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Chemistry Inorganic > P block elements > Flashcards

P block elements Flashcards

1
Q

How many grps are in p block

A

6

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2
Q

The exception of p block electronic configuration is

A

He

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3
Q

The maximum oxidation number of p block is

A

Total number of valence electrons in s and p

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4
Q

The occurrence of oxidation state two units less than the grp oxidation state is because of

A

Inert pair effect

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5
Q

For heavier elements the stable oxidation state would be

A

Two unit less than grp oxidation state

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6
Q

Where in the periodic table does non Metals and metalloids exist

A

P block

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7
Q

Which has higher ionization enthalpy and high electronegativity

A

Non metals

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8
Q

The first members of p block difrers from other members in their ability to form p pi = p pi bonds

A

True

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9
Q

The heavier elements of p block forms p pi = d pi bonds or d pi= d pi bonds

A

True

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10
Q

As d orbitals are of high energy they contribute less to the stability of the molecules than p pi = P pi bond

A

True

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11
Q

Boron occurs as

A

Orthoboric acid ( H3BO3)
Kernite Na2B4O7.4 H2O
Borax Na2B4O7. 10 H20

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12
Q

Important ore of aluminium is

A

Bauxite Al2O3.2H20
Cryolite Na3AlF6

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13
Q

The atomic radius of Ga is less than that of Al

A

Due to Poor screening effect

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14
Q

The reason for decrease in ionization enthalpy between B and Al

A

Increase in size

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15
Q

The reason for decrease in ionization enthalpy Al and Ga, In and Tl is due to

A

Low screening effect of d and f electrons

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16
Q

The electronegativity in 13th grp decreases from

A

B to Al

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17
Q

The electronegativity in 13th grp Increases from

A

Al to Tl

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18
Q

Tendency to form Lewis acid decreases with

A

Increase in size down the grp

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19
Q

AlCl3 achieves stability as a dimer

A

True

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20
Q

Boron is reactive in chtystalline form

A

False

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21
Q

Amorphous Boron is reactive

A

True

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22
Q

Boron trioxide is

A

Acidic in natureb

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23
Q

Aluminium and Gallium oxides

A

Amphoteric oxides

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24
Q

Indium and thallium oxides are

A

Basic

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25
Q

Concentrated nitric acid renders aluminum passive by forming a protective oxide layer

A

True

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26
Q

P block elements react with halogens to form

A

Trihalides ( except Tl I3)

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27
Q

White fumes appear around-the-bottle of

A

Anhydrous aluminium chloride

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28
Q

Carbon is

A

17th most abundant

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29
Q

Which 14 grp element exist as traces

A

Germanium

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30
Q

Tin occurs mainly as

A

Casseterite ( SnO2)

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31
Q

Lead occurs mainly as

A

Galena ( PbS)

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32
Q

Considerable increase in covalent radius from

A

C to Si

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33
Q

Small increase in covalent radius from

A

Si to pb ( due to completely filled D and f orbitals in heavier metals)

34
Q

Ionization enthalpy of grp 14 elements is

A

More than that of 13 elements

35
Q

Due to Small size elements of 14 grp element are more electronegative than 13 grp element

A

True

36
Q

SiO2 and GeO2 is

A

Acidic

37
Q

Arsenic and antimony are

A

Metalliods

38
Q

Bismuth is

A

Metal

39
Q

Considerable increase in Ionic radii in grp 15 from

A

N to P

40
Q

Small increase in Ionic radii from

A

As to Bi ( completely filled D and f orbitals in heavier members )

41
Q

Grp 15 elements have higher ionization enthalpy than

A

Grp 14

42
Q

With increasing atomic radii electronegativity

A

Decreases

43
Q

Except which element all the others show alloptropy in grp 15 elements

A

Nitrogen

44
Q

Melting point in grp 15 elements increases

A

Upto arsenic and then decreases upto bismuth

45
Q

The boiling point of 15th grp element

A

Increases down the grp

46
Q

Common oxidation state of 15th grp element

A

-3, +3, +5

47
Q

Oxidation states of Nitrogen that tend to undergo disproportion in acidic medium

A

+1 to +4

48
Q

Max covalency of Nitrogen is

A

4

49
Q

Which oxidation state with resp to As, Sb, Bi is more stable in disproportionately

A

+3

50
Q

Heavier metals of grp 15 does not form

A

P pi p pi bond

51
Q

Single N- N bond is weaker than single P-P bond

A

True

52
Q

Catenation tendency of Nitrogen is

A

Weak

53
Q

Stability of hydride in grp 15 is

A

Decreases from NH3 to BiH3

54
Q

WHich is high reducing agent NH3 or BiH3 ?

A

BiH3

55
Q

Order of basicity in grp 15 elements

A

Decreases from NH3 to BiH3

56
Q

Higher oxidation state oxides are more

A

Acidic

57
Q

Grp 15 elements show what type of oxides

A

E2O3 and E2O5

58
Q

Nitrogen does not form pentahalides due to

A

Unavailability of d orbital

59
Q

Pentahalides are more which property than trihalides

A

Covalency

60
Q

The only stable trihalide of N

A

NF3

61
Q

A: all trihalides except that of N are stBle
R: trihalides except BF3 are covalent in nature

A

Both are corect

62
Q

SbOCl colour

A

Orange

63
Q

BiOCl

A

White

64
Q

Halides are hydrolyzed in water to form

A

Oxyacids and oxychlorides

65
Q

Grp 15 elements react with metals in which ox state

A

-3

66
Q

The most basic trihalide of Nitrogen is

A

NI3

67
Q

The bond angle of hydride in p block

A

Decreases that is NH3 has greatest and BiH3 has least

68
Q

Nitrogen is chemically inert because

A

Of high bond energy

69
Q

Grp 16 elements are

A

Chalcogens

70
Q

Chalcogens are known as such because they form

A

A major component of ore are oxides or sulphides

71
Q

The negative value of electron gain enthalpy in 16th grp

A

Decreases down the grp

72
Q

Radioactive grp 16 element

A

Polonium

73
Q

Large diffrence in boiling and melting point exist between in grp 16

A

Oxygen and sulfur( explained on the basis of their atomicity oxygen is diatomic while sulfur is polyatomic

74
Q

Catenation is predominantly present in grp 16

A

Sulfur( S-S bond in cystein)

75
Q

Which 16th grp element is used in photoconductivity

A

Selenium

76
Q

The stability of -2 oxidation state down the grp(16)

A

Decreases

77
Q

The stability of +6 oxidation state( 16th grp)

A

Dectease down the grp ( inert pair effect)

78
Q

The stability of +4 oxidation state(16th grp)

A

Increases down the grp ( inert pair effect)

79
Q

HNO3 oxidizes Sulphur to H2SO4 but only oxidize selenium to H2SeO3

A

As the atoms are smaller and due to Poor shielding effect of 3d electrons the electrons are more tightly held with nucleus

80
Q
A

Chemistry Inorganic (14 decks)

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