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DELHI PUBLIC SCHOOL BHOPAL

PRE BOARD EXAMINATION -II (2013- 2014)

SET-A

CLASS: XIIDate of Exam : 06/01/2014 Max. Marks : 70

Time Allowed : 3 hrs. SUBJECT: CHEMISTRY o. of !a"es : 04ame: ###################################### $oll o######### %lass####### &e'########

General Instructions:

1. All questions are compulsory.

2. Q.1 to Q.8 are very short answer questions, each of 1 mark. Answer these in one word or

about one sentence each.

3. Q. to 18 are short answer questions each of 2 marks. Answer these in about 3! words each.

". Q.1 to 2# are short answer question each of 3 marks. Answer these in about "! words each.

$. Q.28 to 3! are lon% answer question each of $ marks answer these in about #! words each.

&. 'se lo% table if necessary calculations are not permitted.

(.1. )i*e the +,!A% -ame of 2 %2 %2 % %2. 1

(.2. hat is the -m5er of atoms i- a -it 'ell of a .%.%. 1

(.3. h8 is *a9or 9ressre of a soltio- of a "l'ose i- water lower tha- that of water 1

(.4. )i*e a- exam9le of metal refi-ed 58 Mo-ds 9ro'ess. 1

(.;. Draw the "eometr8 of &4. 1

(.6. h8 is adsor9tio- alwa8s exothermi' 1

(.7. rite the +,!A% -ame of 6 1

(.?. %8'lohexa-o-e forms '8a-oh8dri- i- "ood 8ield 5t 2@2@6trimeth8l '8'lohexa-o-e does -ot.

h8 1

(.B. Defi-e : =a> +soto-i' soltio- =5> Ca-t offs fa'tor 2

(.10. The rate of most of the rea'tio-s 5e'ome do5le whe- tem9eratre is raised from 2B? to 30?

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(.11. Des'ri5e the role of the followi-": 2

=a> a% i- the extra'tio- of A" from a sil*er ore.

=5> %r8olite i- the extra'tio- of almi-im from 9re almi-a.

(.12. rite a-8 two differe-'e 5etwee- red'i-" a-d -o- red'i-" s"ars. 2

(.13. &ha-ti@ a domesti' hel9er of Mrs. A-radha@ fai-ted while she was mo99i-" the floor. Mrs.A-radha took her to the -ear58 hos9ital where she was dia"-osed to 5e se*erel8 a-aemi'. Do'tor

9res'ri5ed a- iro- ri'h diet a-d mlti*itami-s s99leme-ts to her. Mrs. A-radha s99orted her

fi-a-'iall8 to "et the medi'i-es. After o-e mo-th &ha-ti was dia"-osed to 5e -ormal.

=a> hat *ales are dis9la8ed 58 Mrs. A-radha

=5> )i*e a- exam9le of water sol5le *itami-.

='> ame the *itami-s whose defi'ie-'8 'ases 9er-i'ios a-aemia. 1FGFG2

(.14. rite the me'ha-ism of h8dratio- of ethe-e to etha-ol. 2

(.1;. rite 'hemi'al eatio-s to illstrate the followi-" rea'tio-s. 2

=a> $iemer Tiema-- $ea'tio-

=5> %o9li-" rea'tio-

(.16. )i*e a 'hemi'al test to disti-"ish 5etwee- the followi-" 9air of 'om9o-ds. 2

H

=a> %3%H%3 I %3%H =5> I %2;H

(.17. A''o-t for the followi-": 2

=a> Eth8l iodide -der"oes &2rea'tio- faster tha- eth8l 5romide.

=5> !he-ol is more a'idi' tha- etha-ol.

(.1?. =a> &tate $aolts law for soltio-s of o-*olatile soltes. 1F12

=5> Me-tio- a-8 two a99li'atio-s of e-r8s Jaw.

(.1B. Metal KL 'r8stallises i- .%.%. latti'e. +f the ed"e le-"th of the -it 'ell is 4.0710?'m a-d the

de-sit8 of the 'r8stal is 10.; "/'m3@ 'al'late the atomi' mass of sil*er. 3

(.20. =a> rite the str'tres of mo-omer of 8lo-6. 1F23

=5> rite a-8 two differe-'e 5etwee- thermo9lasti' a-d thermosetti-" 9ol8mer.

OR

=a> rite the str'tre of mo-omer of !A.=5> rite a-8 two differe-'es 5etwee- elastomer a-d fi5res.

2

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(.21. =a> hat is am5ide-tate li"a-d )i*e a- exam9le. 1F23

=5> or the 'om9lex i%l42write the h85ridiNatio- t89e a-d sha9e of the 'om9lex.

(.22. Ex9lai- the followi-" terms: 3

=a> Ele'tro9horesis =5> %oa"latio- ='> T8-dall effe't

(.23. A''o-t for the followi-": 3=a> &"ar "ets 'harred o- additio- of 'o-'. 2&H4.

=5> Thermal sta5ilit8 of water is m'h hi"her tha- that of 2&.

='> %io- exists 5t %!does -ot exist.

(.24. Defi-e:

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=a> Hrder of rea'tio-

=5> Eleme-tar8 ste9 i- a rea'tio-='> Threshold e-er"8

(.2;. =a> %om9lete the rea'tio-. 3

%3

F + O

=5> ow well 8o 'o-*ert 9he-ol i-to 5e-Ne-e

='> !he-8l meth8lether rea'ts with + to "i*e 9he-ol a-d meth8l iodide a-d -ot

iodo5e-Ne-e a-d meth8l al'ohol. h8

(.26. A tra-sl'e-t white wax8 solid KA o- heati-" i- a- i-ert atmos9here is 'o-*erted to its allotro9i'

from KP. Allotro9e KA o- rea'tio- with *er8 dilte aeos %r 2H72F eF2F FO

=ii> %rH42F FO

=iii> M-H4F %2H42F FO

=5> Tra-sitio- metals are well k-ow- to form 'om9lex 'om9o-d. h8

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='> Qr I f are 'alled as twi- eleme-ts. h8

(.2B. =a> ow m'h 'har"e is reired for the red'tio- of 1 mole of %F2to %. ;

=5> &tate two ad*a-ta"es of 2 H2fel 'ell o*er ordi-ar8 'ell.

='> &il*er is ele'trode9osited o- a metalli' *essel of total srfa'e area of B00 'm258 9assi-" a

'rre-t of 0.; A for 2 hors. %al'late the thi'k-ess of A" de9osited. )i*e-@ de-sit8 of

A" 10.; "m/'m3. Atomi' mass of A" 10? .

OR

=a> ow m'h 'har"e is reired for the red'tio- of 1 mole of M-H42to M-F2 ;

=5> rite a-8 two a99li'atio-s of &il*er is ele'trode9osited o- a metalli' *essel of total srfa'e area of B00 'm258 9assi-" a

'rre-t of 0.; A for 2 hors. %al'late the thi'k-ess of A" de9osited. )i*e-@ de-sit8 of

A" 10.; "m/'m3. Atomi' mass of A" 10? .

(.30. =a> A 'om9o-d A %26H o- oxidatio- 58 !%% "a*e P@ whi'h o- treatme-t with aeos

alkali a-d s5see-t heati-" "a*e %. KP o- oxidatio- with A h8dro'ar5o- %;10does -ot rea't with 'hlori-e i- dark 5t "i*es a si-"le mo-o'hloro

'om9o-d %;B%l i- 5ri"ht s- li"ht. +de-tif8 the h8dro'ar5o-. 2F3;

=5> %arr8 ot the followi-" 'o-*ersio-s:

i> Pe-Ne-e to di9he-8l

ii> Etha-ol to 5t18-e

iii> 9ro9a-1ol to 9ro9a-2ol

R R R

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