106to Q5. i also agree to rickde's ans..
but ans given x=4
Q1. Zero magnetic moment of K2NiF6 is due to
(a) Low spin Ni(IV) d6
(b) High spin Ni(IV) d6
(c) Low spin/ high spin not applicable (my option)
I feel that question is wrong
as given in JD LEE that the compound is intensely yellow or orange in colour
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17 Answers
29[Ni(H2O)6]2+ + NH3 → [Ni(H2O)5NH3]2+
[Ni(H2O)5NH3]2+ + NH3 →[Ni(H2O)4(NH3)2]2+ cis trans possible
[Ni(H2O)4(NH3)2]2+ + NH3 → [Ni(H2O)3(NH3)3]2+ fac-mer possible
[Ni(H2O)3(NH3)3]2+ + NH3 → [Ni(H2O)2(NH3)4]2+ cis trans possible
[Ni(H2O)2(NH3)4]2+ + NH3 → [Ni(H2O)(NH3)5]2+
[Ni(H2O)(NH3)5]2+ + NH3 → [Ni(NH3)6]2+
so total : 6 geometrical
Edited : wat abt the optical isomers?
106stepwise displacement means all types .i.e. 1 NH3, 2 NH3, 3 NH3 and so on naa? i just din get the meaning
29Told ya...in 4d ..there will be 6 geometrical isomers...2cis 2 trans..fac and mer...
1due to repulsion between hydrogen..one phenyl ring is perpendicular to other
1weak field ligand>>> 4 unpaired electrons>>> b) high spin ni(4)>>>> d6
1x=5
2Fe +3 → +2 +2 e
2S -2 → +6 -16 e
S -2 → +4 -6e
so total 20 e lost
106@rickde.. NO2 is obtained as a liquid? or gas ?
to 4. ans given: all
106Q2. In which of the following cell, the value of reaction quotient is less than 1?
(a) Zn|Zn^{+2}(0.1M)||Cu^{+2}(0.01M)|Cu
(b) Zn|Zn^{+2}(0.1M)||Hg_{2}Cl_{2},KCl(0.1M)|Hg
(c) Hg|Hg_{2}Cl_{2},KCl(0.1M)||PbC_{2}O_{4},CaC_{2}O_{4},CaCl_{2}(0.1M)|Pb
(d) both (B) and (C)
Q3.MULTI ANSWER
select correct statements
(a) Nitrogen sesquioxide exists in two different forms, which may be interconverted by irradiation of light
(b) NO2 is obtained as a brown liquid and on cooling becomes colourless solid due to dimerisation
(c) In P4O10 terminal P-O bond is much shorter than other P-O bonds
Q4. MULTI ANSWER
Identify incorrect statements
(a) Biphenyl is aromatic with both benzene ring in the same plane
(b) Ziegler-Natta Catalyst is homogenous
(c) Density of third row transition elements is lower than second row
(d) On stepwise ligand displacement of hexaaquanickel(II) ion with ammonia, all the possible geometrical isomers in this system is 8
Q5. INTEGER TYPE
The number of electrons lost when one mole of Fe2S3 is conveted to FeSO4 and SO2 is 4x. Find x
106but if its high spin, then how magnetic moment is zero???
but JD LEE says that compound is intensely coloured
corrected d8 to d6