Tests For NO3‐

Question 1

NaNO3+ H2SO4

Answer 1

HNO3

Question 2

What does HNO3 give on heating? What is the indication

Answer 2

NO2+ O2 + H2O, brown fumes of NO2 in the bottom of the test tube

Question 3

What happens to HNO3 on exposure to light at 25 degree C

Answer 3

This time yellow NO2 is formed along with O2 and water

Question 4

What nitrates donot give brown ring test directly? And how can they be made to give the test?

Answer 4

Pb(NO3)2, Sr(NO3)2, Ba(NO3)2, Ca(NO3)2, Na2CO3 extract has to be prepared

Question 5

HNO3 + FeSO4

Answer 5

Fe2(SO4)3 + NO gas

Question 6

NO + FeSO4(aq)

Answer 6

[Fe(H2O)5NO]SO4

Question 7

NO3- + Zn + NaOH

Answer 7

[Zn(OH)4]²‐ + NH3 gas

Question 8

NO2‐ + Zn + NaOH

Answer 8

[Zn(OH)4]²‐ + NH3 gas