Single Choice

The chromate ion in acidic medium changes to ..............

A$$CrO_4^{-2}$$
BCr$$_3$$O$$_{10}^{-2}$$
CCr$$_2$$O$$_7^{-2}$$
Correct Answer
Dnone of these

Solution

Option (C) is correct.
The chromate ion (yellow colour) in acidic medium changes to dichromate ion$$Cr_2O_7^{2-}$$ (orange - red colour). In alkaline medium, reverse happens.
In solution,the dichromate ions convert to chromate ions by the action of a base. Thus chromate ion and dichromate ion exists in equilibrium.

SIMILAR QUESTIONS

d - block and f - block Elements

Potassium dichromate can be prepared by:

d - block and f - block Elements

What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?

d - block and f - block Elements

Potassium dichromate on heating does not gives :

d - block and f - block Elements

How is sodium chromate converted into sodium dichromate in the manufacture of potassium dichromate from chromite ore?

d - block and f - block Elements

Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?

d - block and f - block Elements

Potassium dichromate is prepared from:

d - block and f - block Elements

Which of the following reactions do not result in the preparation of potassium dichromate from chromate? (I) 4$$FeCr_2O_4$$ + 8$$Na_2CO_3$$+ $$7O_2$$$$\rightarrow$$ (II) $$Na_2CrO_4$$ + $$H_2SO_4$$ $$\rightarrow$$ (III) $$Na_2Cr_2O_7$$+ $$2KCl$$$$\rightarrow$$

d - block and f - block Elements

Which of the following compounds is used as the starting material for the preparation of potassium dichromate?

d - block and f - block Elements

Name an ore used in the preparation of potassium dichromate.

d - block and f - block Elements

What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?

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