11_chemistry_solved_02_new.pdf

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SAMPLE PAPER-02 (solved)CHEMISTRY (Theory)

Class XI

Time allowed: 3 hours Maximum Marks: 70

General Instructions

a) ll !he "ues!io#s are $om%ulsory&') There are 2! "ues!io#s i# !o!al&$) ues!io#s " !o # are ery shor! a#swer !y%e "ues!io#s a#d $arry one mark ea$h&d) ues!io#s ! !o "0 $arry t$o marks ea$h&e) ues!io#s "" !o 22 $arry t%ree marks ea$h&*) ues!io#s 2& is alue 'ased "ues!io# $arryi#+ 'our marks&

+)

ues!io#s 2 !o 2! $arry 'ive marks ea$h&h) There is #o o erall $hoi$e& Howe er, a# i#!er#al $hoi$e has 'ee# %ro ided i# o#e "ues!io# o*!wo marks, o#e "ues!io# o* !hree marks a#d all !hree "ues!io#s i# *i e marks ea$h& You ha e!o a!!em%! o#ly o#e o* !he $hoi$es i# su$h "ues!io#s&

i) -se o* $al$ula!ors is not %ermi!!ed& Howe er, you may use lo+ !a'les i* #e$essary&

1. Express 32.392800 to four significant figures.

2. Write the correct symbol for the nucleus with:

i. tomic number !" an# mass number 138ii. tomic number 2" an# mass number !!.

3. Why is $a smaller in si%e than l&

'. (raw the structure of

a) 2*3+(imethylpentane

b) '+,henylbut+1+ene

!. -f a tan is full of water coming in an# out at the same rate* then what will happen to the le/el

of water in a tan &". Why e an# g #oes not gi/e colour to flame than the al aline earth metals&

. alculate the molality of the solution if the #ensity of 3 solution of 4a l is 1.2!g5m6.

8. 7a) 4ame the energy which arises #ue to motion of atoms or molecules in a bo#y.

7b) ow is this energy affecte# when the temperature is increase#&

r

$i/e the relationship between isothermal an# free expansion of an i#eal gas.


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9. ,re#ict the formulae of the stable binary compoun#s that woul# be forme# by the

combination of the following pairs of elements:

a) Element 1 an#

b) l an# -

c) ;i an#

#) , an# .

10. Why the bottle containing hy#rogen peroxi#e shoul# be coole# before opening&

11. alculate the stan#ar# enthalpy of formation of one mole of 3 7l)* if the combustion of

one mole of methanol ta es place at 298 < an# 1 atm an# after combustion 2 7g) an# 2

7l) are pro#uce# an# 2" = of heat is liberate#. ssume that the stan#ar# enthalpies of

formation of 2 7g) an# 2 7l) are + 393 =5mol an# +28" = mol respecti/ely.

12. What are the uses of so#ium carbonate&

13. (escribe in #etail the expan#e# octet with suitable examples.

1'. ow woul# you prepare al anes from al enes&

1!. 7a) alculate the concentration of hy#roxyl ion in 0.1 solution of ammonium hy#roxi#e

ha/ing < b > 1.8 x 10 +!* if @A?; total from the relationship $ > @ A;.


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18. We now that !B of solar energy reaching the earth* is absorbe# by earthCs surface

increases its temperature. Ahe rest of heat ra#iates bac to the atmosphere. ;ome of the heat

is trappe# by gases such as * ' * 3* Cs an# water /apours present in the atmosphere.

Ahis causes global warming.

a) ;uggest some measures to #ecrease gas in the atmosphere.

b) $i/e a metho# to sa/e o%one layer.

c) Will the use of solar energy sol/e our problems& omment.

19. omment on the graph below.

20. -f the #ensity of 3 solution of 4a l is 1.2!g5m6* calculate the molality of the solution.

21. 7i) (raw the structural isomers of pentane.

7ii) $i/e the -D, names of the following compoun#s.

a)

b)

c)

22. What are the factors ma#e Ahomson to argue about the amount of #e/iation of the particles

from their path in the presence of electrical or magnetic fiel# #epen#s upon&

23. (uring an e#ucational trip* class - stu#ents saw a beautiful la e in a /illage. Ahey notice#

that some /illagers were washing clothes aroun# the la e an# at some places waste material

from houses was #estroying its beauty. fter few years bac * one of the stu#ent went to the


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same la e again an# saw the la e was co/ere# with algae* stin ing smell an# the water

becomes unusable. Explain the reason for this con#ition.

2'. a) on/ert :

i) en%ene to p+nitrobromoben%ene

ii) Ethyl chlori#e to ethene.

b) $i/e mechanism of a##ition of r to propene.

c) Write a note on rie#el+ rafts al ylation.

r

alance the following eFuation in aci#ic me#ium by half reaction metho#.2 3

2 7 2 4 2 4 2Cr O C H O C H O Cr ++ +

2!. rom the structures gi/en below* answer the Fuestions.

-. 3 @ 2 @ 7 ) @ 3

--. 7 3)2 @ 7 ) @ 3

---. 3 @ 2 @ 2 @ 2 @

-G. 3 @ 7 3) @ @ 3 G. 3 @ @ 2 @ 2 @ 3

G-. 3 @ 2 @ @ 2 @ 3

G--. 3 @ 7 3) @ 2 @

a) Ahe pair of compoun#s that represent chain isomerism.

b) Ahe pair of compoun#s that represent position isomerism.

c) Ahe pairs of compoun#s which are functional group isomers.

#) Ahe compoun#s that form pairs of metamers.e) (istinguish between position an# functional isomerism with an example.

r

on/ert the following:

a) en%ene to en%oic aci#

b) romoethane to utan+1+ol

c) Ethene to ,ropene


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#) Ethyne to ethane

e) ,ropene to ,ropan+2+ol

2". 7a) $i/e one metho# for in#ustrial preparation an# one for laboratory preparation

of an# 2 each.

7b) ;elect the member7s) of group 1' that i) forms the most aci#ic #ioxi#e ii) use#

as semicon#uctors.

7c) Explain structure of (iborane.

r

a) -#entify the functional groups in the following:

b) (raw the bon# notation of heptan+'+one.

c) $i/e the possible isomers for mono substitute#

#) $i/e the possible isomers for #i substitute# ben%ene&

11_chemistry_solved_02_new.pdf

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