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Inorganic Chemistry > P Block 4 > Flashcards

P Block 4 Flashcards

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1
Q

trick for sulphur oxacids names

A
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2
Q

trick for sulphur oxacids structures

A

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

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3
Q

SiF4 hydrolysis forms?

A
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4
Q

HNO3 with Cu (dilute)

A
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5
Q

Brown ring test reaction

A
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6
Q

PbO2 with HNO3 forms

A

reaction doesnt occurs

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7
Q

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

A

P-P bond is stronger

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8
Q

White phosphorous is soluble in what

A

insolublein water but soluble in carbon disulphide

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9
Q

Red phosphorus structure

A
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10
Q

How is red phosphorous formed

A

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

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11
Q

How is black phosphorous formed

A

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

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12
Q

Structure type of black P

A

opaque monoclinic or rhombohedral crystals

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13
Q

Which P is most thermodynamically stable

A

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

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14
Q

How to make P4O6 from P4

A
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15
Q

P4 with HNO3 forms

A
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16
Q

Phosphine prepared by Ca3P2

A

add acid or water to it

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17
Q

P4 with NaOH

A
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18
Q

PH3 with contact with oxidizing agents like HNO3 does____

A

explodes

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19
Q

What happens in holme’s signals

A

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.

20
Q

What is used in smoke screens

A

PH3

21
Q

How is trichloride formed with P4

A
22
Q

PCl5 color

A

yellowish white powder

23
Q

Which oxoacid of P is reducing and what makes it reducing

A

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

24
Q

P4O6 with H2O

A
25
Q

P4O10 with H2O

A
26
Q

Grp 16 Electron affinity

A
27
Q

Grp 16 melting point

A
28
Q

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

A

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)

29
Q

which grp 16 element is radioactive element

A

polonium(Po)

30
Q

Reducing character of hydrides of grp 16

A

increases down the group

31
Q

Which hydride doesn’t has reducing properties

A

H2O

32
Q

HNO3 with Cu (conc)

A
33
Q

HNO3(dil) with Zn

A
34
Q

HNO3(conc) with Zn

A
35
Q

PbO+HNO3

A
36
Q

White phosphorous is poisonous/nonpoisonous

A

poisonous

37
Q

White phosphorous structure

A
38
Q

White phosphorous glow. true/falsee

A

true

39
Q

white P is more reactive or red P

A

White P

40
Q

two types of black P

A

alpha and beta - black P

41
Q

how is alpha black P formed

A

α-Black Phosphorus is formed when red phosphorus is

heated in a sealed tube at 803K

42
Q

how is beta black P formed?!

A

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

43
Q

PH3 smell and is it poisonous?

A

rotten fish smell and its highly poisonous

44
Q

how is pentachloride formed with P4

A
45
Q

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

A

S-S

Inorganic Chemistry (19 decks)

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