Qualitative analysis 3

Question 1

Biuret test reagent

Answer 1

Alkaline CuSO4

We get violet color

Question 2

Ninhydrin test reagent

Answer 2

search for ninhydrin structure

we get purple color)(Rhumann’s purple

Question 3

Xanthoproteic test reagent

Answer 3

conc. HNO3

we get yellow color

Question 4

CrO42- + H2O2 + H+ —->

Answer 4

CrO5(blue)

Question 5

1 naphthyl amine

Answer 5

two benzene rings, one of them has NH2 grp at ortho position of attachment

Question 6

where does diazotization of 1 naphthyl amine happen

Answer 6

At para position of of NH2 of the napthyl amine

Question 7

Turning potassium dichromate paper green

Answer 7

K2Cr2O7 + H2SO4 + SO2 ——> Cr2(SO4)3 + H2O + K2SO4

Question 8

HNO2 ——>

Answer 8

HNO3 + NO + H2O

Question 9

Cl- + MnO2 + H2SO4

Answer 9

Cl2 + MnSO4+ Na2SO4 + H2O