Multiple Choice

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

A$$Cr_2O_{7}^{2-}$$ and $$H_{2}O$$ are formed.
Correct Answer
B$$CrO_{7}^{2-}$$ is reduced to $$+3$$ state of $$Cr$$.
Correct Answer
C$$CrO_{7}^{2-}$$ is oxidized to $$+7$$ state of $$Cr$$.
D$$Cr^{3+}$$ and $$Cr_{2}O_{7}^{2-}$$ are formed.

Solution

When potassium chromate is treated with an excess of dilute nitric acid, the following reaction takes place:
$$2K_2CrO_4+2HNO_3\rightarrow K_2Cr_2O_7+2KNO_3+H_2O$$
Oxidation state of $$Cr$$ in $$K_2CrO_4$$ and $$K_2Cr_2O_7$$ is +6.
$$N$$ in $$HNO_3$$ can not be oxidised as it is already present in its highest oxidation state.

SIMILAR QUESTIONS

d - block and f - block Elements

Potassium dichromate can be prepared by:

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

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

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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