Nitrogen Family

Question 1

Elements of G 15

Answer 1

N, P, Ar, Sb, Bi

Question 2

Periodicity of G15

Answer 2

2,8,18,18,32

Question 3

G 15
Atomic radii
IE
EN
Bond enthalpy

Answer 3

Increases down the group
Decreases down the group
Decreases down the group
N-N<P-P due to small size - repultion.

Question 4

Metals, non metals of group 15

Answer 4

N, P - metals
As, Sb - metalloids
Bi- Metal

Question 5

Hydrides of G 15

Thermal stabilty
Basic nature
Reducing nature

Answer 5

Decreases down the group
Decreases down the group
Increases down the group

Question 6

Oxides of G15

Acidity of OS
Oxides

Answer 6

E2O5>E2O3 and decrases down the group
N2O3, P2O3 - acidic
As2O3, Sb2O3 - amphoteric
Bi2O3 - basic

Question 7

Only well characterized Bi(V) compound is?
Bond enthalpy and catenation tendency of G 15

Answer 7

BiF5
N triple bond N is highest of all but N-N is less than P-P due to small size -repulsion. Hence catenation tendency is lesser

Question 8

G 15

Halides
Stability of trihalides
Stable trihalide of N
Ionic trihalide

Answer 8

EX3 and EX5
Except of N every other trihalide is stable
Only NF3
BiF3 - rest are covalent

Question 9

Haber’s process

Temp
Pressure
Catalyst
Promoter
Earlier?
Reaction

Answer 9

700 K
200 atm
Finely divided Fe2O3
K2O and Al2O3
Iron
Molybdenum
N2+3H2 –> 2NH3

Question 10

Ostwald process

Temp
Pressure
Catalyst
Reaction
98% conc

Answer 10

500 K
9 bar
Pt/Rh guage
4NH3 + 5O2 –> 4 NO +6H2O
2NO + O2 –> 2NO2
3NO2 + H2O –> 2 HNO3 + NO
Dehydration with H2so3