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Chemistry Blocks > d Block > Flashcards

d Block Flashcards

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1
Q

What groups does it contain?

A

Gp 3 to 12

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2
Q

Which elements are not typical transition elements?

A

Zn,Cd and Hg

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3
Q

D shell sequence for all four periods

A
  1. 1 2 3 5 5 6 7 8 10 10
  2. 1 2 4 5 6 7 8 10 10 10
  3. 1 2 3 4 5 6 7 9 10 10
  4. 1 2 3 4 5 6 7 8 10 10
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4
Q

Which elements have greater ionisation enthalpies?

A

The 2nd and 3rd series have greater atomisation enthalpies than the 1st series

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5
Q

4d and 5d elements are of nearly the same size … why?

A

This is because of poor shielding of 4f electrons.

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6
Q

what is the general trend in density?

A

It increases.

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7
Q

Which three elements have a density less than 5gm/cm^3

A

Sc,Ti and Y

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8
Q

General trend in ionisation enthalpy?

A

It increases along a series.

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9
Q

What is the cause for the irregularity in the 1st ionisation enthalpy of the 3d elements?

A

Removal of one electron alters the energies of the 4s and 3d orbitals and there is some energy reorganisation etc.

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10
Q

Why is the ionisation enthalpy of chromium lower than it’s supposed to be?

A

This is because it doesn’t suffer any change in its d configuration.

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11
Q

Why is the IE of Zn higher?

A

This is because it represents an ionisation from 4s level.

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12
Q

What is required to form the +2 oxidation state?

A
  • The sum of the 1st and 2nd IE

* The enthalpy of atomisation

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13
Q

+2 is the lowest oxidation state for all 3d elements except …?

A

Sc and Cu

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14
Q

Which series has the higher ionisation enthalpies. 4d or 5d .. and why?

A

5d, because of lanthanoid contraction

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15
Q

Which elements have the highest and lowest IE?

A

Highest- Hg

Lowest- La

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16
Q

Which element exhibits the greatest no. of oxidation states?

A

Mn

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17
Q

Elements with a greater no. of oxidation states occur where in the d block.

A

towards the middle

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18
Q

Which element doesn’t exhibit the +2 ox.state?

A

Sc

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19
Q

Higher ox.states become less stable as we move from….

A

The middle of the block to the peripheries.

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20
Q

How is change in ox.state of other elements is different from change in oxidation state in transition metals.

A

In transition metals, ox.states usually vary by unity, whereas , in other elements, it varies by 2.

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21
Q

Mixed oxide are formed by which elements?

A

Mn- Mn304
Fe-Fe304
Co-Co3o4

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22
Q

Which transition element does not exhibit variable oxidation states?

A

Sc

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23
Q

What determines maximum oxidation states?

A

sum of the s and d electrons

24
Q

What is the reason for the irregularity in the E- values in the 3d series?

A

The irregularity in the ionisation enthalpies

25
Q

which ox.state is of little importance to Mn?

A

+3

26
Q

E- values for Ni is related to its …

A

highest hydration enthalpy

27
Q

Which halides are more stable with higher ox.states and which with lower ones?

A

Cl and F - higher

I - Lower

28
Q

Which is more stable in aq. solution. Cu2+ or Cu+?

A

Cu2+ is more stable in aq. medium because of its higher hydration enthalpy which compensates for its IE2.

29
Q

Metals of the 3d series are generally more reactive except …

A

Cu

30
Q

Ti, V and Cr are strong …

A

reducing agents

31
Q

Which kind of substance id repelled by a magnetic field?

A

Diamagnetic

32
Q

Which kind of substance is attracted by a magnetic field?

A

Paramagnetic

33
Q

What kind of substance is strongly attracted to a magnetic field?

A

Ferromagnetic

34
Q

The energy of excitation corresponds to the…

A

frequency of the light absorbed

35
Q

The frequency of light that is absorbed is determined by …?

A
  • Nature of the Ligand
  • Size of the ion
  • ox.state of the ion
36
Q

The reasons for complex formation

A
  • small metal ions
  • High ionic charges
  • Availability of d orbitals
37
Q

Catalysts are more effective cuz…

A
  • of their varaible oxidation states. e.g. Fe3+ catalyses 2I- + 2S2O8^2-.
  • To form complexes
38
Q

Alloys are formed by metals whoses atomic radii and within………… percentage of one another.

A

15%

39
Q

elements involved in

  • brass
  • bronze
A
  • Cu-Zn

* Cu-Sn

40
Q

What kind of oxides do d block elements (except Sc form ?

A

Ionic

41
Q

As the oxidation no. increases, ………………. increases.

A

ionic character

42
Q

Mn2O7 is a green oil and it is ………………..

A

Covalent

43
Q

Acidic character is predominant in

A

higher oxides

44
Q

From which ore is K2Cr2O7 prepared

A

Chromite ore (FeCr2O4)

45
Q

Mn2O7, CrO3, V2O5, CrO, Cr2O3. Classify them as acidic, basic or amphoteric.

A
  • Acidic- Mn2O7, CrO3
  • Basic - CrO
  • Amphoteric- Cr2O3, V2O5
46
Q

……………….. solution of Na2Cr2O7 is filtered and mixed with H2SO4 to give a solution from which …………. Na2Cr2O7.2H2O i obtained.

A
  • Yellow

* Orange

47
Q

Which is more soluble Na2Cr2O7 or K2Cr2O7?

A

Na2Cr2O7

48
Q

Laboratory preparation of MnO4- .

A

2Mn^2+ + 5S2O8^2- + 8H2O = 2MnO4- + 10SO4^2- + 16H+

49
Q

Why are KMnO4 rxns with HCl unsatisfactory?

A

because HCl is oxidised to chorine.

50
Q

Describe the crystals of KMnO4

A

Dark purple, almost black, which are isostructural with those of KClO.

51
Q

Magnetism of manganate and permanganate ions respectively are…?

A

Green Manganate ions are- paramagnetic

Permanganate ions are - diamagnetic

52
Q

how does pi bonding take place in in KMnO4?

A

Overlap pf p orbital of oxygen with d orbital of manganese

53
Q

What transition metal compounds are usually catalysts?

A

Oxides

54
Q

What is used as a catalyst for the hydrogenation of oils?

A

Nickel. (finely divided)

55
Q

What is the catalyst for the contact process?

A

Finely divided platinum, V2O5

Chemistry Blocks (11 decks)

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