All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 24

EASY

12th ICSE

IMPORTANT

Earn 100

Explain why ${Cr}_{2} {O_{7}}^{2 -}$ ion is a powerful oxidant in acidic medium but weak oxidant in basic medium?

Important Questions on d-and f-Block Elements

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 25

In the titration of

{Fe}^{2 +}

ion in

{KMnO}_{4}

in acidic medium, dilute

H_{2} {SO}_{4}

is used but not the dilute

HCl

. Why?

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 25

Arrange the following oxides of Mn in the order of their decreasing acidic nature.

$MnO, {Mn}_{2} O_{3}, {Mn}_{3} O_{4}, {MnO}_{2}, {Mn}_{2} O_{7}$ .

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 26

What happens when

H_{2} S

reacts with the acidified

K_{2} {Cr}_{2} O_{7}

solutions?

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 26

Ethanol is oxidised with acidified

K_{2} {Cr}_{2} O_{7}

solution?

MEDIUM

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 27

How would you account for the following: (i) Copper (I) is diamagnetic, whereas Copper(II) is paramagnetic.

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 27

What is the common oxidation state of

Cu, Ag, Au

?

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 27

How would you account for the following: The

d^{1}

configuration is very unstable in ions.

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 28

Give examples and suggest reasons for the following features of the transition metal chemistry. The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.