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When aqueous sodium hydroxide is added t...

When aqueous sodium hydroxide is added to an aqueous solution of chromium (III) ions, a green blue precipitate is first formed which re-dissolves to give a greeen solution. This green colour is due to :

A

`[Cr(H_(2)O)_(6)]^(3+)`

B

`CrO_(4)^(2-)`

C

`[Cr(OH)_(4)]^(-)`

D

`[Cr(OH)_(3)(H_(2)O)_(3)]`

Text Solution

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The correct Answer is:
C
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VK JAISWAL ENGLISH-d-BLOCK ELEMENTS-Level 2
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  2. Anhydrous mercurous chloride can be prepared by:

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  3. When aqueous sodium hydroxide is added to an aqueous solution of chrom...

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  4. HgCl is a covalent compound, sparingly soluble in water, the solubilit...

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  5. Amongst TiF(6)^(2-), CoF(6)^(3-), Cu(2)Cl(2) and NiCl(4)^(2-) the colo...

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  6. Which of the following complex ion has a magnetic moment same as [Cr(H...

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  7. Silver nitrate solution is kept in brown bottles in laboratory because...

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  9. Fe(OH)(2) is precipitated from Fe(II) solutions as a while solid turn...

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  10. Pure O(2) instead of air is used to oxidise the pig iron because:

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  16. The aqueous solution of copper(II) sulphate is slowly hydrolysed formi...

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  17. Passivity of iron is due to formation of:

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  18. Zinc carbonate is precipitated from zinc sulphate solution by the addi...

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  19. Mark the correct statements:

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