Hg2²+

Question 1

Hg2²+ + Cl-, ppt color, is the ppt soluble in dil acids? What is it soluble in?

Answer 1

Hg2Cl2(white), no, it is soluble in aqua regia

Question 2

Hg2Cl2 + aqua regia(HNO3 + HCl), is the product soluble, does it dissociate?

Answer 2

HgCl2 + NO + water, here HgCl2 is soluble but doesnot dissociate

Question 3

Hg2²+ + NaOH, ppt color

Answer 3

Hg2O(black)

Question 4

Is Hg2O soluble in excess base? , does it dissolve in dil HNO3

Answer 4

No, yes

Question 5

Hg2O heating

Answer 5

HgO(black) + Hg(ppt)

Question 6

Hg2²+ + CrO4²- , ppt color

Answer 6

Hg2CrO4(red)

Question 7

Hg2CrO4 + aq NaOH

Answer 7

Hg2O + CrO4²- + water

Question 8

Hg2²+ + KI , ppt color

Answer 8

Hg2I2 ( green ppt)

Question 9

Hg2I2 + excess I-

Answer 9

[HgI4]²- + Hg(ppt)

Question 10

Hg2²+ + CO3²- , ppt colour

Answer 10

Hg2CO3(yellow)

Question 11

Hg2²+ CN- , ppt colour

Answer 11

Hg2(CN)2(white)

Question 12

What does Hg2(CN)2 disproportionate to give? Give colour of product

Answer 12

Hg(ppt) + Hg(CN)2(black)

Question 13

Is Hg(CN)2 soluble in H2O, does it dissociate to form ions?

Answer 13

Soluble but doesnot dissociate

Question 14

Can Hg2²+, Hg²+, Pb²+ form complex with excess KCN?

Answer 14

No they cannot

Question 15

Hg2Cl2 + SnCl2 , ppt color

Answer 15

Hg(black) + SnCl4

Question 16

Hg2²+ NH3 + NO3- , mention colour of products, what can this reaction be used for?

Answer 16

HgO.[Hg(NH3)(NO3)] (white ppt)+ Hg(black ppt)+ NH4+. It can be used to distinguish between Hg+ and Hg²+