When H2S Is Passed Through A Cuperic Salt Added To Excess Of KCN, No Black Precipitate Of CuS Is Obtained. This Is Due To The Presence Of Copper Largely As:

Why Kaysons ?

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Question

When H2S is passed through a cuperic salt added to excess of KCN, no black precipitate of CuS is obtained. This is due to the presence of copper largely as:

Solution

Correct option is

[Cu(CN)3]2–

 

;   

        

Hence, [Cu2+] is too small to give CuS(s) with H2S.

Testing

SIMILAR QUESTIONS

Q1

How many moles of AgCl would be obtained, when 100 ml of 0.1 MCo(NH3)5Cl3 is treated with excess of AgNO3?

Q2

0.001 mol of Co(NH3)5(NO3)(SO4) was passed through a cation exchanger and the acid coming out of it required 20 ml of 0.1 M NaOH for neutralization. Hence, the complex is

Q3

Which of the following is not chelating agent?

Q4

A compound contains 1.08 mol of Na, 0.539 mol of Cu and 2.16 mol of F. Its aqueous solution shows osmotic pressure which is three times that of urea having same molar concentration. The formula of the compound is :

Q5

When HgI2 is added to excess of aqueous KI, mercury largely exists as

Q6

The solution of AgBr in presence of large excess of NH3 contains mainly the cation

Q7

 

The molar ionic conductances of the octahedral complexes :

(i) PtCl4.5NH3                       (ii) PtCl4.4NH3

(iii) PtCl4.3NH3                     (iv) PtCl4.2NH3

Follow the order

Q8

On treatment of 100 ml of 0.1 M solution of the complex CrCl3.6H2O with excess of AgNO3.4.305g of AgCl was obtained. The complex is

Q9

Which of the following species is not expected to be a ligand

Q10

 

EAN of the central metal in the complexes :

      K2[Ni(CN4].[Cu(NH34]SO4 and K2[PtCl6]

are respectively