Uttarakhand Board Class 11 Question Paper 2025 Chemistry

UTTRAKHAND BOARD

Question Paper

qlft:fct> ~ 2024-2025 (Annual Exam 2024-2026)
~q4 - ~tilll.:t nlSti.:J (Subject - Chemistry)
~ .. ~ - 3 '£icT cf>ffl - 11 (Class-11 ) ~ -70
~ (Section-A}
1. ~ ~ct>6<1 ~ - Choose the correct option. 1x10::;10
(I) ~ ~Pl4> 1'iT 4{~1:IQld ~ ~ o11fi,14cf> sloQ'il.:t it>'t,i: CH2 O "qlf 180u t I
~ ~"WtJcp cliT 311ftj4qj $ cflfT ? m
The empirical fonnula and molecular mass of a compound are CH 2O anQ
180u respectively. What will be the molecular formula of this compound ?
(a) C9H_11O9 • {b) C~z.O (c)~~~H 12..O6 (d) C2H4O2
(ii) CH 4 3111j ~ UijifttRt ~ -q "fl ~-lft 'STaT f ?
(a) cf1f' ~&fdt4'1ll (b) ~<t>)uflll fa-~~l~tll l (c) 3t....... 4>-61._&.;c61'-"'~ (d) -=qg-t:Q>-~c61_.._,ll
te.......
• The geometry of CH4 molecule is-
(a) ~quare-p1aner (b) Trigonal bipyramidal (c) Octahedral (d) Tetrahedral
(iii) ~ ~ t<ld: gqRfd ~ ctft ct>tfttl t ?
(a). L\G<PT ?fi.Ollf'i<h ffl (b). L\G q;r ~.:tlc'i<h ffl
(c) L\G q>J ~ m . (d) L\G <PT El-ilc'lch ~--'31i-Ull_ci1_<# 6AT
The Criterion for reaction to be spontaneous is-
(a) L\G being negative (b) L\G being positive . •
(c) L\G being zero _ (d) L\G being positive and negative
(iv) ttqf~cf> -:ftOllt='icf? ii6'~'1 61faf -q-~ 41twil ~tq 5-
The element with most negative electron gain enthaply is-
(a) F . _(b) Cj . _ (c). Br (d) I
(v) 'qq> Gf twflq ~t-1<1'1 <l>T pH 4 t I ~61'-l.=t ~ SliiitGt.=t 31J?Al ~ ttistm ~ -
The pH of an aqueous solution is 4: Hydrogen ion concentration in the
solution will be- •
2
(a 10- moI.L-~ (b) 10-4 mol.L- 1 (c) 10-a mol.L- (d) 10-s mQI.L-1
1

(vi) ~::l"""'T'P ~ ~ cp~d I t-
(a) ~ (b) (1fq tR (c) ~ill6fq, qft Mtfi~ tR (d) ~ w4t 'CR
The electrode potential depends in-
(a Molarity (b Temperature (c) Nature of Conductor (d) ·Au of these
• (vii) ~~~~~ KOH (aq)-+CH3CH20H + Klc151' ~ ~ RqJN it q'it4@ "Rit\"-
(a) ~Rt~1q;:i (b) ~ J:iRl~l4-i (c) ~<.'1)4.=t (d) tt4>~~
Classify the readion CH3CH2I + KOH (aq)~H3CH20H + Kl as given belOYl-
(a) . Electrophilic Substitution • • (b) Nucleophilic Substituion
. (c} Elimination (d) Addition
(viii) ~ atR' ·03 HCI ct\" ~I~ (?R-c6cl ~Iii~ 11) 3tqf.1<1., cf;f ◄t;tll ~ crft-1 ~ mf?
Whatwilf be the inaeasing order of reduction ofalkyl halides with Zinc & dilute HCI?
(a) R-CI < R-I < R-Br (b) R-CI < R...:.sr < R-I
(c) R-I < R-Br < R-CI _ (d) . R-Br < R-I < R-CI • _ _ •
~A~~~~ ~: (x) ct,~ <:I" <f>"-M ftt 1W ~- Rit.:iii ~ Wc151' ~if)l!M (A) "d\!11 cf>Ni,I
(~) ~ 31fcl,a 1Jijf ~I ~ffl"_qi ~ Gtl-< (a), (b), (c).~ (d)'it~ ~.=t4>'< 4lRit(? I
D1rectIon:- .For question No. (Ix) and (x) two statements are given. one
labelled as Asse,:tio~ (A) and other labelled as Reason (R). Select the correct
~ answer to the q~estIo~s from the qodes (a), (b), (c) and (d) as given below.
(a) A~ R ~ ~ ~, R,A ~ ~ c4I~1 cf>xc1f ~ I
Both A and ~ are correct and R is correct explanation of A.
(b) Aom R ~ ~ ~. ~ R,A ~ "ffifi bQl&tl ~ <#xcif ~ I
Both Aaod R are correct ~~tr is not the correct explanation of A.

-- .... -- ---

(c) A~ g, ~ R 11<-..fct t I A is correct bu.t R is incorrect.
(d) A fllfT R Gt-TT 1rffif t I Both A and R are incorrect. ~ J 3!$ ~ I
.
(ix )~ (A ):~ ~~ <C r~~ ~-m t ffllT cj;f ~ ~
f;lrcr~O
cf>i~DI (R) : q~1,ll'j if ~ <PT llW ~ted : ~ mffl
~I .
e the exac t
Assertion (A) : It is impossibie to simultaneously determin
position and correct. r,1.
Reason (R) : The path of an electron in an atom is clearl~ define
~¥fill4'1 ~
(x) ~ ~~'!trq ;:j-1 ~ tJerr ~-2--aflc.>r ~
I •
ffJilq~frll(j ~ ~4>1ltif'icl> ~ 3Jtaql ~Rf~ j~ _q;r ~1'1 fit;;r mt I
ct>NOJ (R) :
ers.
Assertion (A) : Propan-1-ol and Propan-2-ol are posI_tIon isom p or sub-
grou
• ·Reason (R): In position isomers the position of functional
stituent is different. peQuestlons.)
ubl 'Q' {Section-B) A~a \itt~ q JR'1 {DeflniteAnswerTy
1
2. s1~Jl1i4,f <ITT 31Pf ~~aa I cf;T R=ic&l-tt cflJT t ?
What is Heisenberg's uncertainity principle ?
3. 1.00 X 102 'if fct;a~ ~ ajq; ~ ~
1
2
How many significant figures are there in 1.00 x 10 ?
4. i.ls61~ Mst>'i ~ 3TitJ ~ ~'13id ~ ? What do you mean b) Cyclic process ?1
< 1 "~ftitq I • 1
5. ~ ·~ ~~cf ~1~ 8) ~ cS ~'q q; G~ls-
0
?
Give one example each of nucleophilic and electrophilic reagents )
Ques tions
&U&-'11' (Section-C) ~"' 1tf~ ~ ~ ~ery ShortAn
swertype
6. t;J~~ui9i 8~~ ~J\ '11 ~I~ <:110'5-<Cll&tf ~~ ffl .\.liilcl ars forces ?
mc)"ff'<rr~?2
• Define hydrt?Q811 bond. ls ltweaker or stronger than the Vanderwa
7. ~c!1<t~~-~ ~ afrx ~S)~ '1 -;ff.Oflf&iqjdi ~ cflIT ~ 3kR'
g? 2
What is the basic difference between the terms electron gain
enthaply af'.ld
814!/cf"f/ Or
electronegativi!)t?
d-cscif4> $ ~ q;r ~1'11~ ~~~ Pie; ; fcl~l tt <fliT t ?
What is general electronic configuration of d-block elements ? 2
8. il.:feG eilxcb1 NH3 ~ HCOO- c6 tign~ ~ R;t~~ I
and HC00--
Write the con~~te acids for the following Bronsted based :?NH3 2
9. 'qq; fq~flla , ~ ~ bU=O, ~ ~ crm ~s ffl7fT
For an isolated system, L1U = 0, what will be ~s? 2
10. ~&<11 tt'ilqqqd1 it>T ~Glsx 01 tt~d ~t:e cfilrut(! I
Explain chain isomerism with examples. •
2
11. PtkiR=lf&a ~.=ijift ~ q~•ll"jaif 'if)- wfllJ iidl~ Q-
s-
Which atom are Indicated by the1following conflguration
2 3
(a) [Ne]3s 3p (b) J~rs?3d
12. ~~91 ~&~ I 'P ~H&1 if>T ~ tR cfllT WTTcf Q~dl t ? . 2
g point?
What effect does branching of an alkane chain has on its boilin ~ f ~
13. f<l>~ QC:lef A cS 2g <ffl' 1~ urr;r. °4 ~6tfct>-< 'qq; fa<½~it ~lld
~ Gtldl
2
(Py cl)T S:&1'1I'1 Q~fild ~ $)fttc,: I
18g of water.
A solution is prep_ared by adding 2g of a substance (A) to
Calculate the mass percent of the solute (A) ?
14. ~ 2Cl{~)➔CI (g) C/1 ~ .6H ~ LlS ~ ~ cmr
611T-? 2
• For the reactrc?n, 2a1(9)➔C~(g), What are the sign ofdH and dS
?
~&u q fc;tf&q l 2
15. Sc_(q-<~I~ R>fflcf> 21) ~ 31Pfjff ~(9cf~91 qft mxJ qqJOeJi
number 21)
Write the four quantum n~mbers of the last electron of Sc (atomic
. ~~ 3Tef<rr/or
~Tr i ~ ~t.c.ar ~e11~q 1
39 ........+-,'i i-.

19 K ~ l) ~~ct~'f1, meF f ctm
What 1s the number of electrons( ,2proto ns and neutrons in element 1939K•
. )

--- - ===-==~=--===--=--==-~---1
- ----- - ---- - -

~-~~ (Se~tlon-D) ~ Gt1~-ll ~ (Short Answer type Questions)
16• ~a:;,i~d tttt,flGf lf ~(11~(1 ~ '1ft arf<Rftcf>'(Of ~1.UQI 1ffif z6lftit q- 3
MSign oxidation number to the underlined elements in each the follOYJing species?
(a) K2Mn0-1 (b) NaftH4 (c) H2~iO7
17. ffi-~ta~~ ~<al.:a ~ \iGltx 1 ti~d &11@:fl c(;lfijf~ I
0 3
Explain Le-Chatelier's prin_piple with example. artllfTIOr
~ \'J&>'1°fl?-' ~itil~Pi<l> ~ ~ 3re ~ Wij 3Mm3lf ct, tilRi ~-<i4>1
1) ~ ft+:il.U ~ ?
What is relation between the equilibrium constant of the forward and back-
ward reactions of a reversible chemical reaction?
18. ~W~ ~~,:<1 ~ Mcf>l't f ~ M~<f> ~ ~ 3114d ttNufl ~ ~I~ ildl-C(-3
If the configuration of elements Is as follows then find the position of each
element in the periodic table. '
2 5 10 2 (c) 3s23p64s1
(a) 3s 3p (b) 3d 4s
19. 120g ~ i t ~ q-<'il'!J (;m;rr ~ ti(§QI) ~ 4x'i:'!J3IT 'ctr ti®I We£ ci>)fttQ I 3
Find the gram-atoms (number of moles) and number of atoms in 120g
carbon ? ~- ---.... ~.........,ap - ~ 31e/4VOr
3tttN.:t $ ~ arfcffil&6 cnT ~ ~ WG c(;lftiQ fttti~ Si&f'il.:t eRT 69.9°/o
3llll'<91 ffl 30.·1% ~~~1 f?
Determine the empirical formula of an oxide or iron, which has 69.9°/4 iron
and 30.1 % dioxygen by rnass.
20. ai&ii ~,Ra, ~ m ~ ? ~ ~ ~ $ ~ C ~ CV ll ti~¾ ildl&Q I 3
W~at is heat capacity ? Explain the relation betw~n CP and Cv for an ideal gas.
21. '<'ticf5 4q1°ei:t Ricfil"'ti ~ ~1~, c6lftiq I Explain PlancK's Quantum the-ory ?3
22. .:tl~x~U191 ~j~l4'1 fr~-~~ 0.3g cblijPt!-6 4)fl)q; 300k 'ffitr ~ 715mm
GTir 'CR 50ml 11~1U11 ~~I 41ftlct> 1) 11&~1"11 $ gR,~,a "$) ~1°1'11 c:ffl~q I
{300k 'ffltf tR Gie1lli C11lcl =15mm) I 3
In Dumas' method for estimation of Nitrogen, 0.3g of an organic
compound gave 50ml Dumas' nitrogen collected at 300K temp~rature and
715mm pressure. Calculate the percentage composition of nitrogen in ~he
compound. (Aqueous tension at 300K = 15mm). • 8/t./41/0r
~~fcJl<t> ~ ~ ~? ~ Qcf>F< ~ fcl~)qdl~ ildl&Q I -•
What is inductive effect ? Explain its cypes and characteristics.
23. iffi mffl ~ 'Glil- (q;) C~rfOONa <ITT~ ~1~¥1 ~ ~ 11"4 Cl>'ffi i ?. 3
(ti) ~ 3i I~~ '5 I&6 <ITT ~1 li '1 cf ~ q;' ~ ~ <i>'ffi i ?
(rr) ~ cf~-<l&\S ctfr ~ Q~~s'fft;tq; KOH ~ ~ m-8f t ?
What happens when ? (a) CH3COONa is heated with soda lime ?
(b) Methyl Iodide is heated with sodium and ether?
(c) Ethyl chloride reacts with alcoholic KOH? • •
ao,s--T (~ectlon-E) iftEf id'ti~ll J.l'r-r (Long Answ~~~~: Questions)
24. PCl 5 ~ ~ ~4>x 0 1 q;T q1JR cGl~Q 1~ &aftil ~ ~ cl>°r N
~~~mat_? - 4
Oescribe the hybridization in the PCl 5 molecule. Why are the axial bonds • 1
in it longer than the equatorial bonds ? 31Plil1/0r
VSEPR fflcaia <li 31mR' 'CR f¥T . ~ ~ ikfl~~ cf ~li 4'<¥il~ cnT tict>'<ol IBlfa~ I
On the.basis of VSEPR theory, describe the shape of the following mol-
ecules and write the hybridization of the central of the .central atom-
(i) H20 (ii) NH3 (iii) BF · (iv) BeF · .
25. C5H11 31'jti?f ~ ~fffepcrf ~ ~ ~ ti'ilcH-l~~, cb')' tfx-q'il~ - ~
~ ciil4'1 ~<!1<'11 ~ -OH Gil 1\f- J:ITT<f ~&<f>1151c-?f c6' IUPAC 'fl1l ilc11~(;1 14

Write structure of different Isomeric alkyl groups correspon
ding to the mo-
lecular formula C H . Write.lUPAC names of alcoh.ols obta
5 ined by attach-
ment of-OH 9..rq_ups11~t different carbons of the chain.
Pi+11~f&e1 ~ <tft '<Hii4P1c1> :eq)cf>'(Of ~f& q- 31~ /0r
(i) ~ ~ (ii) ~cf>l~fcN:l~cf>xUI
(iii) -~~ ~G1 ~¢x o1 (iv) Q&mtn<'1 cpT ~~ lf f.-1~cllcf>xur
Write chemical equations of the following reactions-
• (i) Wurtz reaction .
(ii) Decarboxylation
(iii) Dehydroha!ogenation . (~ Acidic ?ehydrationof alcohols
26. ~ ~ ~ •IQl tl <ITT ~ afN Plki ~~C 1 ~
~ ijtf'( cflRriq-
4>1~~q; 4)~q; $ flxtj1l~c6 ~ ~~~ ~ ~~~1
~ ~ flxtj11, ~ R fi~tj11, ti~Pia tixtF11 ~ - ~ flxtj1
~w fclffi141 ~-r'l"'t.i-<~~-4r
1 sl ~ tixiFn
~ q;'r ~ m ~- ft5tt~l\iicf> ~ cm- 5elcf>x ~ ~ qx&11
~ ~ ¥,, tt&11➔ ~
cffl" cfflt6ct, ~ R;i{9c6x '31ci,) fi~l ' cffl qg~jq; ~ MG~ei cJR, ~
~ ufT t1cf>ctl 6 I
~;; ~~ ~m ~ -'~~~cf> ~x-q.=fR'lfcn xi~' cn6Cf t' I -~~ lJcf>R
CH3CH2CH2CH2CH2CH C~ CH q;) ~ ~ ti~~cf>
2 2 3 ~ CH3(CH2) 6CH3 ~ ~
MG~d ~ ~ ft¢d l ~I~~~ ffi ct,~ cf>l~P
icf> xtill l1~ ~ 't1-<"if113tT
<PT~ '{ti~d ffit g~ ~c f>T '3441~1 fcm:lTI ~--~ ·tix ~1l
.t" I ~ cf>l~1 ~ 61~;{1'111 ~ .,gt ~\½II ~ , EiIBcb m-c
cm
t+ic f> ~m
nl~1 ~ cm
~-~ ~-e ffl G~Olll ~ I ~ 0, Cl, N ~~IR i
- R:txsi, ut@T ~ I AA 1R ~ - WT ~ (-CH:J ~
~ cm .~~ ~
~ ~ ~ ~ cfcp fch-8)
fsl>lltt'ic6 ~ aRT °16l G~l~lll 11m m} I ~,dRct> ~ \¥1
qil~1 4x~l.l!J3IT cfil' ~
cf>x81_~, W ~ ~m\ii4>dl cl> 1~ ~$ ~ ~M~llcf>
sl~;?IG11 ~ ~ff la~ I
Read th~ passage give below and answer the following question:
Structures of organic compounds are represented in several
ways. The Lewis
stru ~re or. dot structure, dash structure, condensed struc
ture and bond line
·structural fonnulas are some of the specific types. These
structural formulas
can be further abbreviated by omitting some or all of the d~sh
es representing •
- cova1ent bonds and by indicating the number of identical
groups -attached. to
an atom by a subscript. The resulting expression of the com
pound is called a
'condensend structural formula'. T_hus, CH C~ CH?CH2._C
HiCH
be further condensed to GH (CH ) CH . For3furth2er s1mpli~cat 2CH2CH3can
3 26 ion, organic chem-
ists use another way of representing3the si~ctures, in whic
h only lines are
used. it is called bond line structural formula. In this repre
sentation·, carbon
and hydr0Qen atoms are not shown ·and the lines representi
ng carbon-carbon
bonds are dravm in a zig-zag fashion. The only atoms.specifica
llywritt~n are 0, Cl,
N etc. The tenninals de~ote methyl (-CH ) groups (Unless
3 inqicated otherwise by
functional group), while the line junctions deno te carbon atoms bonded to appropri-
ate number of ~ydrogens required to ~tisfy the vale~cY. ~f ~e
(i) •Plki~Rsla 'tf~Pld ~ <ITT l{1'f ~1xi11l~c6 ~
carbori atoms.
'it ™Rs.~~ 2
Expand each of the following condensed formulas into their
complete struc-
tural formulas. •
(a) CH 3Cr.1 2COCH CH (b) CH CH=CH(CH 2hCH
2 3
(ii) PlkiR;f Rsla 4ifl1q;)· <ITT tixt1 ~1~ ~ =ti~Pla 3~ 3

~-f flr · ~ ~ cflfGit;? I
'ri R;f f&Q a~ G.:tct,I
For each of the following compounds, write a condensed 2
formula and also
their bond-line formula~ OH
I
(a} HOCH2CH 2CH 2CH(CH )CH(CH )CH (b) N=C -CH -C:N
3 3 3
♦♦♦♦♦♦ (4)

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