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Inorganic Chemistry

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17 Nov 2008 14:48:19 IST

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889

explain clearly

None

which of the following has lowest lattice energy

a)LiF

b)NaCl

c)KBr

d)CsI

q)the stability of chloride of alkali metal

KCl>cscl>nacl>licl how ?///////////explain

which of the following has higest melting point

a)Nacl

b)Licl

c)Kcl

d)Rbcl

need explanation

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Comments (9)

varsha valli g.

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17 Nov 2008 19:22:30 IST

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1)CsI-bcoz both of the atoms r large in size and weak forces bind them.so their lattice E is less.Li and F are very small so the forces of attraction are strong and so lattice E is high.

!!!!!!!!!!!!!!!!!!!!!!!!

akki ~~ unlucky forever ~~

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17 Nov 2008 19:23:59 IST

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r₊=radius of cation

r_-=radius of anion

from option (d) CsI will have lowest lattice energy............

* * * * *

Bhaskaryya Baruah

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17 Nov 2008 22:51:12 IST

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answer of d last question is (b) LiCl..... not sure... but LiCl has highest lattice energy.

debmalya choudhuri

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17 Nov 2008 23:07:23 IST

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it is obvious from the relation of lattce enrgy taht lattice enrgy is directly proprotinal to charge and inversely proportional to radii of atoms here charge is same so leser the radii more the lattice enrgy so the answer follows taht csi has lowest lattice enrgy and lif the highest

MAYUR GOENKA

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17 Nov 2008 23:13:18 IST

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LiCl generates covalent character!!!.
thus it is hard to break such kind of a bond.
therefore, it has max b.p.!!!

rate if it helps!!!!!!!!!!

ishi obroi

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21 Nov 2008 03:31:04 IST

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but ans of last is Nacl

svj 29

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23 Nov 2008 16:09:02 IST

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Ya the answer of the last question is NaCl...

take this as an exception... that would be better... coz the explanation isn't valid for all questions.

Saurabh Jha

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23 Nov 2008 18:53:59 IST

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NaCl ha sth ehighest m.p bcoz LiCl being covalent has lower m.p than Nacl which is ionic in nature( + and - ions attract each other strongly) and as we move down in group m.p. decreases as lattice enthapies decreases as size of alkali metal atom increases.

Saurabh Jha

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23 Nov 2008 18:54:43 IST

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do rate if useful.

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