Aluminum
crystallizes in a closed
packed structure. Its atomic radius is .
(a)
What is the length of the edge of the unit
cell? 1
(b)
How many such unit cells are there in a 2.00 m3 piece of aluminum?
1
(a)
What is fuel cell? Write the electrode reaction of a fuel cell which uses the
reaction of hydrogen with
oxygen.
(b)
Write the cell formulation and calculate the standard cell potential of the
galvanic cell in which the following reaction takes place:
Rearrange
the compounds of each of the following sets in order of reactivity towards displacement:
(a)
2-Bromo-2-methyl butane, 1-Bromopentone, 2-Bromopentone 1
(b)1-Bromo-2-methyl
butane, 2-Bromo-2-methyl butane, 3-Bromo-2-methyl butane. 1
(c)
1-Bromobutane, 1-Bromo-2, 2-dimethyl propane, l-Bromo-2-methyl butane 1
(a)
Explain the principle of electro dialysis.
1
(b)
In which
gas will be absorbed more rapidly on the surface of charcoal and why?
1
(c)
How are multi molecular colloides different from macromolecular
colloids? 1
Name
the following halides according to IUPAC system and classify them as alkyl, allyl,
benzyl (primary, secondary, tertiary), vinyl or aryl halides:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
.
(a)
Assign reason for the following :
(i)
Transition metal ions are usually colored.
1
(ii)
Transition elements exhibit variable oxidation
state. 1
(iii)
Interstitial compounds are well known for transition metal.
1
(b)
Give balanced chemical equation of two reactions in which acts as
an oxidizing agent in acidic
medium. 2
(a)
Account for the following :
(i)
Electrophilic substitution in benzoic acid takes place at meta
position. 1
(ii)
Carboxylic acids have higher boiling points than alcohols of comparable
molecular mass. 1
(b)
How will you bring about the following conversions:
(i)
Propanone to propene, 1
(ii)
Benzoic acid to benzaldehyde, 1
(iii)
Ethenol to 3-hydroxybutenal ? 1
What
is meant by Vant HofFs factor?
The osmotic
pressure of 0.0103 molar solution of an electrolyte is found to be 0.70 atm at 27°C.
Calculate the Van't Hoff factor. [R = 0.082 Leter ] What
conclusion do you draw about the molecular state of the solute in the
solution? 5