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

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IMPORTANT

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In the reaction of ${FeSO}_{4}$ with $K_{2} {Cr}_{2} O_{7}$ in the presence of an acid, the changes in the formal oxidation numbers of $Cr$ and $Fe,$ respectively, are:

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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 10

A filter paper, when soaked in salt

X

, turns brown when exposed to

{HNO}_{3}

vapour. The salt

X

is:

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 11

In the dichromate dianion:

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 12

When $I^{-}$ is oxidised by ${MnO}_{4}^{-}$ in an alkaline medium, $I^{-}$ converts into.

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 13

The formula of corrosive sublimate is

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 14

The explosive compound among the following is:

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 15

If

{KMnO}_{4}

is fused with hot

KOH

, then the product formed is:

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 16

The number of chromium-oxygen bonds (Sigma as well as pi) formed by one chromium atom in dichromate ion

({Cr}_{2} O_{7}^{2 -})

is [Ignore Back Bonding]?

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Chemistry Crash Course NEET>Chapter 19 - The d- and f-Block Elements>Level 3>Q 17

Acidified potassium dichromate is treated with hydrogen sulphide. In the reaction, the oxidation number of chromium