(1): But Fluorine is soluble in water due to its high oxidizing nature, decomposition even water and form ozonides oxygen.
(2): To increase the solubility of Iodine in water, potassium iodide (KI) is added
Showing posts with label 17th Group HALOGENS FAMILY. Show all posts
Showing posts with label 17th Group HALOGENS FAMILY. Show all posts
Saturday, November 7, 2020
Why halogens are insoluble in water ?
Halogens (X2) are "non polar" in nature , they are insoluble in water (polar solvent) but in soluble in non polar solvents like CCl4, C6H6, and CS2 etc.
Friday, October 16, 2020
Is F2 bond is stronger than Br2 ?
Yes F2 bond is stronger than Br2.we know that bond strength of bond depend inversely proportional bond length, hence atomic size of fluorine is smaller than bromine so that F-F bond is smaller than Br-Br bond.
Related Questions:
Which is best known pseudohalide ?
Iodine forms I3- but F2 does not form F3- ions. Why?
Number of lone pair present at central atom of I3- ion and also give hybridisation and shape of ion?
How many maximum atoms of IF7 are present in the same plane ?
What are the Pseudohalogens or halogenoids?
What are Pseudohalides ? and What is similarity with halides?
Thursday, October 8, 2020
Which is best known pseudohalide ?
The best
known pseudohalide is CN-.This resembles Cl- , Br- and I- in the following
respects:
(i) It forms an acid, HCN.
(ii) It can be oxidised to (CN)2 molecule.
(iii) It forms insoluble salts with Ag+, Pb2+ and Hg22+
(iv) It forms large number of complexes
similar to halide complexes,
e.g. [Cu (CN)4]2-
and [CuCl4]2, [Co(CN)6]3- and [CoCl6]3-
(v) Inter-pseudohalogen compounds
ClCN, BrCN and ICN can be formed.
(vi) AgCN is insoluble in water but
soluble in ammonia like AgCl.
Related Questions:
Number of lone pair present at central atom of I3- ion and also give hybridisation and shape of ion?
Thursday, August 6, 2020
Iodine forms I3- but F2 does not form F3- ions. Why?
I2 because of the presence of vacant d– orbitals accepts electrons form
I ions to form I3 ions but F2 because of the absence of d – orbitals does not
accept electrons from F ions to form F3- ions.
Thursday, July 2, 2020
Monday, June 29, 2020
Monday, June 15, 2020
Number of lone pair present at central atom of I3- ion and also give hybridisation and shape of ion?
I3- is polyhalide ion it is formed due to the presence of vacant d-orbital orbital in Iodine atom. It has Sp3d3 hybridisation and linear structure.
How many maximum atoms of IF7 are present in the same plane ?
IF7 has Sp3d3 hybridisation and pentagonal bipyramidal structure that means five Fluorine (F) atom and one Iodine (I) atom lies at equitorial positions and while other two Fluorine (F) atom lies at axial position .So, total atoms lies in same plane will be six (6)
Sunday, June 14, 2020
What are the Pseudohalogens or halogenoids?
We know that dimers of halide ions are called halogens, In the similar way covalent dimers of the pseudohalide ions are called pseudohalogens or halogenoids.
The pseudohalogens known are :
Cyanogen (CN)2
Oxycyanogen (OCN)2
Thiocyanogen (SCN)2
Selenocyanogen (SeCN)2
Tellurocyanogen (TeCN)2
Azido carbon disulphide (SCSN3)2
What are Pseudohalides ? and What is similarity with halides?
The ions consisting
of two or more electronegative atoms of which at least one is nitrogen, that
have properties similar to those of halide ions. These ions are called pseudohalide ions, Pseudohalide ions are
univalent and these form salts resembling halide salts. The pseudohalide ions
are :
Cyanide ions (CN-)
Isocyanide ion (NC-)
Cyanate ion (OCN-)
Fulminate ion (ONC-)
Thiocyanate ions(SCN-)
Isothiocyanate ion (NCS-)
Selenocyanate ion (SeCN-)
Tellurocyanate ion (TeCN-)
Azide ion (N3-) :
Azido carbon disulphide ion (SCSN-3)
The best known
pseudohalide is CN-.This resembles Cl- , Br- and I- in the following respects:
(i) It forms an acid, HCN.
(ii) It can be oxidised to (CN)2 molecule.
(iii) It forms insoluble salts with Ag+, Pb2+ and Hg22+
(iv) It forms large number of complexes similar to halide complexes, e.g. [Cu
(CN)4]2- and [CuCl4]2, [Co(CN)6]3-
and [CoCl6]3-
(v) Inter-pseudohalogen compounds ClCN, BrCN and ICN can be
formed.
(vi) AgCN is insoluble in water but soluble in ammonia likeAgCl.
Related Questions:
Why halogens are
insoluble in water ?
Is F2 bond is
stronger than Br2 ?
Which is best
known pseudohalide ?
Iodine forms I3-
but F2 does not form F3- ions. Why?
Number of lone
pair present at central atom of I3- ion and also give hybridisation and shape
of ion?
How many maximum
atoms of IF7 are present in the same plane ?
What are the
Pseudohalogens or halogenoids?
What are
Pseudohalides ? and What is similarity with halides?
Although
electron affinity of chlorine is higher than fluorine, yet fluorine act as
better oxidizing agent than chlorine? Explain.
Although
electron affinity of chlorine is higher than fluorine, yet fluorine act as
better oxidizing agent than chlorine? Explain.
Why chlorine
trifluoride (ClF3) exists but fluorine trichloride (FCl3) does not?
Why Chlorine
(Cl2) bleaches a substance permanently but sulphuredioxide (SO2) does it
temporarily?
What is the
correct order of electronegativity of Cl atoms in HClO, HClO2, HClO3 and HClO4
?
How does the
thermal stability of oxy acids of chlorine increase with an increase in the
oxidation state of chlorine atom ?
Which of the
following is a strongest acid among oxy acids of chlorine and why? "HClO,
HClO2, HClO3, HClO4"
Which will have
very fast tendency to dimerized ClO2 or NO and why?
Which of the
following is a strongest acid among oxy acids of chlorine and why? "HClO,
HClO2, HClO3, HClO4"
Sunday, February 23, 2020
Which of the following is a strongest acid among oxy acids of chlorine and why? "HClO, HClO2, HClO3, HClO4"
According to Bronsted
Lowery concept, a strong acid has weak conjugate base and vice
versa.
The given oxy acids of
chlorine HCIO, HCIO2, HClO3 and HClO4 and their conjugate bases are CIO-,
CIO2-, ClO3-, ClO4- respectively. These anions are stabilised to
greater extent, due to the presence of π-bond and lone pair, if number of
π-bond increase extent of stabilisation increase. In case of ClO- there is no π-bond hence if form less stable
conjugate base hence act as weak acid while in case of ClO4- it has three pπ-dπ bond which stablised greater extent and form more
stable conjugate base hence it conjugate acid (HClO4) is strongest
acid. Oxy acids of chlorine and their number of pπ-dπ bonds given as:
HOCI (0~Pπ-dπ)
HOCIO (1~Pπ-dπ)
HOClO2 (2~Pπ-dπ)
HOCIO3 (3~Pπ-dπ)
Thus overall order of
acidic strength of oxy acids of chlorine is as:
"HClO < HClO2 < HClO3 < HClO4"
Related Questions:
How does the thermal stability of oxyacids of chlorine increase with an increase in the oxidation state of chlorine atom ?
The thermal stability of oxy acids of chlorine increase on increasing of oxidation number of chlorine atom because on addition of additional oxygen atoms, the number of (pπ-dπ) π-bonds increase which provide extra stability to the molecules. Oxy acids of chlorine and their number of pπ-dπ bonds given as:
HOCI (0~Pπ-dπ)
HOCIO (1~Pπ-dπ)
HOClO2 (2~Pπ-dπ)
HOCIO3 (3~Pπ-dπ)
Thus the overall stability of oxy acids of chlorine are given as:
"HClO < HClO2 < HClO3 < HClO4"
Related Questions:
What is the correct order of electronegativity of Cl atoms in HClO, HClO2, HClO3 and HClO4 ?
According to the question the oxidation states of Cl are in given series of oxy acids as
follows:
HOCI (Chlorine +1 oxidation
state)
HOCIO (Chlorine +3 oxidation
state)
HOClO2 (Chlorine +5 oxidation state)
HOCIO3 (Chlorine +7 oxidation state)
The hydrogen is bonded
to an oxygen rather than to the chlorine in the given oxy acids. Now It is
clear that on addition of additional oxygen atoms with chlorine, it's oxidation
state also Increases hence acidity as well as electronegativity both increase
linearly.
We know that "Electronegativity is the property
of pulling the bonding electron pair towards itself". Higher the oxidation state means more
electrons attracted towards thus the atom has more oxidation state (+) is more
electronegative. So electronegativity of Cl follows:
"HCIO < HCIO2 < HClO3 < HClO4."
Related Questions:
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