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The role of starch in iodometric titrati...

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

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The correct Answer is:
C
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There are two types of iodine titrations (a) Iodometric & (b) Iodimetric, Iodometric method is indirect method of I_(2) estimation. Any oxidant which liberates I_(2) from KI solution, the liberated iodine is estimated by titrating it with Na_(2)S_(2)O_(3) solution as : I_(2)+2Na_(2)S_(2)O_(3)rarr2NaI+Na_(2)S_(4)O_(6) 100 mL of .x. M K_(2)Cr_(2)O_(7) solution is added to excess of KI solution in acidic medium. The liberated iodine required 50 mL of 0.1N Na_(2)S_(2)O_(3) solution. The value of x is

AAKASH SERIES-STOICHIOMETRY-Objective Exercise -1
  1. The strength of an aqueous solution of I(2) can be determined by titra...

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  2. In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equi...

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  3. The role of starch in iodometric titrations is that

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  4. Number of moles of FeSO4 that can reduce one mole of permanganate in a...

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  5. Equivalent weight of As(2)O3 in the following equation As(2)O3 +2I(2) ...

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  6. Which of the following statement is correct for a galvanic cell?

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  7. In a electrochemical cell

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  8. The electrode potential of an electrode is

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  9. Which of the following may not be present in all galvanic cells

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  10. Daniel cell is shown as

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  11. Which of the following metals will not react with solution of CuSO4 ?

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  12. In the copper zinc cell

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  13. The mass ofCO(2) obtained when 2g of pure limestone is calcined is

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  14. What is the weight of oxygen that is required for the complete combust...

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  15. Xg of Ag was dissolved in HNO3 and the solution was treated with exces...

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  16. 1.2g of Mg (At. mass 24) will produce MgO equal to

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  17. 30 g of marble stone on heating produced 11g of CO2. The percentage of...

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  18. The weight of oxygen required to completely react with 27g  of Al is

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  19. The number of moles of CO(2) produced when 3 moles of HCl react with e...

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  20. The weight of a pure sample of KCIO(3) to be decomposed in order to ge...

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