P- block 2

Question 1

Why nitrogen is in gaseous form whereas others are solids? (gp-15)

Answer 1

As the atomicity of nitrogen is less than that of others, Nitrogen can form P pi- P Pi bonds

Question 2

Maximum covalency of Nitrogen is ______

Answer 2

4

Question 3

Metallic character _____ down the group

Answer 3

Increases

Question 4

Why nitrogen can’t form 5 bonds

Answer 4

Absence of vacant D orbital

Question 5

Why heavier elements can’t form ppi-ppi bonds?

Answer 5

Because of their large size, their overlapping becomes inefficient.

Question 6

Common os of grp 15 is

Answer 6

-3 to + 5

Question 7

Why doe down the group os decrease from +5 to +3

Answer 7

Due to inert pair effect

Question 8

Why boiling point of NH3 is more than PH3

Answer 8

Due to Hbonding in NH3

Question 9

Down the group, What all values decrease

Answer 9

1) Bond strength
2) Bond dissociation energy
3) Thermal stability
4) Bond angle
5) Basic character

Question 10

Down the group, what all values increase

Answer 10

1) Metallic character
2) Bond length
3) Reducing character
4) Basic character of OS

Question 11

Preparation of Dinitrogen, Commercially

Answer 11

Liquefication and Fractional distillation

Question 12

Preparation of dinitrogen, In labs-

Answer 12

NH4CL + NANO2 ————> NaCL + N2 + H2O

(NH4)2CR2O7(OEGANE) _____D_____> Cr2O3(GREEN) + N2 + H2O

Question 13

For very pure N2

Answer 13

1) Ba(N3)2———> Ba + N2

2) NaN3———> NA + N2