Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 16

EASY

JEE Main/Advance

IMPORTANT

Earn 100

What is the most common oxidation state of first transition series?

Important Questions on The d- and f-Block Elements

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 17

Name the three factors which determine the stability of particular oxidation state.

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 18

Explain why the

E °

value for the

{Mn}^{3 +} / {Mn}^{2 +}

couple is much more positive than that for

{Cr}^{3 +} /

{Cr}^{2 +}

or

{Fe}^{3 +} / {Fe}^{2 +}

.

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 20

Which of the following ions would form (

i

) coloured and (

ii

) colourless complexes in water?

{Cu}^{2 +}, {Zn}^{2 +}, {Ti}^{3 +}, {Ti}^{+ 4}, {Cd}^{2 +}, {Mn}^{2 +}

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 21

Why ${Ti}^{+ 4}$ complexes are diamagnetic?

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 22

A substance is found to have a magnetic moment of $3.9 BM$ . How many unpaired electrons does it contain?

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 23

Explain by giving reason.
(a) Transition metals and many of their compounds show paramagnetic behaviour.
(b) The enthalpies of atomisation of the transition metals are high.
(c) The transition metals generally form coloured compounds.

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 26

Why ${KMnO}_{4}$ is stored in dark bottle and what happens to it's acidic solution?

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 27

Why does

{AgNO}_{3}

produce a black stain on the skin?