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Chemistry > d & f Block Elements > Flashcards

d & f Block Elements Flashcards

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0
Q

Zn Cd Hg are not typical d block elements because

A

They have completely filled d orbitals in their ground state as well da in their common oxidation state.

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1
Q

d block includes the groups

A

3-12

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2
Q

General E.C of d block elements is

A

(n-1)d^1-10 ns0-2

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3
Q

Which transition metals do not have a typical metallic structure at normal temp

A

Zn Cd Hg Mn

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4
Q

Trend of enthalpy of atomisation and mp in d block

A

Rises upto d5 and falls regularly as atomic number increases

Except anamolous Mn and Tc

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5
Q

What is lanthanides contraction?

A

Filling of 4f electron before 5d results in a regular decrease in atomic radii

Hence, 4d & 5f series exhibit similar radii and properties

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6
Q

The transition metal which does not show variable o.s

A

Sc

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7
Q

Transition metals which exhibit o.s of +8

A

Rh and Os

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8
Q

Why higher o.s are stable with O and F

A

Due to high oxidising power of F &O

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9
Q

Tendency to form divalent cations decreases across the series because of

A

Increase in reduction potential from left to right

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10
Q

Strongest oxidising agents in aq solutions are

A

Mn3+ and Co3+

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11
Q

Frequency of light absorbed is determined by

A

Nature of ligand
Size of metal ion
Oxidation state of metal

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12
Q

Colour may be due to

A 
d-d transition
Charge transfer spectra
Eg:-(MnO4- is pink)
Polarisation
Eg:-(AgBr AgI)
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13
Q

Transition metals show catalytic properties because of their ability to

A

Form complex compounds

Adopt multiple oxidation states

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14
Q

Fe is used to catalyse

A

Haber process

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15
Q

PdCl2 catalyses

A

Wacker process

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16
Q

Adams catalyst is

A

Pt/PtO2

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17
Q

Lowest melting point metals among transition metals belong to

A

Group 12

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18
Q

Most abundant transition metal is

A

Iron

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19
Q

All metals form ionic metal oxides except

A

Sc

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20
Q

Nature of higher oxides is predominantly

A

Acidic

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21
Q

Cr2O3 and V2O5 are

A

Amphoteric oxides

CrO is basic

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22
Q

Chromite is

A

FeCr2O4

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23
Q

Potassium dichromate is used in

A

Leather industry and in preparation of azo compounds

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24
Q

Colour of sodium dichromate(Na2Cr2O7.2H2O) is

A

Orange

Na2Cr2O7 is more soluble than K2Cr2O7

25
Q

CrO4- and Cr2O72- exist in eq at pH=?

A

4

26
Q

Commercially potassium permanganate is prepared by

A

Oxidative fusion of MnO2 followed by electrolytic oxidation of manganate

27
Q

CrO5 is stable only in

A

Ether or pyridine

In aq solution it decomposes to dioxygen and Cr3+

28
Q

Chromyl chloride test of for

A

Presence of chloride ion

29
Q

Oxidation state of Mn in KMnO4 in acidic basic and neutral media are

A

Acid. +2
Base +6
Neutral +4

30
Q

Magnetic behaviour of permangnate ion is

A

Diamagnetic

Green manganate ion is paramagnetic

31
Q

When ferrous chloride is added to potassium ferrocyanide there is formation of

A

Prussian blue

32
Q

How does atomic size vary in lanthanides

A

Decreases from La to Lu

33
Q

Most common o.s in lanthanides

A

+2 & +3

+4 is exhibited by Pr Nd Tb Dy in MO2 oxide

34
Q

Hardest lanthanides is

A

Sm(62)

35
Q

Trivalent lanthanide ions are coloured both in solid and liq state due to

A

Presence of f electrons

36
Q

Best Use of lanthanoid

A

Production of alloy Steel

37
Q

What is Mischmetal used for?

A

To form bullets

It contains a lanthanoid metal[95%] Iron[5%] and traces of 
S
C
Ca
Al
38
Q

Mixed oxides of lanthanoids are used in

A

Petroleum cracking

39
Q

Which lanthanide has maximum paramagnetism in +3 state?

A

Gd

40
Q

Lawrencium has a half life of

A

3 min

41
Q

In which inner transition element electron is not added to the f orbital

A

Th

42
Q

How do actinoids react with acids and alkali

A

HCl reacts with all actinoids
Most are slightly affected by HNO3 as formation of a protective oxide layer occurs
But alkali have no action

43
Q

Actinoids are coloured due to

A

Charge transfer or f-f transition

44
Q

Lightest transition element is

A

Sc

45
Q

Densest transition element is

A

Os

46
Q

Verdigris is

A

Basic copper acetate

(CH3COO)2Cu.Cu(OH)2

47
Q

Gold is soluble in which transition metal?

A

He

48
Q

What is purple of Cassius ?

A

Colloidal gold

Very dil. gold chloride +SnCl2

49
Q

What is fulminating gold ?

A

Au(NH2)=NH

50
Q

Zn becomes malleable and ductile at

A

100c

51
Q

How do monovalent mercurous ions exist

A

As dimers

52
Q

Philosophers wool is

A

ZnO

Also called zinc white or Chinese white

It gives green mass in cobalt chloride test…turns yellow on heating white on cooling

53
Q

Calomel is

A

Hg2Cl2

54
Q

Corrosive sublimate is

A

HgCl2

55
Q

Vermillion is

A

Mercuric sulphide (HgS)

56
Q

Hg does not form amalgam with

A

Fe and Pt

57
Q

Pharaohs serpent is

A

Mercury fulminate (Hg(ONC)2)

It is used as explosive

58
Q

Mixture of TiO2 and BaSO4 is called

A

Titanox

59
Q

Lithopone is

A

ZnS+BaSO4

60
Q

Nesslers reagent(K2[HgI4]) is used to detect

A

NH3

Chemistry (3 decks)

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