Chemistry · JEE

Important Questions: Preparation, properties and uses of K2Cr2O7 and KMnO4 for JEE

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The most important Preparation, properties and uses of K2Cr2O7 and KMnO4 questions for JEE cover conceptual traps, standard results, and numerical patterns from Preparation, properties and uses of K2Cr2O7 and KMnO4. Goodmarks provides 10+ high-yield MCQs with full solutions.

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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

S O_{2}

gas?

Q3ChemistryUnit 11: d and f-Block Elements

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

C 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

C r_{2} O_{7}^{2-}

ion reacts with

H_{2} O_{2}

solution in presence of ether solvent?

Q7ChemistryUnit 11: d and f-Block Elements

Assertion

\boldsymbol{S O}_{2}

turns acidified

\boldsymbol{K}_{2} \boldsymbol{C r}_{2} \boldsymbol{O}_{7}

green Reason

K_{2} C r_{2} O_{7}

is reduced to

C r^{3+}(\text { green })

salt by

S O_{2}

Q8ChemistryUnit 11: d and f-Block Elements

To an acidified dichromate solution, a pinch of

N a_{2} O_{2}

and ether is added and shaken.What is observed?

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