P block 7

Question 1

H4B2O6 + H2O

Answer 1

B is in +4 state! when it is in more than the needed OS, there is a peroxide linkage! and when there is a peroxide linkage, H2O2 is formedthereforeH3BO3 + H2O2

Question 2

the only boron halidw which doesnt forms HX on hydrolysis

Answer 2

BF3 doesnt foroms HF ! instead it forms HBF4 + H3BO3

Question 3

CO2 in water forms

Answer 3

H2CO3

Question 4

SiO2 (amorphous) in water

Answer 4

Si(OH)4 ——-> H2SiO3

Question 5

NF3 with water gets no reaction! why?

Answer 5

cuz no empty orbitals for H2O

Question 6

N2O4 in water

Answer 6

disproportionate reaction

HNO2 + HNO3

Question 7

PCl3 in water

Answer 7

H3PO3

Question 8

HOCl with Water

Answer 8

OCl^-1

Question 9

PCl5 with water

Answer 9

H3PO4

Question 10

P4O7 with Water

Answer 10

H3PO4 + H3PO4

Question 11

P4O8 with water

Answer 11

H3PO4 + H3PO4

Question 12

P4O9 with Water

Answer 12

H3PO3 + H3PO4

Question 13

SO2 + H2O

Answer 13

H2SO3

Question 14

SO3 + H2O

Answer 14

H2SO4

Question 15

SOCl2 + H2O

Answer 15

H2SO4 + HCl

Question 16

SF6 doesnt reacts with water! why?

Answer 16

no space for water to enter! too much steric hinderence! there fore hydrolysis of high Atm number elements hydrides is simpler

Question 17

H2S2O5 + H2O

Answer 17

H2S2O3

Question 18

H2S2O6 + H2O

Answer 18

H2SO4

Question 19

H2S2O7 + H2O

Answer 19

H2SO4

Question 20

H2SO4 + H2O2

Answer 20

H2S2O8

Question 21

SiF4 + H2O

Answer 21

HSiF4

Question 22

SbCl3 + H2O

Answer 22

SbOCl

Question 23

BiCl3 + H2O

Answer 23

BiOCl

Question 24

treated with CO2 forms

Answer 24

Question 25

CaF2 with SiO2+H2SO4 forms?

Answer 25

Question 26

SiF4 hydrolysis forms?

Question 27

sulfides soluble in nitric acid and sulfides which are not are?

Answer 27

Question 28

sulfides soluble in nitric acid and sulfides which are not are?

Answer 28

Question 29

PCl5 with water and excess of water forms?

Answer 29

Question 30

what is more reactive? F2 or ClF

Answer 30

F2

Question 31

what does ClF on hydrolysis forms?

Answer 31

on hydrolysis ClF Forms HOCl And HF

Question 32

electrolysis of concentrated solution of acidified sulphate solution yields?

Answer 32

H2S2O8

Question 33

which grp 15 hydride is the strongest reducing agent?

Answer 33

BiH3

Question 34

HNO3 with P4O10 forms?

Answer 34

Question 35

H2PO2^-1 with Ag+ forms

Answer 35

Question 36

what to keep in mind if we are asked number of lone pairs on a compound

Answer 36

keep in mind the lp of the constituents too like XeF6 has 19 lp

Question 37

PCL3 with H3PO3 forms?

Answer 37

H4P2O5

Question 38

P4 with H2O in basic medium forms?

Answer 38

Question 39

SO2 with dil H2SO4 forms

Answer 39

SO3

Question 40

SO3 with K2Cr2O7 forms

Answer 40

Question 41

which sulphur is diamagnetic? and which is paramagnetic?

Answer 41

alpha,beta sulfurs are diamagnetic and S2 sulphur are paramagnetic

Question 42

NO with N2O4 forms

Answer 42

Question 43

what is used in cryosurgery?

Answer 43

N2

Question 44

what can be used as an inert diluent for reactive chemicals?

Answer 44

N2

Question 45

NH3 with Cl2(excess) forms

Answer 45