Chemistry · JEE

Preparation, properties and uses of K2Cr2O7 and KMnO4 Mock Test for JEE

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Syllabus context

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?

Q9ChemistryUnit 11: d and f-Block Elements

K M n O_{4}

is acidified for redox titrations by:

Q10ChemistryUnit 11: d and f-Block Elements

Assertion NaBO

_{3} / O H^{-}

can be used for oxidation of

C r^{3+}

C r^{6}+

Reason In alkaline medium

N a B O_{3}

produces

\boldsymbol{H}_{2} \boldsymbol{O}_{2}

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