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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Single Choice
Potassium dichromate can be prepared by:
Aheating $$Na_{2}CrO_{4}$$ solution with $$KCl$$ solution and then cooling
Bheating powdered chromite ore with quicklime in the presence of air
Cheating $$K_{2}CrO_{4}$$ with sulphuric acid
Dboth $$A$$ and $$C$$
Correct Answer
Solution
Potassium dichromate is usually prepared by the reaction of potassium chloride on sodium dichromate.
$$Na_{2}Cr_{2}O_{7}+2KCl \rightarrow K_{2}Cr_{2}O_{7}+2NaCl$$
It can also be prepared by heating $$K_{2}CrO_{4}$$ with $$H_{2}SO_{4}$$.
$$2K_{2}CrO_{4}+2H^+ \rightarrow K_{2}Cr_{2}O_{7}+2K^++H_{2}O$$
Hence, option D is correct.
SIMILAR QUESTIONS
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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