group 15

Question 1

most reactive allotrope of phosphorus and its solubility

Answer 1

white phosphorus ,insoluble in h2o but soluble in cs2 ccl4

Question 2

white and red phosphorus structures odour

Answer 2

..,garlic ,odourless

Question 3

melting and boiling point 15th increasing

Answer 3

n<p<as>sb>bi;
n<p<as<sb>bi</sb></as>

Question 4

most stable nitrogen trihalide,only ionic trihalide

Answer 4

NF3,BiF3

Question 5

higher oxides of halogens tend to be more stable than lower

Answer 5

true

Question 6

hydrolysis of pcl3,ncl3,sbcl3’bicl3

Answer 6

h3po3+hcl,hocl+nh3,biOCl+hcl,same as bi

Question 7

high purity of nitrogen can be obtained by

Answer 7

barium azide Ba(N3)2

Question 8

FROM NH3 HOW TO GET N2

Answer 8

combustion,heating with CuO

Question 9

which all decomposition gives N2

Answer 9

NH4NO2,BaN3)2,NH4)2Cr2O7,NH4ClO4

Question 10

Habers process condition for nh3 prep

Answer 10

catalyst: iron promoters:molybednum,al2o3,k2o
temperature:700k
pressure:200atm

Question 11

bond angle of nh3,h2o

Answer 11

107,104.5

Question 12

solubility of n2 nh3 ph3 odour toxicity

Answer 12

n2:low,odourless,non toxic
nh3:high,pungent odour
ph3:slightly,rotten fish,poisonous

Question 13

cynamide process

Answer 13

cac2+n2=cacn2+h2o=caco3+nh3

Question 14

urea to n2,nh3
urea hydrolysis

Answer 14

n2:urea+hno2 oxidation=n2
nh3:urea +naoh=nh3+naco3
urea+h2o=nh4)2vo3=nh3+h2o+co2

Question 15

suitable dehydrating agents of nh3

Answer 15

suitable:cao,cah2
not:cacl2,h2so4 as they react

Question 16

nh3 with cl2
nh3 with caocl2

Answer 16

Cl2
cl2 excess:ncl3+hcl
nh3 excess:nh4cl+n2
CaOCl2
CaOcl2 excess: cacl2+n2+h2o
n2 excess:nh2=nh2+cacl2+h2o

Question 16

nh3 to no,n2

Answer 16

no:catalytic oxidation in pt wire gives no
n2 :combustion

Question 17

excess nh3 soluble

Answer 17

Zn(oh)2=Zn(NH3)4]+2 colourless
cu(oh)2 pale blue ppt,Cu(NH3)4]+2 DEEP BLUE
AgCl/AgOH=Ag(nh3)2]+2 colourless
ni(oh2)green ppt=Ni(nh3)6]+2

Question 18

test for NH4+

Answer 18

nesselers reagent:k2(hgI4)
NH4+K2[HgI4]=NH2HgOHgI +KI+H2O
REDDISH BROWN PPT
MILLANS BASE

Question 19

Hydrazoic acid nan3 formation

Answer 19

NaNH2+N2O=NAN3+hcl=N3H
hydrazoic acid

Question 20

prep of no,n2o,n2o3,n2o5

Answer 20

no:nh3+pt wire oxidATION
nh4no2+feso4+h2so4
n2 +h2 high arc energy
n20:heating of nh4no3
anhydrous of H2N2O2
n2o3:anhydrous of hno2
no+no2
no2:decomp of pb(no3)2
N2O5=ANHYDROUS OF HNO3

Question 21

coloured oxides and paramagnetic,acidic

Answer 21

blue:n2o3;red brown:no2
para:no,no2
acidic:n2o3,n2o5,no2
neutral;no,n2o

Question 22

OSTWALDS PROCESS

Answer 22

NH4+02[Pt wire]=no

Question 23

HNO2+Cl2+h2o

Answer 23

HNO3+HCL

Question 24

HNO3 GIVES H2 DILUTE

Answer 24

MG,MN

Question 25

Au,Pt with aqua regia

Answer 25

aucl4- +NO
PtCl6)-2 +no

Question 26

HNO3 WITH Zn,Fe,Sn dil
hno3 with zn cu fe sn pb conc
hno3 with cu ag hg pb dil
passive

Answer 26

zn(no3)2+n20
cu(no3)2=no2
no
Sn Al Au, Pt,Cr

Question 27

brown ring test

Answer 27

for presence of no3- no2-
Fe+2 with no3-/…=fe+3 NO
fe+2 +no=[ Fe(H2O)5(NO)]+2
ON OF FE IS +1

Question 28

phosphine prep

Answer 28

P4+naoh+h2o=ph3+NaH2PO2