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When K(2)Cr(2)O(7) is heated with conc. ...

When `K_(2)Cr_(2)O_(7)` is heated with conc. `H_(2)SO_(4)` in the presence of a soluble metal chloride, orange red vapours are produced. These are due to :

A

`CrCl_(3)`

B

`CrOCl_(2)`

C

`CrO_(2)Cl_(2)`

D

`CrO_(4)^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
C
`K_(2)Cr_(2)O_(7) + 4NaCl + 6H_(2)SO_(4) to 2KHSO_(4) + 4NaHSO_(4) + underset("Chromyl chloride")(2CrO_(2)Cl_(2) + 3H_(2)O)`
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MODERN PUBLICATION-CHEMISTRY OF D-AND F-BLOCK ELEMENTS-Multiple Choice Questions (Level -I) Transition metal compounds and their Characteristics
  1. Which of the following is an acidic oxide ?

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  2. The brown ring test for nitrites and nitrates is due to the formation ...

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  3. When K(2)Cr(2)O(7) is heated with conc. H(2)SO(4) in the presence of a...

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  4. Acidifed K(2)Cr(2)O(7) oxidises H(2)S to :

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  5. The mass of gold in an 18 carat gold ring of 4 g is :

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  6. Potassium permangante on heating gives :

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  7. Mn(3)O(4) is a mixed oxide of :

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  8. The reaction MnO(4)^(-) + e^(-) to MnO(4)^(2-) occur in

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  9. Fe^(2+) and Fe^(3+) can be distinguished by :

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  10. The equivalent weight of MnSO(4) is half of its molecular weight when ...

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  11. When potassium dichromate crystals are heated with concentrated sulphu...

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  12. Acidified potassium dichromate is treated with hydrogen sulphide, IN t...

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  13. The oxidation states of Mn in K(2)MnO(4), KMnO(4) and Mn(2)O(7) are re...

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  14. In Cr(2)O(7)^(2-) :

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  15. In a redox reaction, how many moles of electrons are accepted by 1 mol...

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  16. Cr(2)O(3) dissolves in aqueous NaOH in the presence of an oxidant to f...

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  17. Passivity of iron is due to the formation of a thin layer of :

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  18. Two fo the constituents of German silver are :

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  19. The compound which gives off oxygen on moderate heating is :

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  20. Nessler's reagent is :

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