Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 13

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IMPORTANT

Earn 100

Why zinc has the lowest melting point in $3 d$ series?

Important Questions on The d- and f-Block Elements

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Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 14

Why are ionisation energies of

5 d

elements greater than those of

3 d

elements?

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Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-1>Q 15

Why do transition elements show variable oxidation states?

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

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

MEDIUM

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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

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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 +}

.

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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 +}

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

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

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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?