Indira Gandhi National Open University (IGNOU) 2005 B.Sc Chemistry Inorganic - - Question Paper
CHE-2
BACHELOR OF SCIENCE (B.Sc.) Term-End Examination June, 2005
CHEMISTRY CHE-2 : INORGANIC CHEMISTRY
Time ; 2 hours Maximum Marks ; 50
Note : Answer all the five questions.
1. Answer any ten of the following \ 1.xJO
Which of the following elements is largest in size ?
Mg, Ca, Ba
Name the most electronegative element In the periodic table.
(iii) Write the IUPAC name of the element having atomic number - 105.
(iv) NaH is an example of which type of the following hydrides ?
(a) Metallic hydride
(b) Covalent hydride
(c) Ionic hydride
(v) Which of the following has the highest solubility in water ?
CsF, RbF, KF (vi) Which one of the following is thermally the most stable ? MgC03, CaC03, SrC03
(vii) Which silicon compound is used as a dehydrating agent ?
(viii) Name the most effective method used for the separation of lanthanides,
(ix) What is the shape of XeF4 molecule ?
Square planar or Tetrahedral
(x) Which one of the following is a pseudohalogen ?
(cn)2, i2> hci
(xi) Which one of the following is called inorganic benzene ?
Borazole, Diborane, Borax
(xii) Name the radioactive isotope of hydrogen.
(xiii) What is the other name given to /-block elements ?
Transition elements, Inner-transition elements, Representative elements
r
(xiv) What is the coordination number of cobalt in the complex [Co(H20)3Cl3) ?
(xv) Froth floatation process is used to concentrate which type of the following ores ?
Sulphide ores, Halide ores, Nitrate ores
2. (a) Define ionisation energy. Giving reasons explain how
does it vary across a period and down the group. 4
How is diborane prepared ? Draw its structure and discuss the nature of bonding,
(b) Define hydrogen bond* Discuss intermolecular and intramolecular hydrogen bonding giving suitable example in each case. 4
Account for any two of the following :
(i) Nitrogen exists as a gas but phosphorus exists as a solid.
(ii) Boric acid behaves as a weak monobasic acid.
(iii) CC14 is not hydrolysed but SiCl4 gets readily hydrolysed.
(c) What are fluorocarbons ? Name the product obtained
when C2F4 is polymerised thermally. 2
3. (a) Give any three properties in which lithium or nitrogen or fluorine differ from other members of its respective group. 3
(b) What are different forms of hydrogen molecule ? How
do they differ from each other ? 2
What are silicones ? Give the structure of a linear or a Cross linked silicone polymer
(c) Give balanced chemical equations for any three of
the following : 1x3=3
(i) Reaction of XeF2 with water
{ii) Reaction of A1 (0H)3 with excess aqueous NaOH
(iii) Reaction of SnCl2 with FeCl
(iv) Reaction of concentrated HNO3 on copper metal
(v) Reaction of NCI3 with H20
(d) Why is Contact process preferred over Lead chamber process for the preparation of sulphuric acid ? 2
(i) S03 is not dissolved in water directly during preparation of sulphuric acid.
(ii) An aqueous solution of NaOO is alkaline in nature.
(iii) Noble gas compounds are formed only with oxygen and fluorine.
(iv) Bond dissociation energy of F2 is much lower than expected.
(b) Predict the spin only magnetic moment for Fe2+ ion (At, no, of Fe = 26), 3
Explain the term, lanthanide contraction and discuss its consequences*
(c) Arrange HOC!, HOCIO, H0C102 and HOCIO3 in the increasing order of acidic strength. Give reason for your arrangement. 3
5- (a) Write short notes on any two of the following : 4+4
(0 Werners coordination theory
(ii) Interhalogen compounds
(iii) Froth floatation process
(iv) Metallic hydrides
CHE-2 13 P.T.O.
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