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When K2 Cr2 O7 is converted to K2 CrO4 t...

When `K_2 Cr_2 O_7` is converted to `K_2 CrO_4` then change in the oxidation state of chromium is :

A

0

B

6

C

4

D

3

Text Solution

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The correct Answer is:
A
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In the preparation of KMnO4, pyrolusite (MnO_(2)) is first converted to potassium magnate (K_(2)MnO_(4)) . In this conversion, the oxidation state of manganese changes from

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Calculate the oxidation number of 'Cr' in K_2Cr_2O_2 .

NARENDRA AWASTHI-STOICHIOMETRY-Level 1 (Q.121 To Q.150)
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  2. 2 moles of N(2)H(4) loses 16 moles of electrons is being converted to ...

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  3. When K2 Cr2 O7 is converted to K2 CrO4 then change in the oxidation st...

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  4. When a manganous salt is fused with a mixture of KNO3 and solid NaOH, ...

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  5. In Fe(II) -MnO(4)^(-) "tirtration" HNO(3) is not used beacause:

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  6. Which species are oxidised and reduced in the reaction? FeC(2)O(4)+K...

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  7. In which of the following reaction, H(2)O(2) is acting as a reducing a...

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  8. Following reaction describes the rusting of iron 4Fe+3O(2)rarr4Fe^(3+)...

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  9. Which of the following reactions does not represent the aldol condensa...

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  10. Which of the following is redox reaction

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  11. Which of the following is redox reaction

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  12. Balance the following chemcial reaction. MnO(4)^(-)+SO(3)^(2-)+H^(+)...

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  13. In the chemical reaction, K(2)Cr(2)O(7)+xH(2)SO(4)+ySO(2)rarrK(2)SO(...

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  14. In SOCl(2) and SO(2)Cl(2)

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  15. Balance the followings equations and choose the quantity which is the ...

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  16. If 0.1 mole H(3)PO(x) is completely neutralised by 5.6g KOH then selec...

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  17. When potassium permanganate is titrated against ferrous ammonium sulph...

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  18. Equivalent mass of FeS2 in the half reaction, FeS2 + O2 rarr Fe2 O3+SO...

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  19. The equaivalent mass of HCl in the given reaction is : K2Cr2O7 + 14HCl...

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  20. Equivalent weight of H(3)PO(2) when it disproportionates into PH(3) an...

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