Acidic radicals

Question 1

group 1

Answer 1

s2- , no2-, thio , s032-, co32-,

Question 2

colourless, suffocating odour, burning sulphur

Answer 2

sulphite, so32- , na2so3,
gas - so2

Question 3

brisk effervesence , evo of coloulesss odourless gas

Answer 3

carbonate ion ,
na2co3, gas - co2

Question 4

rotten egg

Answer 4

sulphide s2-,
h2s

Question 5

light brown gas

Answer 5

nitrite no2-
reaction
nano2 + h2so4
1 ) hno2
2) NO + hno3
3) no2 - brown

Question 6

lime water turns milky

Answer 6

c02 gas through lime water
- formation of cac03 from ( co2 + ca(oh)2)

Question 7

addition of excess co2 + lime water

Answer 7

milky turns colourless -
formation of cah(co3)2

Question 8

what other gas excep co2 turns lime water milky

Answer 8

So2 ( s032-)

Question 9

acid ( k2cr207 ) paper exposed to which gas turns green . Forms what ? conformation of what

Answer 9

k2cr207 + sulphuric aicd + so2 =
k2s04 + { cr2(so4)3}
bracket is green in colour

Question 10

ferric sulphate ( fe2so4)3 which colour turns what compound and waht colour on reaction with so2

Answer 10

forms -
{ Feso4 } ferrous sulphate
GREEN COLOUR

Question 11

what gas on reaction with lead acetate paper turns black. What compounds is formed , what conformation .

Answer 11

the gas is H2s ( rotten egg smell)
black product formed is {Pbs}
conformation of S2-ion .

Question 12

gas No2- releases is X
X+ 02 = brown coloured gas formation Y
X + dil FeSo4 = brown coloured salt Z
This is which famours experiment
oxdation states of elements in it

Answer 12

X - NO
Y - NO2
Z =
Feso4.7water + NO =
[Fe(h20)5 NO] .So4
this is brown ring complex. unstable
fe plus 1
no plus 1
so4 2-

Question 12

vinegar smell vapours ?
reaction of that compound with neutral X gives which coulour Y

Answer 12

acetate ion test
acetic acid vaouprs
blood red colouration
- [CH3COO)3Fe]

Question 12

s2- conformation ( prusside test )

Answer 12

s2- + ]Fe(CN)5NO]2- { colourless}
gives
[ Fe( CN)5NOS]-4
THIS IS VIOLET / PURPLE

Question 13

s2- cadmium conformation

Answer 13

S2- + cd = CdS
YELLOW IN COLOUR

Question 13

group 2 radicals are what

Answer 13

Hello late nhi
halgens except f-
oxalate
nitrate

Question 14

iodide + nitrite + dil sulphuric acid = decomposes to give what , colour?

Answer 14

HNO2+ HI = I2 + 2NO
{ this I2 is iodine - violet colour vapours }

Question 15

pungent gas which fumes in air . Addition of X gives what colour gas

Answer 15

after addition of conc h2s04 it gives HCL
add pinch of Mno2 - X
gives Mncl2 + Cl2 gas ( pale green colour )

Question 16

bromide ion test what do you add , pinch , what colour you get

Answer 16

reddish brown fumes , again Mno2

Question 17

iodide ion test , which colour

Answer 17

violet pungent fumes , intensitfy on MN02 addintion .
they comdense as black spots on cooler areas of test tube.

Question 18

light brown fumes of NO2 intensify on adding which metal .
gives which ion test.

Answer 18

Cu metal
forms Cu(No3)2 + no2
This is

Question 19

gas which burns with bluw flame at mouth of tube . its salt decomposes to give z number of gases

Answer 19

Oxalate
h2c2o4 = co + co2 + water

Question 20

when nacl is tested with conc h2so4 some acid is produced. that acid with X gives dense white fumes exmplain
this gas acid also gives curdy white ppt with silver nitrate sollution . This ppt is completely soluble in X .

Answer 20

Hcl is gas acid.
+ Nh4oh gives ammonium chloride white fuems . X - is nh4oh
HCL + agno3 = Agcl ppt
Agcl+ NH4OH = Ag(NH3)2Cl
this complex is copmpletely soluble in x

Question 21

When conc is reacted with X in 2:1 ratio , it forms a chromium compound C. This compound when reacted with Hcl forms Y.
in presence of X gives which colour vapours of Y . What is the test
ii)
when vapours of Y is passed through z ( alkaline) solution becomes which colour due to formation of {E}
iii) E on reaction with ch3cooh , and lead acetate gives —– colour same colour ppt of {G}

Answer 21

C - Cro3
X - K2cr207
this gives deep red vapours of
Y - chromyl chloride ( Cr02Cl2)
z - NaOH
it becomes yellow colour
E - Na2Cro4
this on reaction with lead acetate gives again yellow ppt of G
G - PbCro4

Question 22

Chromyl chloride test is not given by ? and why should it be dry

Answer 22

because cromyl cl vapours will hydrolyse ,
this is not shown by Hgcl2, sncl2 agcl , sbcl3

Question 23

which ion gives pale yellow ppt of X on reaction with Agno3
i) X is partially soluble in Y
ii) if Y is excess then Z is formed
iii) if this ion is treated with cl water gas E is liberated
iv) this gas E dissolves in which gas or Ccl4 forming which coloured layer

Answer 23

Br- ion
X - Agbr
Y - NH4Oh
Z - [Ag(Nh3)2]Br
E - Br2

brown coloured layer is formed in reaction with CHCL3 , or chlorform

Question 24

which ion which gives blue colour with starch
i) this ion gives which colour ppt with Agno3
ii) this ppt is insoluble in X
iii) this ion when treated with cl water which gas is liberated
iv) this liberated gas reacts with gases Z and Y giving violet colour
v ) this ion reacts which calomel to give which coloured ppt {G}

Answer 24

Iodide ion
yellow ppt of AgI
X - NH4OH
Iodine gas is liberated
Y , Z = chcl3 and CCL4
I2 + chcl3 is called layer test forms violet layer .
I- reacts with Hg2cl2 to give
SCARLET RED PPT
HgI2

Question 25

when aq soln of ion X reacts with frehly prepared soln of Y and conc , which coloured ring complex is formed .
give formula

Answer 25

(No3)- = X
Y = Feso4
Brown ring complex
6 Feso4 + 2 HNO3 + conc=
Fe2(so4)3 + NO
ii)
This is NO
will give brown ring which is
[ Fe(Ho2)5NO].S04 .

Question 26

salt of No3- ion when reacted with metals
X and Y in presenc of conc NaOH evolves gas {D} which has characteristic odour

Answer 26

X , Y - Zn and Al
D - NH3

Question 27

What are gp 3 radicals

Answer 27

Beta sulpho
Borate ( bo32-)
sulph - is so42-
Pho ( po4)3-
and F-

Question 27

ring test is not realiable in presence of what why .

Answer 27

Br-, I- .
Becasue of liberated halogens
they can be removed be adding excess of nitrate free Ag2so4

Question 28

Gp 3 reagents
i) X for so42-
ii) Y for borate
iii) Z for phosphate
iv ) D for F-

Answer 28

X = Bacl2
Y= C2H5OH ethly alcohol + conc h2s04

Z= conc Hn03 and ammonium molybdate
D = sand and conc h2so4

Question 29

Take salt add Bacl2
which conformation is this
i) which pppt is obtained which in insoluble in D. what is the colour of this ppt

Answer 29

Conformation test for (So4)2-
ppt is BaS04 . white ppt

D = conc HNO3

Question 30

if the sulphate salt is of Silver or lead , then on reaction with Bacl2 will give X or Y
so to avoid this D can be used instead of Bacl2 to anlyse So42-

Answer 30

X - Agcl
Y- Pbcl2
D - BaNo3