P Block 3

Question 1

Electronegativity tricks of P block Elements

Answer 1

draw Bhalla in the first two groups of the P blocks and then a little variation with the Bhalla being pressed downwards and then the last two will be pointed downwards like a sword

that would be the variations of elements

from the 3rd line
there would be 
less
more
more

meaning the element will be Less/more compared to the diagonal in the upward period

Question 2

trick for memorizing the names of oxyacids of phosphorous

Answer 2

draw the table and then match the things thats asked

Question 3

metaphosphoric acid structure

Answer 3

Question 4

Zeolites in which form and what does it do to hard water

Answer 4

hydrated zeolites are used as ion exchangers in softening of hard water

Question 5

The basic structural unit of silicates is

Answer 5

SiO4 4-

Question 6

Except for what element in grp 15 all the others show allotropy

Answer 6

N

Question 7

What P and As compounds act as ligands and what kind of bond does it forms?!

Answer 7

dπ-dπ

Question 8

Hydrides of grp 15 thermal stability, bond dissociation, basicity, reducing character, bond angle order

Answer 8

Question 9

What oxides in grp 15 are amphoteric

Answer 9

arsenic and antimony

Question 10

Which halide is covalent? pentalhalide or trihalide and why

Answer 10

pentahalide is more covalent because it has the O.S of the elements as 5 where as trihalides have O.S 3

Question 11

PCl5 exists in the solid-state as

and why is it different than compared to PBr5

Answer 11

because Br is heavier and bigger and it would be difficult to accommodate Br around P as compared to Cl around P

Question 12

Which only nitrogen halide is known stable

Answer 12

NF3

Question 13

Very pure dinitrogen is obtained by

Answer 13

Question 14

Dinitrogen is reactive/inert at room temperature and why?!

Answer 14

dinitrogen is inert at room temperature because of high enthalpy of the triple bond of N-N

Question 15

N2 and O2 combines to form ___ at what condition

Answer 15

N2 and O2 combines to form NO at very high temperature*(2000K)

Question 16

Urea formula

Answer 16

NH2CONH2

Question 17

How forming ammonia with Urea

Answer 17

Question 18

Catalyst used in habers process

Answer 18

K2O and Al2O3

Question 19

What is used as an refrigent

Answer 19

liquid ammonia

Question 20

Why does NH3 act as a lewis base

Answer 20

nitrogen atom in NH3 has one lone pair of electron which is available for donation

Question 21

Cu2+ with Ammonia forms which complex and whats the color?

Answer 21

deep blue since Cu2+ has blue color

Question 22

Nitrogen Oxides table

Answer 22

Question 23

Nitrogen oxides structure

Answer 23

Question 24

What kind of bonds does N2O5 has

Answer 24

covalent and coordinate covalent bonds

Question 25

NH3 can be dried by?

Answer 25

by passing over fresh quicklime(CaO) or soda lime(NaOH & CaO)

Question 26

Ammonia with sodium hypochlorite?

Answer 26

Question 27

NaNO3 with H2SO4

Answer 27

Question 28

Boiling point of the grp 15 hydrides

Answer 28

Question 29

different type of oxides of grp15 thermal stability with acidity

Answer 29

Question 30

PBr5 exis in the solid stae as

Answer 30

[PBr4]^+ Br^-

Question 31

BiF3 is predominantly ionic or covalent?

Answer 31

inoic

Question 32

NH4Cl + Ca(OH)2 forms

Answer 32

Question 33

ammonoium sulfate with sodium hydroxide forms

Answer 33

Question 34

why does NO2 dimerises

Answer 34

NO2 has an odd number of electrons and by dimerisation it is converted to a stable N2O4 molecule with even electrons

Question 35

brown ring test compound and the O.S of Fe, NO

Answer 35

O.S. of Fe:- +1 O.S. of NO:- +1

Question 36

whats a component of lead storage batteries and is also a amphoteric and strongly oxidizing agent

Answer 36

PbO2

Question 37

why does SiCl6 ^2- doesn't exists?

Answer 37

steric crowding around the atom

Question 38

treated with CO2 forms

Answer 38

Question 39

crystalline forms of silica name

Answer 39

quartz, tridymite and cristobalite

Question 40

amorphous form of silica eg

Answer 40

kieselguhr

Question 41

BH3is electron-deficient or electron sufficient compound and how does it behave(lewis acid or base)

Answer 41

its electron deficient and is a lewis acid

Question 42

why is the carbon atoms' lateral overlapping of 2pand 2p most effective

Answer 42

because it has a small size

Question 43

eg of a 3-dimensional silicate?

Answer 43

feldspars

Question 44

trialkylchlorosilane on hydrolysis gives?

Answer 44

Question 45

CaF2 with SiO2+H2SO4 forms?

Answer 45