Subjective Type

Orange colour of $$Cr_{2}O_{7}^{2-}$$ ion changes to yellow when treated with an alkali. Why?

Solution

Orange colour of $$Cr_{2}O_{7}^{2-}$$ ion changes to yellow when treated with an alkali due to formation of chromate ion which is yellow in colour.

$$\underset{\overset{Dichromate\ ion}{(Orange)}}{Cr_{2}O_{7}^{2-}} + 2OH^{-}\rightarrow 2\underset{\overset{Chromate\ ion}{(Yellow)}}{CrO_{4}^{2-}} + H_{2}O$$

SIMILAR QUESTIONS

d - block and f - block Elements

In the dichromatie anion.

d - block and f - block Elements

Zinc chromate and lead chromate are used as:

d - block and f - block Elements

In the dichromate dianoin:

d - block and f - block Elements

The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is ________.

d - block and f - block Elements

The ionic charges on chromate ion and dichromate ion respectively is:

d - block and f - block Elements

Chrome yellow is chemically known as

d - block and f - block Elements

How do you prepare: $$Na_{2}Cr_{2}O_{7}$$ from $$Na_{2}CrO_{4}$$?

d - block and f - block Elements

Account for: $$Cr^{2+}$$ is a strong reducing agent.

d - block and f - block Elements

Draw the structures of chromate and dichromate ions.

d - block and f - block Elements

On heating chromite $$(FeCr_2O_4)$$ with $$Na_2CO_3$$ in air, the following product is obtained:

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