodometic titrations is detected by adding starch just near end point and not all the beginning of titration. Which statement is not valid for this falt?

    (A): Physical relations involving addition and subtraction cannot be derived by dimensional analysis. (R) Numerical constants cannot be deduced by the method of dimensions.

    (A) : Physical relations involving addition and subtraction cannot be derived by dimensional analysis. (R) : Numerical constants cannot be deduced by the method of dimensions.

    Which of the following reaction involves the liberation of energy?

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