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Q. Explain about Hydrogen Sulphide?
Hydrogen sulphide is the only thermodynamically stable sulphane. It is a foul smelling and poisonous gas.
H2S is prepared in the laboratory by treating FeS with dilute HCI in Kipp's apparatus. In aqueous solution H, S is a weak acid. At 293 K, it dissociates as shown below:
You must have used H2S in qualitative identification and separation of cations. This separation is based on selective precipitation of the sulphides in acidic and alkaline medium: In the acidic medium, the ionisation of H2S which is a weak acid, is further suppressed and the solubility product of sulphides of relatively less soluble cations of Group 11, namely. Pb2+, Hg2+, Bi3+, Cu2+ , Cd2+ . As3+, Sb3+, Sn+2 is exceeded:
In Group IV, in the presence of ammonia, a higher concentration of S2- ions is obtained leading to the precipitation of the more soluble sulphides of Zn, Mn, Ni and Co.
Which one is the electronic configuration of Fe +2 : (1) 1s 2, 2s 2 , 2p 6 , 3s 2 , 3p 6 , 3d 6 (2) 1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 4 , 4s 2 (3) 1s 2 , 2s 2 ,
Q. Explain Distillation in purification of metals? Metals with low boiling points, such as cadmium, zinc and mercury will be purified by distillation. The distillation is gener
concentration on acetic acid
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Show by means of equations and reagents, how the following conversion would be achieved? Propyne to butanoic acid
The electronic configuration of chromium is: (1) [Ne]3s 2 , 3p 6 , 3d 4 , 4s 2 , (2) [Ne]3s 2 , 3p 5 , 3d 4 , 4s 1 , (3) [Ne]3s 2 , 3p 6 , 4s 2 ,
Write the similarities of lithium with other alkali metals
?H value obtained for the reaction NH3 + HCl –› NH4Cl using the thermodynamic data in your lab procedure?
1.using diagram,explain how fluorescence optical bench works 2.Explain the applications of mass spectrometric detector (LC/MS)in HPLC 3.Discuss the current development in the field
what is crystallisation
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