Indira Gandhi National Open University (IGNOU) 2005 B.Sc Chemistry Inorganic - - Question Paper
. CHE-2
BACHELOR OF SCIENCE (B.Sc.) Term-End Examination December, 2005
CHEMISTRY CHE-2 : INORGANIC CHEMISTRY
Time : 2 hours Maximum Marks : 50
Note i Answer all the five questions.
(v) Which silicon compound is used as a cation exchanger ?
(vi) Name the process used for the purification of nickel.
(vii) What is the shape of XeF2 molecule ?
Linear or Angular
(viii)t How do alkali metais dissolved in liquid ammonia behave ?
As Oxidising agents or Reducing agents
(ix) Which one of the following is an interhalogen compound ?
HF, CIF, NaCl
(x) Which one of the following involves hydrogen bridge structure ?
b2H6, c2h6, n2h4 '
(xi) Which of the following is the strongest acvd ?
HF, HCI, HBr, HI
(xii) Write the formula of heavy water.
(xiii) Write the coordination number of Cr in the complex iCr(H20)4Cl2]+
{xiv} What will be the type of complex formed; when P is greater than Aq ? (P = pairing energy)
High spin or Low spin
(xv) What are the two chief constituents of water gas ?
(i)
(ii)
(iii)
(M
2. (a) Define atomic radius. Giving reasons, explain, how
does it vary across the period and down the group. 4
OR
How is beryllium hydride prepared ? Draw the structure of beryllium hydride polymer and discuss the nature of bonding in it.
(b) How is borazole (borazine) prepared ? With the help of necessary equations, give two of its chemical properties. Draw its structure also. 4
OR
Account for any two of the following :
-(i) Ice has lower density compared to water.
{ii) Lithium forms more complexes than other alkali metals.
(iii) Thermal stability of alkali metal carbonates increases down the group.
(c) Why is there a steady increase in boiling point from helium to radon ? 2
3. (a) What is catenation ? Name the element of group 14
which shows maximum catenation. Justify your answer. 3
OR
Compare NaBH4 and LiAlH4 as reducing agents.
(b) With the help of valence bond theory discuss the structure of XeF or XeF4. 2
(c) Give balanced chemical equations for any three of
the following : 1x3-3
(i) Reaction of PCI3 with HI
(ii) Reaction of sodium thiosulphate with I2
(iii) Reaction of SiF4 with water
(iv) Reaction of XeF2 with hydrogen
(v) Reaction of copper metal with concentrated
h2so4
(d) How is aqua regia prepared ? Give its reaction with
gold metal. 2
4. (a) Give any two properties of actinides in which they
resemble lanthanides. 2
(b) Explain any two of the following 2x2=4
(i) Transition metals form Large number of complexes readily.
(ii) Aluminium metal cannot be obtained by reduction of its oxide with carbon.
(iii) NCl and PC13 give different types of products on hydrolysis.
(iv) Fluorine cannot be obtained by electrolysis of an aqueous solution of NaF.
(c) Ionic azides are more stable than covalent azides. Explain. 2
(d) Discuss the amphoteric nature of Sn02 or A1203 with
the help of suitable reactions. 2
5. (a) Write short notes on any two of the following : 4x2=8
(i) Ionisation isomerism and linkage isomerism
(ii) Hydrogen bonding fiii) Electron affinity
(iv) Smelting
(b) Give the formula of one of the following complexes : 1
(i) Potassium trioxalatoferrate(III)
(ii) Hexaamminecobalt(II) chloride
(c) Write the IUPAC name of any one of the following complexes : 1
(i) K2[PtCi6!
(ii) [Co(en)3lCl3
CHE-2 13
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