Qualitative Analysis

Question 1

Brisk effervescence and turns lime water milky

Answer 1

Carbonate ion

Question 2

Chromium Chloride Test is not given by

Answer 2

1. Chlorides of Hg, Sn, Ag, Pb and Sb;
2. Bromides
3. Iodides

Question 3

Brown Ring Test

Answer 3

Nitrate Ion

Question 4

Barium Chloride Test

Answer 4

Sulphate Ion

Question 5

Ammonium Molybdate test

Answer 5

Phosphate Ion

Question 6

Mixture + conc. HNO3 + ammonium Molybdate

Answer 6

Canary yellow precipitate

Phosphate ion confirmed

Question 7

Mixture + BaCl2 soln. + conc. HCl

Answer 7

BARIUM CHLORIDE TEST
White ppt. Insoluble in mineral acids

Sulphate ion confirmed

Question 8

Mixture + K2Cr2O7 + conc. H2SO4

Pass over NaOH

Treat with lead acetate

Answer 8

CHROMYL CHLORIDE TEST
Orange-yellow vapours of chromyl chloride (CrO2Cl2)

Forms yellow ppt of lead chromate

Chloride ion confirmed

Question 9

Interfering Acid Radicals

Answer 9

1. Borate
2. Oxalate
3. Fluoride
4. Phosphate

they interfere in usual test of basic radicals

Question 10

Group 1 Reagent

Answer 10

Dil. HCl

Question 11

Group 2 Reagent

Answer 11

Dil. H2SO4 and pass H2S

Question 12

Group 3 Reagent

Answer 12

NH4OH in presence of NH4Cl and add dil. HNO3

Question 13

Group 4 reagent

Answer 13

NH4OH with NH4Cl and pass through H2S

Question 14

Group 5 reagent

Answer 14

NH4OH with NH4Cl and (NH4)2CO3

Question 15

Group 6 reagent

Answer 15

Sodium Hydrogen Phosphate

Na2HPO4

Question 16

Nessler’s Reagent Test

Answer 16

Ammonium Ion

Brown ppt

Question 17

Borax Bead Test

Answer 17

Platinum wire heated + dipped in borax powder + heat

Question 18

Formula of borax bead

Answer 18

Sodium metaborate

NaBO2

Transparent glassy bead

Question 19

Borax Bead Test—blue

Answer 19

Cobalt

Question 20

Borax Bead test—light blue/green and colourless/red

Answer 20

Copper

Question 21

Borax Bead Test—-yellow brown/bottle green

Answer 21

Iron (Fe+3)

Question 22

Borax Bead Test—green and green

Answer 22

Chromium

Question 23

White ppt. + dil. HCl

+ H2O + KI

Observation?

Answer 23

Red ppt.

Lead

Question 24

Brown ppt in Nessler’s Reagent Test is due to formation of?

Answer 24

Iodide of Millon’s Base

Question 25

Sodium Carbonate Extract + Sodium Nitopruside

Observation?

Answer 25

Purple colour of
Na4[Fe(CN)5NOS]

Due to presence of Sulphide Ion(S-2)

Question 26

Mercurous Chloride (HgCl) + NH4OH

Observation?

Answer 26

Black ppt of Hg

Question 27

Insoluble in Dil. HNO3

Answer 27

HgS

Question 28

Cr(OH)3 + NaOH + Na2O2

Observation?

Answer 28

Yellow colour of Na2CrO4

Question 29

Metal Ion soln. + Cobalt(ll)thiocyanate

Deep blue soln.

Answer 29

Hg+2

Question 30

Mercurous salt + Cobalt(ll)thiocyanate

Answer 30

Deep blue solution

Question 31

A compound that does not impart colour to the flame

Answer 31

KI

Question 32

Reaction of bismuth and antimony chlorides with water?

Answer 32

White ppt. Of oxychloride formed

BiOCl for bismuth

Question 33

Type of compound that gives blood red colour with FeCl3

Answer 33

a compound containing N and S

This forms NaSCN

Which on reaction with FeCl3 gives FeSCN(blood red)

Question 34

An ion that cannot be precipitated by both HCl and H2S

Answer 34

Sn+2

Question 35

Fe+3 soln. + PO4 -3 soln.

Answer 35

Ppt of FePO4 formed

Question 36

Silver salt insoluble in water

Answer 36

Ag2SO4

Question 37

Active species in Nessler’s Reagent for Detecting NH4+ ion?

Answer 37

[HgI4]-2