d - block and f - block Elements
Potassium dichromate can be prepared by:
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Single Choice
Potassium dichromate is prepared from:
Achromate obtained by the fusion of chromite ore with sodium carbonate in free access of air
Correct Answer
Bpyrolusite which is fused with potassium hydroxide in the presence of air
Ciron pyrites by the fusion with potassium carbonate in presence of moisture
Dnone of these
Solution
The potassium chromate can be prepared by chromate ore $$FeCr_2O_4$$.
The various reactions given are:
(i)4$$FeCr_2O_4$$ + 4$$Na_2CO_3$$ +9$$O_2$$ $$\rightarrow$$ $$8NaCrO_4$$ +$$2Fe_2O_3$$ +$$4CO_2$$ (chromite ore).
(ii)$$2Na_2CrO_4$$ +$$H_2SO_4$$ $$\rightarrow$$ $$Na_2Cr_2O_7$$ +$$Na_2SO_4$$ +$$H_2O$$
(iii) $$2Na_2Cr_2O_7$$ +$$2KCl$$ $$\rightarrow$$ $$2K_2Cr_2O_7$$ +$$2NaCl$$
SIMILAR QUESTIONS
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
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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