8/9/2019 11 Chemistry Sample Paper Solved 03

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SAMPLE PAPER-03 (solved)

CHEMISTRY (Theory)

Class XI

Time allowed: 3 hours Answer Maximum Marks: 70

! I" is #e$ause a$e"o%e has weak &a% der 'aals or$es o a""ra$"io% whereas wa"er mole$ules ha&e

s"ro%* hydro*e% #o%di%*+ "hereore+ ,&a-H0o wa"er is more!

.!

mole$ule o me"ha%e / 1 2 / 0 ele$"ro%s

o me"ha%e $o%"ai%s 0 x !0.. x 0.3ele$"ro%s / !0.. x 0.2ele$"ro%s!

3!

000 $m3o 0! M 4a.C53 $o%"ai%s 0! moles o 4a.C53

So+ 00 $m3o 0! M 4a.C53will $o%"ai% /0.15 x 100

=1000

/ 0!0 moles o 4a.C53

MassNumber of moles =

Molar mass

Mass

0.015 = 106g

Molar mass o 4a.C53/ 0 *

/ 0!0 x 0 / !6 *

2!

o %i"ro*e% will rea$" wi"h 3 o hydro*e%+

. o %i"ro*e% will rea$" wi"h o hydro*e%+ #u" we ha&e . o hydro*e%+ "hereore hydro*e% is

limi"i%* rea$"a%"!

So+ 3 o hydro*e% *i&es . o ammo%ia+

. o hydro*e% *i&es 2 4x 2 = = 1.33L of ammonia3 3

!

!

,H+ "he e%"hal-y $ha%*e a%d ,8+ "he i%"er%al e%er*y $ha%*e are s"a"e u%$"io%s as "hey de-e%d

o% i%i"ial a%d i%al s"a"e a%d %o"e o% "he -a"h!

! 4o! Here+ "he ra"e o e&a-ora"io% is s"ill $o%s"a%" #u" si%$e "he mole$ules *e" dis-ersed i%"o a lar*e

o-e% &olume+ "he ra"e o $o%de%sa"io% rom *as "o li9uid s"a"e $a% %e&er #e e9ual "o "he ra"e o

e&a-ora"es e&e%"ually $om-le"ely!

7!

8/9/2019 11 Chemistry Sample Paper Solved 03

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Material downloaded from http://myCBSEguide.comand http://onlineteachers.co.in

Portal for CBSE Notes, est Papers, Sample Papers, ips and ric!s

a)

Ele$"ro%e*a"i&i"y *oes o% de$reasi%* dow% i% "he *rou- due "o i%$rease i% a"omi$ sie!

#) I" *oes o% i%$reasi%* alo%* "he -eriod due "o de$rease i% a"omi$ sie!

;! Si%$e 4a5H is deli9ues$e%" i% %a"ure a%d a#sor#s #o"h mois"ure a%d $ar#o% dioxide rom air!

The a$$ura"e wei*hi%* is %o" -ossi#le a%d %o" easi#le "o -re-are s"a%dard solu"io% o 4a5H #y

wei*hi%*!

6! I% $ase o ammo%ia+ o%ly o%e lo%e -air o ele$"ro% is -rese%" a%d due "o re-ulsio% #e"wee% l-