P block elements

Question 1

How many grps are in p block

Answer 1

6

Question 2

The exception of p block electronic configuration is

Answer 2

He

Question 3

The maximum oxidation number of p block is

Answer 3

Total number of valence electrons in s and p

Question 4

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

Answer 4

Inert pair effect

Question 5

For heavier elements the stable oxidation state would be

Answer 5

Two unit less than grp oxidation state

Question 6

Where in the periodic table does non Metals and metalloids exist

Answer 6

P block

Question 7

Which has higher ionization enthalpy and high electronegativity

Answer 7

Non metals

Question 8

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

Answer 8

True

Question 9

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

Answer 9

True

Question 10

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

Answer 10

True

Question 11

Boron occurs as

Answer 11

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

Question 12

Important ore of aluminium is

Answer 12

Bauxite Al2O3.2H20
Cryolite Na3AlF6

Question 13

The atomic radius of Ga is less than that of Al

Answer 13

Due to Poor screening effect

Question 14

The reason for decrease in ionization enthalpy between B and Al

Answer 14

Increase in size

Question 15

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

Answer 15

Low screening effect of d and f electrons

Question 16

The electronegativity in 13th grp decreases from

Answer 16

B to Al

Question 17

The electronegativity in 13th grp Increases from

Answer 17

Al to Tl

Question 18

Tendency to form Lewis acid decreases with

Answer 18

Increase in size down the grp

Question 19

AlCl3 achieves stability as a dimer

Answer 19

True

Question 20

Boron is reactive in chtystalline form

Answer 20

False

Question 21

Amorphous Boron is reactive

Answer 21

True

Question 22

Boron trioxide is

Answer 22

Acidic in natureb

Question 23

Aluminium and Gallium oxides

Answer 23

Amphoteric oxides

Question 24

Indium and thallium oxides are

Answer 24

Basic

Question 25

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

Answer 25

True

Question 26

P block elements react with halogens to form

Answer 26

Trihalides ( except Tl I3)

Question 27

White fumes appear around-the-bottle of

Answer 27

Anhydrous aluminium chloride

Question 28

Carbon is

Answer 28

17th most abundant

Question 29

Which 14 grp element exist as traces

Answer 29

Germanium

Question 30

Tin occurs mainly as

Answer 30

Casseterite ( SnO2)

Question 31

Lead occurs mainly as

Answer 31

Galena ( PbS)

Question 32

Considerable increase in covalent radius from

Answer 32

C to Si

Question 33

Small increase in covalent radius from

Answer 33

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

Question 34

Ionization enthalpy of grp 14 elements is

Answer 34

More than that of 13 elements

Question 35

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

Answer 35

True

Question 36

SiO2 and GeO2 is

Answer 36

Acidic

Question 37

Arsenic and antimony are

Answer 37

Metalliods

Question 38

Bismuth is

Answer 38

Metal

Question 39

Considerable increase in Ionic radii in grp 15 from

Answer 39

N to P

Question 40

Small increase in Ionic radii from

Answer 40

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

Question 41

Grp 15 elements have higher ionization enthalpy than

Answer 41

Grp 14

Question 42

With increasing atomic radii electronegativity

Answer 42

Decreases

Question 43

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

Answer 43

Nitrogen

Question 44

Melting point in grp 15 elements increases

Answer 44

Upto arsenic and then decreases upto bismuth

Question 45

The boiling point of 15th grp element

Answer 45

Increases down the grp

Question 46

Common oxidation state of 15th grp element

Answer 46

-3, +3, +5

Question 47

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

Answer 47

+1 to +4

Question 48

Max covalency of Nitrogen is

Answer 48

4

Question 49

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

Answer 49

+3

Question 50

Heavier metals of grp 15 does not form

Answer 50

P pi p pi bond

Question 51

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

Answer 51

True

Question 52

Catenation tendency of Nitrogen is

Answer 52

Weak

Question 53

Stability of hydride in grp 15 is

Answer 53

Decreases from NH3 to BiH3

Question 54

WHich is high reducing agent NH3 or BiH3 ?

Answer 54

BiH3

Question 55

Order of basicity in grp 15 elements

Answer 55

Decreases from NH3 to BiH3

Question 56

Higher oxidation state oxides are more

Answer 56

Acidic

Question 57

Grp 15 elements show what type of oxides

Answer 57

E2O3 and E2O5

Question 58

Nitrogen does not form pentahalides due to

Answer 58

Unavailability of d orbital

Question 59

Pentahalides are more which property than trihalides

Answer 59

Covalency

Question 60

The only stable trihalide of N

Answer 60

NF3

Question 61

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

Answer 61

Both are corect

Question 62

SbOCl colour

Answer 62

Orange

Question 63

BiOCl

Answer 63

White

Question 64

Halides are hydrolyzed in water to form

Answer 64

Oxyacids and oxychlorides

Question 65

Grp 15 elements react with metals in which ox state

Answer 65

-3

Question 66

The most basic trihalide of Nitrogen is

Answer 66

NI3

Question 67

The bond angle of hydride in p block

Answer 67

Decreases that is NH3 has greatest and BiH3 has least

Question 68

Nitrogen is chemically inert because

Answer 68

Of high bond energy

Question 69

Grp 16 elements are

Answer 69

Chalcogens

Question 70

Chalcogens are known as such because they form

Answer 70

A major component of ore are oxides or sulphides

Question 71

The negative value of electron gain enthalpy in 16th grp

Answer 71

Decreases down the grp

Question 72

Radioactive grp 16 element

Answer 72

Polonium

Question 73

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

Answer 73

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

Question 74

Catenation is predominantly present in grp 16

Answer 74

Sulfur( S-S bond in cystein)

Question 75

Which 16th grp element is used in photoconductivity

Answer 75

Selenium

Question 76

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

Answer 76

Decreases

Question 77

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

Answer 77

Dectease down the grp ( inert pair effect)

Question 78

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

Answer 78

Increases down the grp ( inert pair effect)

Question 79

HNO3 oxidizes Sulphur to H2SO4 but only oxidize selenium to H2SeO3

Answer 79

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

Question 80

Oxygen does not directly react with

Answer 80

Chlorine