CHE-2

BACHELOR OF SCIENCE (B.Sc.)

Term-End Examination

June, 2010

CHEMISTRY

CHE-2 : INORGANIC CHEMISTRY

Time : 2 hours Maximum Marks : 50

Note : (i) Answer all the five questions.

(ii) All the questions carry equal marks.

1. Answer any ten of the following : 10

Write the electronic configuration of the atom whose atomic number is 29.

Which is larger in size, out of the following ions ?

Ca2+ or Zn2+

Which of the following salts behaves as an acid in liquid NH 3 ?

NH4C1 or NaC!

Name the most and least electronegative elements in the periodic table.

Which of the following is a gas ?

BC13 or A/2 C/6

Which of the following is used as a cation exchanged ?

Silica gel, Zeolite, Silicones, Asbestos

Name the acid that converts a mixture of cyclohexanol and cyclohexanone to

adipic acid.

Name the strongest acid out of the following :

HOC10, HOC!, HOC/03 and HOC/02

(i) Arrange the following elements in order of increasing ionisation energy.

Li, Na, K, Rb and Cs.

CHE-2

9 P.T.O.

Among the following name the compound where C has got zero oxidation state.

CH4, CC/ 4, CH,, C/2 and CH3 Cl.

Which of the following is a low spin complex ?

[ Fe (NO2)6 ]4- or [ Fe (H20)6[3+

(I) Write the oxidation state and coordination number of Pt in the complex[Pt (NH3)2 C121

Name the metal for which Van Arkel-de-Boer Process is used for purification.

Write the shape of XeF4 molecule.

(o) Name the isomer of hydrogen molecule in which both the nuclei spin in the samedirection.

2. (a) Why do alkaline earth metals form more complexes as compared to the alkali 2metals ?

The first ionisation energy of Be is greater than that of Li, but the position is 2reversed in case of second ionisation energy. Explain.

Why do Li compounds have more covalent character than K compounds ? 2

(d) Complete any two of the following reactions giving chemical equations : 2

CO2 is bubbled through lime water solution for a long time.

Combustion of diborane in free supply of 02.

(iii) Addition of hypo solution to iodine solution.

(e) Why do halides and hydride of Be polymerise ? 2

3. (a) CC/4 is not hydrolysed while SiC/4 and SnC/4 get hydrolysed easily. Explain. 2

Why tin and lead compounds do not show pwr- d-rr- bonding ? 2

Why H2S is a stronger acid than H2O ? 2

Why is carbon a preferred reducing agent in commercial metallurgy ? 2

Give the resonance structures of nitrate ion, 2

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4. (a) How is boron nitride obtained from borax ? Give the chemical equation. 2

Boric acid can be estimated by titration against a standard alkali solution in the 2presence of glycerol, using phenolphthalein as an indicator. What is the functionof glycerol in the titration ?

Explain why transition metal ions form large number of complexes. 2

Halogens form various types of compounds with oxygen. Is it justified to call 2them halides of oxygen. Give reasons for your answer.

Why can not fluorine be obtained by electrolysis of an aqueous solution of NaF ? 2

5. (a) Write down the IUPAC name of any one of the following compounds : 1

[ Co (NH3) 5 (ONO)1C/2

[Pt (NH3 )4] [Pt C/6]

(b) Write the formula of any one of the following compound : 1

Hexaamminecobalt (III)chloride

Potassiumtrioxalatoferrate (III)

(c) Write short notes on any two of the following : 4

Ionisation or linkage isomerism

Froth flotation process

(iii) Pseudohalogens

Why is the seperation of the lanthanides so difficult ? 2

Why are molten halides often used for preparing metals by electrolysis ? 2

CHE-2

11 P.T.O.

fad d ( •th'.711t )*4,111 1711

\11,1 1 2010

Tri:Crql. -2 : 3TWOri'T

F1-7377 : 2 EPT‘'

37rETT77 3fT : 50

(i) TP-T7 viLl AY JTV viC /

T/7# W-4 3-fW foul l+

Fii-ircriftg-d..4 &--Tw-t 371t q1 F3R- : 10

—4111 t-itaq f 29 1777 TT ,;) cf. T.-I1 FoI ,4-11 44 ftf.7 I

F-1 4--11Cdruc-r TI-749'i 14 A Rh tia,r Th*r-t air t?

Ca2+ 312MT Zn2+

Uci .ff-dit 14 A 31-1:fifTzTr c+, 3TrF •31-ll 044 ,4zR T4ri-dr t?

NH4C/ 37 24-d1 NaC!

TITTErft 3Tf4T a241 tiaN a u riviivito-robor fffr-u7

-4 A 4,1-1-Trr t?

BCI3 3T9-rdi Al2 C16

rii-irrifucr -4 A F. ♦ cbr q9719l 4 1 1-fi1i7 t or .t?

Rik-rcr;r-r,

'HI cfriA c1+11-1Trf -d2-11 fTlquf air -kftrTET 3-11 f 14 fi4laftcr T74 ak,)- 3T1 1

-9-rq fftR

-4 A HI*-4 3#-4T 114 fF1 7

HOC/0, HOC/, HOC/03 -q2TT HOC1O2

CHE-2

13 P.T.O.

(i) s3v41,-( 6,4 t 91, 44 if t-1f77

Li, Na, K, Rb 721T Cs.

(1)

'1 '10 r ~ '1114 flfr m1d4 c ly'{ 374-RIT tr

CH4, CC/4, CH2 C/2 -ff2.11. CH3 Cl.

(k) F-1 4--IFOR5c1 14'4 -'11T fwi sNA, u t t?

[Fe (NO2) 6 ]4- 3121-11 [ Fe (H20)6]3+

(1) [Pt (NH3) 2 C/2 ] Ti-t 4 Pt 01-:1 'ff2TT 4+t•au H±sq f ffftf7 I

dti qrq f 3-14-9-ft-171;emu =4-)1 -1:171)-TT t I

XeF4 37 aiTTIT .F.r7f7

(o) -)s31-131-13j t 6t.-1. -1 1-11 011 cf fffr-u7-r-Tr4 qlrif -fiRft-- fttlfqm-44 sN9but

2. (a) VR NITA v111 3-T14,4-) Tf-t q7t ? 2

Li qc.)-11 14 Be *l "512114 37T H ,0 •71f 31f9t t 31Iff d7 ii 14 #9-Tfff f-111-4-ff 2t I 0,-4ftsit tlf--7

K sI-;) v-H if Li trThrlt t*.t-V4F311 ? 2

tri 47 arr91-ftTff4 et)-1 -cpft : 2

(i) T•:1 t ,II-11 14 CO2 l 'PT ciao tkli(r \An t

02 3Trf-4 -97 ohr q•-f

(iii) 31-Ort t Fcm -wit fa {-44- tf-t I

Bet - (115 -ff2.11 qva-C1=pci t? 2

3. (a) CC/4 Aci 314 r lfzci Is1 6-ff 77rt SiC14 air SnC14 3-717Tt 311:174tff ,7r11 t I 2c4ilts1f ttr77 I

f z i 7?--TT rl5 p-rr - d-rr - 3-744ff 7711 t ? 2

H2O vi-it H2S 31-17f w-if t? 2

ogcltilRi ch --T1-qt14 14 3-7MP:It tcNq 14 t-14-i1 a rc I ,3111 *? 2

3171i 3177 I 2

CHE-2 14

2

2

‘Ft-fffQt-ITf t-14 TT{ qlrs_,K I

tit iir ti t to-r 3-71-)7 1'4041c-I 1;1 -37r-T-nfff 4-11-I ch rcfr144-1 tTrrn 31-7TIFF r 3 fwqr timer t- I 371797 -4 fic.-Nd&t

t?

oq Rs"-11 1.)STR‘ Chti9hH u r tIM 3-17T7 151 tits,-11 1:1-T *Ai t I 2

s3-1I1+11 ,71-r T4T 2T ,71-f <=11 -51TP. tIffrIT -WiT# err rims chc.-If 2

drld 3TEF4 37It mit e r ic11

(e) NaP f rcIri q d. fad 3-77-4a-9 A-X41 WA i -FT-i-f timer ts- ? 2

5. (a) 1 1-1 ci -~ IUPAC 914 -W-u7 : 1

[ Co (NH3)5 (ONO)1C/2

[Pt (NH3)4] [Pt C/6]

(b) 1ii 4 i1ifl citfrO fw-?t7w :

(III) arluq.-.g-, „ „

n i-le.PI LI I-11111i4c:idr-iltd (III)

(c) 1-1 1--IF400 f 0- TIT #1km ffti7 : 4

31-24—qr -4tr ail

591,44

(d) 2A49-r5t 741 it cf4-4 ?

(e) f-1-7 3I LINd-f gItf giq '14-114 t kW. 41R-Icf 3-I- T-P-TT 31:PhTT 44 2

f+-T4-1

CHE-2 15