Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Chem > p Block > Flashcards

p Block Flashcards

1
Q

15th group elements

A

pnictogen or nitrogen family

N, P, As, Sb, Bi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Group 16

A

Chalcogen family

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

17th group

A

Halogen family

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

18th group

A

Inert gases family

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Non-metals in group 15

A

Nitrogen and phosphorus

N - 1s² 2s² 2p³
P - [Ne] 3s² 3p³

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Metalloids in group 15

A

Arsenic and antimony

As - [Ar] 3d¹⁰ 4s² 4p³
Sb - [Kr] 4d¹⁰ 5s² 5p³

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Metal in group 15

A

Bismuth

Bi - [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Bond enthalpy of nitrogen

A

941kJ/mol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Properties of nitrogen

A
  • has pπ - pπ strong bond and exist as N2 gas
  • Bond enthalpy 941kJ/mol
  • has low catenating capacity, ie self linking capacity
  • Max covalency of nitrogen: 4
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Reactivity of group 15

A
  • N2 is the least reactive
  • P4 (white phosphorus) is the most reactive
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Oxides of group 15

A

Forms oxides of the formula E₂O₃ and E₂O₅

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Amphoteric oxides in grp 15

A
  • As₂O₃
  • Sb₂O₃
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Acidic oxides in grp 15

A
  • N₂O₃
  • P₂O₃
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Basic oxides in grp 15

A

Bi₂O₃

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Which is the only stable halide formed by grp 15?

A

NF₃

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Why does nitrogen not form pentahalide?

A

Due to the absence of d orbital

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Common oxidation states of grp 15

A

-3, +3, +5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

How do the elements exist in grp 15

A
  • nitrogen as diatomic gas
  • all other elements as tetravalent solids
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Bond dissociation enthalpy in Halogens

A

Cl-Cl > Br-Br > F-F > I-I

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Why does F₂ have low bond dissociation enthalpy?

A

Due to strong l.p - l.p repulsion b/w two F atoms having short bond length

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Melting point of the elements in grp 15

A

Increases from N to As and then decreases to Bi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Oxidation state of Bismuth

A

Bismuth exists in +3 oxidation state due to inert pair effect except for
BiF₅

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Acidic nature of group 16

A

H₂O < H₂S < H₂Se < H₂Te

Becuz H-E bond length increases down the group and bond dissociation enthalpy decreases down the group

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Oxides formed by group 16

A
  • They form oxides of formulas EO₂ and EO₃ except O₂
  • their trioxides and more acidic than dioxides
  • SO₂ and SO₃ are gases
  • SeO₂ solid
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Reducing property in group 16 oxides
Reducing property decreases from SO₂ to TeO₂ - TeO₂: oxidising agent - SO₂: reducing agent
26
Cryolite
Na₃AlF₆
27
✨Stability of Hydrides of group 15
NH₃ > PH₃ > AsH₃ > SbH₃ > BiH₃ *Decreases down the group*
28
**True or False** Single N-N bond is weaker than the single P-P bond due to high inter electronic repulsion of the non-bonding electrons, owing to the small bond length.
True
29
Baryte
BaSO₄
30
Indian saltpeter
KNO₃
31
Zinc Blende
ZnS
32
Halogen which is liquid at room temperature
Bromine
33
Strongest oxidising agent
Fluorine
34
Order of boiling point of Hydrides of Halogens
HF > HI > HBr > HCl *HF has high B.P due to strong intermolecular H-bonding*
35
Occurence of grp 18
All elements except Radon (Rn) occur in the atmosphere
36
Most abundant noble gas
- He: in the universe - Ar: in our atmosphere
37
Which element has the lowest Boiling point of all known substances?
Helium (He)
38
Argon and Krypton have identical electron gain enthalpy. True or false
True
39
Which two noble gases have similar ionisation enthalpy
Oxygen and Xenon have comparable first ionisation enthalpy
40
Elements which does not react with fluorine
Helium, neon and argon
41
Name few neutral oxides?
NO and N₂O
42
Epsom salt formula
MgSO₄·7H2O
43
Heaviest member and synthetic element among chalcogen
livermorium (Lv)
44
Elements of grp 16
O: oxygen S: sulphur Se: selenium Te: tellurium Po: polonium
45
Strongest reducing agent in group 15
BiH₃
46
Why do grp 16 elements have lower ionisation enthalpy than corresponding grp 15 elements?
Half filled p-orbitals in group 15 elements are more stable (ns² np³)
47
Most electronegative element in the periodic table
Fluorine
48
Which grp elements have the smallest radii in their corresponding periods?
Halogens have the smallest radius in a period *Due to increase in Zeff*
49
Gas used in gas-cooled nuclear reactors
Helium
50
Which radioactive element decays to give two inert gases?
Radium Ra --> He + Rn *Gives helium and radon*
51
Ionisation enthalpy of grp 15 elements
- decreases down the group due to increase in atomic size - is higher than that of corresponding grp 14 elements
52
Name a colourless explosive solid
XeO₃
53
Order of melting point of Hydrides of group 16
H2O > H2Te > H2Se > H2S
54
Color of ozone in solid state
Violet black
55
Properties of ozone
- diamagnetic gas - bent shape - violet black colour in solid state
56
Properties of NO
- neutral dioxide - bond order 2.5
57
How does silicon exist in solid state?
They exist as covalent crystals in solid state
58
**A:** nitrogen and oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen **R:** reaction between nitrogen and oxygen requires high temp
Both A and R are correct and R is the correct explanation of A
59
Why is ICl more reactive than I₂?
I-Cl bond is weaker than I-I bond due to difference in electronegativity b/w the atoms
60
Catalysts in these processes i) Ziegler-Natta polymerization ii) Wacker process iii) Deacon's process iv) Contact process
- TiCl₃: Ziegler-Natta - PdCl₂: Wacker process - CuCl₂: Deacon's process - V₂O₅: contact process
61
Reaction of zinc with nitric acid
- dilute: N₂O - conc: NO₂
62
Products obtained when chlorine gas reacts with cold dilute aqueous NaOH
Cl- and ClO-

Chem (14 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions