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Sample Paper – 2011

Class – XI

Subject – Chemistry

Time : 1:30 hr MM : 60

I. Answer the following Questions: ( 1mark each)a) alculate the molecular mass of methane (!⁴) an" glucose ( !#$% ) molecule.⁶ ⁶&) alculate the molarit' of a solution of ethanol in water in which the mole fraction of

ethanol is 0.00(assume the "ensit' of water to &e one).c) The mass of an electron is .1*10+,#-g.If its kinetic energ' is 3.0*10+$⁶.alculate its

wa/elength.") rite the general electronic configuration of "&lock an" f&lock elements.e) rite the atomic num&er of element 2resent in the thir" 2erio" an" se/enteenth

grou2 of 2erio"ic ta&le.f) onsi"ering the elements 4l4%454 the correct or"er of their chemical reacti/it' in

terms of oi"i7ing 2ro2ert' is:

8l8%85 8%8l85 l88%5 %8858lg) hich out of 5!, an" 5, has higher "i2ole moment an" wh'9h) hat are intermolecular forces9i) rite lewis structure of $!$ an" 5$. ) hat are isoelectronic s2ecies9 ;i/e eam2le.

II. Answer the following "ucational Eortalswww.icseguess.com F www.ignouguess.com F www."ulife.com F www.magicsense.com

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c) a)!ow man' su&shells are associate" with n9

&)!ow man' electrons will &e 2resent in the su&shells ha/ing ms /alue of G for

n.

") !ow woul" 'ou e2lain the fact that the first ioni7ation enthal2' of so"ium is lowerthan that of magnesium &ut its secon" ioni7ation enthal2' is higher than that of

magnesium.e) A /essel of 1=0 ml ca2acit' contains amount of a gas at 3DH an" 1.= &ar 2ressure.

The gas is transferre" to another /essel of /olume 1C0ml at 3DH. hat woul" &e its

2ressure9f) escri&e the &on"ing in %$ molecule an" show the increasing or"er of energies of

/arious molecular or&itals for %$.

I@. Answer the following