P Block 4

Question 1

trick for sulphur oxacids names

Answer 1

Question 2

trick for sulphur oxacids structures

Answer 2

learn these two structures and then compare the structure given with the number of S in the compound
if 2S then see the right structure and play with that and if 1S then see the LEft one

compare the structure that matches with the one asked with the number of O pissing

if there are more numbers of O then add it in between the S-S

and if there are less number of O then remove the O from S

and one exception is in H2SO5

add O in between S and OH

https://www.youtube.com/watch?v=1th_jpRAEZs&list=PLHEUDUID1Uxvl-46mcBEAym-VxnOe8Y4r&index=13

Question 3

SiF4 hydrolysis forms?

Answer 3

Question 4

HNO3 with Cu (dilute)

Answer 4

Question 5

Brown ring test reaction

Answer 5

Question 6

PbO2 with HNO3 forms

Answer 6

reaction doesnt occurs

Question 7

P-P bond or N-N bond which is stronger

Answer 7

P-P bond is stronger

Question 8

White phosphorous is soluble in what

Answer 8

insolublein water but soluble in carbon disulphide

Question 9

Red phosphorus structure

Answer 9

Question 10

How is red phosphorous formed

Answer 10

Red phosphorus is obtained by heating white phosphorus at 573K in an inert atmosphere for several days.

Question 11

How is black phosphorous formed

Answer 11

When red phosphorus is heated under high pressure, a series of phases of black phosphorus is formed.

Question 12

Structure type of black P

Answer 12

opaque monoclinic or rhombohedral crystals

Question 13

Which P is most thermodynamically stable

Answer 13

Black phosphorus is the most thermodynamically stable allotropic form of phosphorus.

Question 14

How to make P4O6 from P4

Answer 14

Question 15

P4 with HNO3 forms

Answer 15

Question 16

Phosphine prepared by Ca3P2

Answer 16

add acid or water to it

Question 17

P4 with NaOH

Answer 17

Question 18

PH3 with contact with oxidizing agents like HNO3 does____

Answer 18

explodes

Question 19

What happens in holme’s signals

Answer 19

The spontaneous combustion of phosphine is technically used in Holme’s
signals. Containers containing calcium carbide and calcium phosphide are pierced
and thrown in the sea when the gases evolved burn and serve as a signal. It is also
used in smoke screens.

Question 20

What is used in smoke screens

Answer 20

PH3

Question 21

How is trichloride formed with P4

Answer 21

Question 22

PCl5 color

Answer 22

yellowish white powder

Question 23

Which oxoacid of P is reducing and what makes it reducing

Answer 23

Hypophosphorous acid is a good reducing agent as it contains two PH bonds and acids which contain PH bonds have strong reducing properties

Question 24

P4O6 with H2O

Answer 24

Question 25

P4O10 with H2O

Answer 25

Question 26

Grp 16 Electron affinity

Answer 26

Question 27

Grp 16 melting point

Answer 27

Question 28

Why is there are a large difference between MP and BP of O and S

Answer 28

the large different between the melting and boiling point of O and S may be explained on the basis of their atomicity oxygen exists as diatomic molecule whereas sulphur exists as polyatomic molecule (S8)

Question 29

which grp 16 element is radioactive element

Answer 29

polonium(Po)

Question 30

Reducing character of hydrides of grp 16

Answer 30

increases down the group

Question 31

Which hydride doesn’t has reducing properties

Answer 31

H2O

Question 32

HNO3 with Cu (conc)

Answer 32

Question 33

HNO3(dil) with Zn

Answer 33

Question 34

HNO3(conc) with Zn

Answer 34

Question 35

PbO+HNO3

Answer 35

Question 36

White phosphorous is poisonous/nonpoisonous

Answer 36

poisonous

Question 37

White phosphorous structure

Question 38

White phosphorous glow. true/falsee

Answer 38

true

Question 39

white P is more reactive or red P

Answer 39

White P

Question 40

two types of black P

Answer 40

alpha and beta - black P

Question 41

how is alpha black P formed

Answer 41

α-Black Phosphorus is formed when red phosphorus is | heated in a sealed tube at 803K

Question 42

how is beta black P formed?!

Answer 42

β-Black phosphorus is prepared by heating white phosphorus at 473 K under high pressure

Question 43

PH3 smell and is it poisonous?

Answer 43

rotten fish smell and its highly poisonous

Question 44

how is pentachloride formed with P4

Answer 44

Question 45

whose bond dissocial enthalpy is more? O-O or S-S

Answer 45

S-S