When a solution of $N a_{2} C r_{2} O_{7}$ is treated with amyl alcohol and acidified $H_{2} O_{2}$ , the layer of amyl alcohol turns blue. What is the blue colouration?

C r^{2 +}

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C r O_{5}

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C r O_{4}

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C r^{2 +} + C r O_{5}

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Solution

The correct option is A $C r O_{5}$
When a solution of $N a_{2} C r_{2} O_{7}$ is treated with amyl alcohol, then, there is formation of the chromate ion.
$N a_{2} C r_{2} O_{7} + 2 O H^{-} \to 2 N a C r O_{4}^{2 -} + H_{2} O$

On reacting with acidified $H_{2} O_{2}$ converts to $C r O_{5}$ to give the blue coloration,
$N a_{2} C r O_{4} + 2 H_{2} O_{2} + 2 H^{+} \to C r O_{5} + 3 H_{2} O + 2 N a^{+}$

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Q. An acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of 1 mL of 3%

H_{2} O_{2}

. a blue alcohol layer was obtained. The blue color is due to the formation of a chromium (VI) compound 'X'. What is the number of oxygen atoms bonded to chromium through only single bonds in a molecule of X?

Q. A solution of

K_{2} C r_{2} O_{7}

acidified with

H_{2} S O_{4}

when treated with a substance 'X', gives a blue coloured solution of 'Y'. The substance 'X' and the oxidation state of central atom of compound 'Y' are respectively:

H_{2} O_{2}

oxidises acidified

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solution to blue

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in ether.

An orange coloured solution acidified with $H_{2} S O_{4}$ and treated with a substance'X' gives a blue coloured solution of $C r O_{5}$ .The substance 'X' is :

Acidified solution of chromic acid on treatment with $H_{2} O_{2}$ gives blue colour which is due to -

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When a solution of Na2Cr2O7 is treated with amyl alcohol and acidified H2O2, the layer of amyl alcohol turns blue. What is the blue colouration?

The correct option is A CrO5When a solution of Na2Cr2O7 is treated with amyl alcohol, then, there is formation of the chromate ion.Na2Cr2O7+2OH−→2NaCrO2−4+H2OOn reacting with acidified H2O2 converts to CrO5 to give the blue coloration,Na2CrO4+2H2O2+2H+→CrO5+3H2O+2Na+

When a solution of $N a_{2} C r_{2} O_{7}$ is treated with amyl alcohol and acidified $H_{2} O_{2}$ , the layer of amyl alcohol turns blue. What is the blue colouration?