In a dilute alkaline solution, ${\mathrm{MnO}}_4^{-}$  changes to:

Important Questions on The d- and f-Block Elements

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 3

${\mathrm{FeCl}}_3$ dissolves in

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 4

${\mathrm{CrO}}_3$ dissolves in aqueous $\mathrm{NaOH}$ to give

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 5

In the reaction, $2{\mathrm{CuCl}}_2+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{SO}}_2\to \mathrm{A}+{\mathrm{H}}_2{\mathrm{SO}}_4+2\mathrm{HCl}$; $\mathrm{A}$ is

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 6

Ferric sulphate on heating gives:

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 7

At $300°\mathrm{C},{\mathrm{FeCl}}_3$

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 8

Lucas reagent is:

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 9

In the reaction of ${\mathrm{FeSO}}_4$ with ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ in the presence of an acid, the changes in the formal oxidation numbers of $\mathrm{Cr}$ and $\mathrm{Fe},$ respectively, are:

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 10

A filter paper, when soaked in salt $\mathrm{X}$, turns brown when exposed to ${\mathrm{HNO}}_3$ vapour. The salt $\mathrm{X}$ is: