1@ashish.....actually the answer is false!!!
the reason being..that this leads to calculation of absolute G,H an most importantly..absolute S............the question may seem lame but due to it i lost 3 mark at a test!!!!!
state true false:
1)H=G+TS {where symbol have their usual meanings}
2)CuCl2 reacts with H2S to form a mettalic sulphide!!!
3)pka+ pkb=pkw at all temperatures
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11 Answers
1
106I know that exact values of G,H,S cant be defined
but G is defined as H-TS
look at wiki here
http://en.wikipedia.org/wiki/Gibbs_free_energy
look under the heading definitions
1i know in wiki...its given...but think about the point......also tell me what will u do if such questions come in JEE
1that should have been the case...but in a test in brilliant its given as false!!!!!thats why luking for alogic!!!!
1CuS , cupric sulphide also known as covellite (darker indigo-blue in colour - or rather black) is formed.
CuCl2 + H2S → CuS + 2HCl
so ...i guess.....(2) is TRUE
12> False
The formula might seem to suggest the description Cu2+, S2−. In fact the atomic structure shows that copper and sulfur each adopt two different geometries. Thus, the mineral is probably best described as consisting of both Cu2+, S2− and 2Cu+, S22−.
EN difference suggests that it might be COVALENT.
3> False
1HEY ALL.......THE EQUATION IS ACTUALLY
H=G + TS
dH = dG + TdS + SdT
Now for a given reaction when temperature doesn't change :
dT = 0
so ΔG = ΔH - TΔS
Now are you convinced that 1 is true ????