Tests For SO3²-

Question 1

SO3²- +HCl

Answer 1

SO2 + Cl‐

Question 2

SO2+Cr2O7²-(orange) acidic medium,

Answer 2

Cr2(SO4)3 (green)+ SO4²- + H2O

Question 3

How do you distinguish between SO2 and CO2?

Answer 3

Cr2O7²- test, CO2 doesnot react

Question 4

SO2 + MnO4‐

Answer 4

Mn2+ + SO4²-

Question 5

SO2 + Ca(OH)2 ppt and colour and what happens when the product is further treated with SO2, is the series od reactions applicable with Ba(OH)2 also?

Answer 5

CaSO3(white), Ca(HSO3)2 forms, yes

Question 6

[Ag(SO3)]‐ + AgNO3, mention colour of ppt

Answer 6

Ag2SO3(white)

Question 7

Ag2SO3 + SO3²-

Answer 7

[AgSO3]-

Question 8

When SO3²- is treated with AgNO3 what forms first? Complex or ppt?

Answer 8

Complex forms first

Question 9

Is Ag2SO3 soluble in dil HNO3 and aqueous ammonia ?

Answer 9

Yes, its soluble in both

Question 10

What happens on boiling the solution of the complex salt [AgSO3]-

Answer 10

Metallic silver is precipitated

Question 11

SO3²- + Pb(NO3)2(colourless) or PbCH3COO-, give ppt colour also

Answer 11

PbSO3(white)

Question 12

Zn + SO3²- in acidic medium

Answer 12

Zn2+ + H2S + water

Question 13

How is H2S liberated in the previous reaction?

Answer 13

H2 liberated reduces SO3²- to H2S

Question 14

Zn + dil HNO3

Answer 14

N2O

Question 15

How is N2O liberated here

Answer 15

H2 liberated reduces NO3- to N2O