What are the increasing order of molar conductivity of first group elements in water ?

Li+ < Na+ < K+ < Rb+ < Cs+

Li+ ion being heavily hydrated due to smallest size and hence it's hydrated radius become very large as result has the lowest mobility and Cs+ ion being less hydrated and smallest ionic radius hence has the highest mobility.

Related Questions:

(1) What are the Amphoteric metals ? gives Examples.

(2) Name of total metalloids present in periodic table ?

(3) Total numbers of elements which are liquid at normal temperature is ?

(4) What is Mendeleev's periodic table ? give important features and draw back of Mendeleev's table.

(5) What is atomic density ? give the periodicity of atomic density in periods and groups.

(6) What is atomic volume ? and what is periodicity of atomic volume in groups and periods ?

(7) Why there are 2, 8 and 8 elements in first, second and third periodic of periods table respectively ? Explain.

(8) In alkali metal group which is the strongest reducing agent in aqueous solution and why?

(9) The electron affinity of sulphur is greater than oxygen. Why?

(10) The first ionization energy of carbon atom is greater than that of boron atom, whereas reverse is true for the second ionization energy. Explain.

(11) The electronegativities of B, Al, Ga are 2.0, 1.5, 1.6 respectively. The trend is not regular. Explain.

(12) Li2CO3 decomposes on heating but other alkali metal carbonates don’t. Explain.

(13) Of all noble metals, gold has got a relatively high electron affinity. Explain.

(14 Ionization energy of Boron is smaller than Beryllium even though effective nuclear charge is higher?

(15) What are the increasing order of ionic radii of first group elements in water ?

What are the increasing order of ioni radii of first group elements in water ?

Cs+ < Rb+ < K+ < Na+ < Li+

The ions in solution are present as hydrated ions. The smaller the size of the ion, the greater the extent of hydration. So the size of hydrated ions becomes larger for smaller sized ion and vice versa. 

Related Questions:

(1) What are the Amphoteric metals ? gives Examples.

(2) Name of total metalloids present in periodic table ?

(3) Total numbers of elements which are liquid at normal temperature is ?

(4) What is Mendeleev's periodic table ? give important features and draw back of Mendeleev's table.

(5) What is atomic density ? give the periodicity of atomic density in periods and groups.

(6) What is atomic volume ? and what is periodicity of atomic volume in groups and periods ?

(7) Why there are 2, 8 and 8 elements in first, second and third periodic of periods table respectively ? Explain.

(8) In alkali metal group which is the strongest reducing agent in aqueous solution and why?

(9) The electron affinity of sulphur is greater than oxygen. Why?

(10) The first ionization energy of carbon atom is greater than that of boron atom, whereas reverse is true for the second ionization energy. Explain.

(11) The electronegativities of B, Al, Ga are 2.0, 1.5, 1.6 respectively. The trend is not regular. Explain.

(12) Li2CO3 decomposes on heating but other alkali metal carbonates don’t. Explain.

(13) Of all noble metals, gold has got a relatively high electron affinity. Explain.

(14 Ionization energy of Boron is smaller than Beryllium even though effective nuclear charge is higher?

(15) What are the increasing order of molar conductivity of first group elements in water ?

Though enol form is less stable than keto form, phenol exists in enol form, why?

Enol form is much more stable than keto form because of great stability associated with aromatic ring which is absent in keto form.

What are the difference between Tautomerism & Resonance ?

(1) In tautomerism, an atom changes place but resonance involves a change of position of pi-electrons or unshared electrons.

(2) Tautomers are different compounds and they can be separated by suitable methods but resonating structures cannot be separated as they are imaginary structures of the same compound.

(3) Two tautomers have different functional groups but there is same functional group in all canonical structures of a resonance hybrid.

(4) Two tautomers are in dynamic equilibrium but in resonance only one compound exists.

(5) Resonance in a molecule lowers the energy and thus stabilises a compound and decreases its reactivity. But no such effects occur in tautomerism.

(6) In resonance, bond length of single bond decreases and that of double bond increases e.g. all six C—C bonds in benzene are equal and length is in between the length of a single and a double bond.

(7) Resonance occurs in planar molecule but atoms of tautomers may remain in different planes as well.

(8) Tautomers are indicated by double arrow in between the two isomers but double headed single arrow is put between the canonical (resonating) structures of a resonating molecule.

Related Questions:

(2) How is base strength related to the availability of the electron-pair

(3) Amines are more basic than ammonia why?

(4) What is relative basic strength order 1° amines , 2°amines and 3° amines ? Explain:

(5) Give an explanation for the fact that Guanidine NH=C(CH3)2 is a stronger base than most of amines?

(6) Arrange in correct order of basic Character of aniline, pyrrol, pyridine and piperidine?

(7) What is correct basicity order of pyridine, pyridazine, pyrimidine and pyrazine ?

(8) Give an explanation for the fact that Guanidine NH=C(CH3)2 is a stronger base than most of amines?

(9) Arrange in correct order of basic Character of aniline, pyrrol, pyridine and piperidine?

(10 What is correct basicity order of pyridine, pyridazine, pyrimidine and pyrazine ?

(11) Why pyridine is more basic than Pyrrole?

(12) Why pyrimidine is less basic than pyridine?

(13) Imidazole is more basic than pyridine? Why?

(14) Biological Important of Imidazole and structure:

(15) Pyridine is almost 1 million times less basic than piperidine? Why?

(15) Cyclohexylamine amine is the stronger base than Aniline? Why?

(16) Tetrahydroquinoline amine is the stronger base than Tetrahydroisoquinoline? Why?

(17) Arrange the following in the order of increasing basicity : p-Toluidine, N, N-Dimethyl-p-toluidine, p-Nitroaniline, Aniline. (I.I.T.1986)

(18) Arrange the following in the increasing order of their acid strength : Methyl amine, Dimethyl amine, Aniline, N-methyl aniline (I.I.T, 1988).

4- nitrophenol is more acidic than 3,5 - dimethyl –4-nitro-phenol. Explain.

It is explained in terms of inductive effect and hyperconjugation.