Basic Radicals Grp1( Pb²+)

Question 1

Pb²++ HCl, colour

Answer 1

PbCl2 (white)

Question 2

Is PbCl2 soluble in hot water? If yes what does it form?

Answer 2

Yes, [PbCl4]²‐

Question 3

Is Pb²+ soluble in Ammonium hydroxide? Give reason

Answer 3

No, as ammonium hydroxide is a weak base

Question 4

Is Pb²+ soluble in Aqueous NaOH?If yes then write the series of reactions

Answer 4

Pb²+ + NaOH———–>Pb(OH)2
Pb(OH)2—–NaOH—–>[Pb(OH)4]²‐(colourless)

Question 5

What is the ppt and its color when [Pb(OH)4]²- is treated with H2O2 or H2S2O8?

Answer 5

PbO2(black)

Question 6

Does Pb²+ dissolve in hotwater?

Answer 6

Yes

Question 7

Pb²+ + CrO4²- , is the product soluble in dil HNO3 or aq NaOH

Answer 7

PbCrO4(yellow), yes

Question 8

PbCrO4+ dilHNO3, what is the solution color?

Answer 8

Pb(NO3)2 (colourless)+ Cr2O7²-

Question 9

PbCrO4 + NaOH

Answer 9

[Pb(OH)4]²- + CrO4²-

Question 10

Pb²+ + KI,color

Answer 10

PbI2( yellow ppt)

Question 11

PbI2+excess KI

Answer 11

[PbI4]²-

Question 12

Pb²+ + KCN ,colour

Answer 12

Pb(CN)2(white ppt)