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An impure sample of sodium oxalate (Na2C...

An impure sample of sodium oxalate `(Na_2C_2O_4)` weighing `0.20 g` is dissolved in aqueous solution of `H_2SO_4` and solution is titrated at 70 C requiring `45mL` of `0.02 MKMnO_4` solution. The end point is overrun, and back titration in carried out with `10mL` of `0.1M` oxalic acid solution. Find the % purity of `Na_2C_2O_4` in sample :

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NARENDRA AWASTHI-STOICHIOMETRY-Level 3 - Subjective Problems
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  2. What volume of a liquid (in L) will contain 10 mole ? If molar mass of...

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  3. 16 g of SO(x) gas occupies 5.6 L at 1 atm and 273 K.What will be the v...

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  4. 200 mL of 1 HCl, is mixed with 300 mL of 6 M and the final solution i...

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  5. N(2)(g) reacts with H(2)(g) in either of the following ways depending ...

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  6. Phospheric acid (H(3)PO(4)) perpared in two step process . ...

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  7. W is the mass of iron (in g) which will be converted into Fe(3)O(4) by...

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  8. Calculate the total moles of atoms of each element present in 122.5 g ...

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  9. On dissolving 2.0 g of metal in sulphuric acid ,4.51 g of the metal su...

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  10. One gram of a metallic chloride was found to contain 0.835 g of chlori...

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  11. Calculate number of gram atoms in 103g of KOH.

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  12. The emperical formula of the sucrose is:

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  13. The number of atoms of He in 104 amu is:

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  14. When BrO(3)^(-) ion reacts with Br^(-) ion in acidic medium, Br(2) is ...

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  15. A volume of 12.5 mL of 0.05 M SeO(2) reacts with 25 mL of 0.1 M CrSO(4...

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  16. A 0.276 g impure sample of copper ore is dissolved and Cu^(2+) is titr...

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  17. A sample of 28 mL of H(2) O(2) (aq) solution required 10 mL of 0.1 M K...

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  18. For the redox reaction given, what is the value of (x)/(z) ? xNO(3)^...

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  19. On heating 0.220 g of a metallic oxide in presence of hydrogen,0.045 g...

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  20. 10 g mixture of K(2)Cr(2)O(7) and KMnO(4) was treated with excess of K...

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  21. In an ore, the only oxidizable material is Sn^(2+). This ore is titrat...

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