1for Q4
Hg + I2 + heat → HgI2 this is scarlet red in colour
on furthur heating above 400K we get yellow HgI2 its allotrope
(beta form as far as i remember)
Q1 Boiling CuCl2 with excess copper turnings and conc HCl gives ??
Q2 Cu2+ is more stable than Cu+ due to ??
Q3 CuSO4 + lime = ??
Q4 Yellow mercuric oxide is obtained by?
Q5 The iron salt used in blue prints is ??
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24 Answers
13@eure... Matlab it needs to be mentioned in the Qn (Q2) that the ion stabilty is being asked fr the medium being Water.... matlab hydrate toh tab hoga naa agar paani ho aas-paas....!!!
@ rick.... Taking out an electron wud be difficult agreed, but then taking "in" wud be easy relatively,,,how does it account fr gr8ter stability ?
11the ans will be both
as cu2+ is smaller in size, it will be more hydrated so will be more stable
aslo increase in effective nuclear charge means the rest of the electrons are bound more tightly and so no more electron can be taken out
13lol......
Now i wud say just this-
Firstly, They haven't stated out the full proper Question, if they r expecting the answers to be as they have given..
& Secondly, Does higher charge density imply greater stability ? How?
24no avik u r not asleep......I am fully asleep..gave wrong options...
here ae rite options
Q2 options are
a)extensive hydration of Cu2+ ion
b)higher charge and smaller size of Cu2+ as compared to Cu+ ion
c)both
132) Yup..... it'll be "none of these" 'coz they haven't mention a medium or nything as Aqueous etc......
Hence, it is just being asked in general terms ....
n Because it will be a false Statement (Cu+ is the stabler one)....ans 'll be "c" only....
Am really wondering whether i was half asleep the last time i was posting [3]
135) I know Blueprint ppr is also known as ferroprussiate ppr..... Is ferro prussiate a salt ? :P
132) Actually, Cu+ is stabler as compared to Cu2+, (Pseudo noble gas configuration)
.....But.....
When in water ,Cu2+ ion is stabler due to Higher Hydration Enthalpy.....
24Q2 options are
a)extensive hydration of Cu2+ ion
b)higher charge and smaller size of Cu2+ as compared to Cu+ ion
c)none
19electronic configurations of Cu+1 and Cu+2 are 3d10 and 3d9 respectively. Cu+1 has a core of 18 electrons and the nuclear charge in Cu+1 is not sufficient to hold a core of 18 electrons . thus Cu+1 undergoes disproportionation as 2Cu+1------>Cu+2 +Cu
24asish,saheli u r wrong...
rahul u r partially correct..
and in 3 i need name of mixture..its not reaction
19had i got this as a matrix match question in IITJEE i would have said to myself "leave this " !
.....thats all .....;)
1ans 3) cuso4 +lime(cao)= caso4 +cuo
(displacement reaction)(i may b wrong)
1Q2) Cu2+ is stabilised by higher solvation and lattice energy.............