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Preparation, properties and uses of K2Cr2O7 and KMnO4 Previous Year Questions for JEE

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Part of d and f-Block Elements in JEE Main Chemistry.

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Q1ChemistryUnit 11: d and f-Block Elements
In the purification of zirconium by Van Arkel process which halogen is used?
Q2ChemistryUnit 11: d and f-Block Elements
Which of the following reagents is used to test the presence of SO2S O_{2} gas?
Q3ChemistryUnit 11: d and f-Block Elements
ACrO42−A C r O_{4}^{2-} solution turns from yellow to another color upon addition of acid. What is the another color?
Q4ChemistryUnit 11: d and f-Block Elements
In the dichromate anion Cr2O7C r_{2} O_{7}
Q5ChemistryUnit 11: d and f-Block Elements
Which represents correct comparison of the stability of ions?
Q6ChemistryUnit 11: d and f-Block Elements
What changes occur when acidified Cr2O72−C r_{2} O_{7}^{2-} ion reacts with H2O2H_{2} O_{2} solution in presence of ether solvent?
Q7ChemistryUnit 11: d and f-Block Elements
Assertion SO2\boldsymbol{S O}_{2} turns acidified K2Cr2O7\boldsymbol{K}_{2} \boldsymbol{C r}_{2} \boldsymbol{O}_{7} green Reason K2Cr2O7K_{2} C r_{2} O_{7} is reduced to Cr3+( green )C r^{3+}(\text { green }) salt by SO2S O_{2}
Q8ChemistryUnit 11: d and f-Block Elements
To an acidified dichromate solution, a pinch of Na2O2N a_{2} O_{2} and ether is added and shaken.What is observed?

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