Karnataka 1st PUC Preparatory Exam Question Paper 2026 Chemistry

FOR KARNATAKA 1ST PUC PREPARATORY EXAM EXAM PREPARATION

Karnataka 1st PUC
Preparatory Exam
2026
Question Paper ·
Chemistry
EXAM YEAR TYPE

Karnataka 1st PUC Preparatory Exam 2026 Question Paper
SUBJECT

Chemistry

Notes · Sample Papers · Previous Year Papers · Mock Tests

.
.co s e m

l a
ag
GOVERNMENT OF KARNATAKA
DEPARTMENT OF SCHOOL EDUCATION ( PRE UNIVERSITY)
PREPARATORY EXAMINATION
I P.U.C: CHEMISTRY (34): 2025-26
Time :3 hours Max. Marks : 70

o m m
c
Instructions:
Quest i on paper has F.I V E par t s. Al l par t s ar e compul sory. s e
1.
m
a. P a r t - A carri ese 2 0 m a r k s . E a c h q u e s t i o n carri es 1 mar k. l a
2.
a s ag
b. P a r t - Bl c a r r i e s 1 0 m a r k s . E a c h quest i on carri es 2 m a r k s .
C. a
g
P a r t - C carri esl 8 marks. E a c h quest i on carri es 3 marks.
d. Part -D car r i es10 marks. Each quest i on car r i es 5 mar ks.
e. Part -E car r i es 12 marks. Each quest i on car r i es 4 mar ks.
3. I n Part -A quest i ons, f i r st a t t e m p t e d a n s w e r wi l l be consi dered f or awardi ng marks.
4 Wri t e bal anced chemi cal equat i ons and draw neat l abel ed di agams and graphs wherever necessar y.
5. Di rect answers t o t he numeri cal probl ems wi t hout det ai l ed st eps and speci f i c uni t f or f i nal a n s w e r wi l l not
carry any marks.
m
6.
.co
U s e l og t abl es and si mpl e cal cul at or i f necessary ( use of sci ent i f i c cal cul at or i s not al l owed) .
m st udent s.
7. For a quest i on havi ng ci r cui t di agramf i gurc/ graphdi agram,
s e
al t enat e quest i ons ar e gi ven at t he end of
quest i on paper i n a separat e sect i on f or vi sual l y
l a chal l enged

agP A R T - A
I. Sel ect t he correct opt i on f r o m t he gi ven choi ces. 15x1=15
1. T h e pref i x used f or t he mul t i pl e 1 0 i s
a) M a c r o mi cr o C) n a n o d mi l l i
2. I f t w o vol umes of gas gi ve one v o l u m e of A 2(ng) and one v o l u m e of B , n , t hen mol ecul ar

m
formula o f t he gas wi l l b e ( i ) A , B 2 (ii) A , B 4 (iii) AB

m a) o n l y ( i ) b onl y ( i i ) c) b o t h ( i ) a n d ( i i ) d) o n l y ( i i )
.co
m .co3. A n a t o m of an el ement cont ai ns 19 el ect r ons. I t s nucl eus has 2 0 neut rons. I t s m a s s n u m b e r i s
s e m
se
a) 2 9 b) 2 8 c) 01 39
g la
4. T h e c h e m i c a l propert i es o f a t o m s are cont rol l ed b y n u m b e r o f a
a) n u c l e u s b) prot ons eelectrons d) n e u t r o n s
5. Choose t he cor r ect or der of at omi c and i oni c radi of chl or i ne at om and chl or i de (CI D j on ( i n
P p m ) is
a) 1 3 6 a n d 9 0 ) 167 a n d 99 c) 9 9 a n d 9 9 h 186 a n d 90
6. T h e v a l e n c y o f n o b l e gases i s
a) 3 b) 2 c) I

m
m .co
se gla
- 01
For more Question Papers, Sample Papers, Notes & Syllabus visit Page 1 of 5

Conversion of 0 , ! 0 , involves removal of c l e c t r o n f r o m
7.
b ) B o n d i n g n (Pi ) orbi t al
a) Ant i bondi ng n ( Pi ) or bi t al
d) B o n d i n g o (sigma) orbi t al
c) A n t i b o n d i n g o (si gma) or bi t al
\ 8. T h e e x a m p l e f or i nt ensi ve propert y is
btemperaturc c) c n t h a l p y d) hcat capaci t y
a) i n t e m a l cnergy
systcm w h e n t here i s n o t r a n s f c r o f c n c r g y as
9. T h e c h a n g e i n i nt ernal c n c r g y ( A U ) f or a n i sol at ed
heat or as w o r k wi l l b e c q u a l t o.
a) q b) w d) 1
10. Statement 1: E q u i l i b r i u m is p o s s i b l e o n l y in a c l o s e d s y s t e m at a g i v e n t e m p e r a t u r e .
Statement I I : A t equi l i bri um al l m e a s u r a b l e propert i es o f t he s y s t e m r e m a i n const ant .
Identify the correct statement
a Both statement I a n d II a r e c o r r e c t
b) Both statement I and II are incorrect
c) Statement I is c o r r e c t and statement I I i s i ncorrect .
d) Statement I is i n c o r r e c t and statement I I i s correct .
11. M a t c h t he f ol l owi ng el ement s i n c o m p o u n d s wi t h t hei r oxi dat i on st at e:
Element Oxidation state

A) O x y g e n i n pot assi um superoxi de ) +1
B ) H y d r o g e n i n m e t a l hydri des
i)
2

C) S o d i u m i n r o c k sal t iii) z e r o
D ) Si l ver i n si l ver a m a l g a m iv)-1

a) A ) ! i ) ; B) ! i ) ; C) ! i i ) ; D) ! i v) b Y A ) ! i ) ; B) ! i v) ; C) ! i ) ; D) ! i i )
c) A ) ! i ) ; B) ! i i ) ; C) ! i ) ; D) ! i v) d ) A )! i i ) ; B ) ! i i ) ; C ) ! i ) ; D ) ! i i )
12. W h i c h of the following wi l l n o t s h o w r e s o n a n c c
a) C o H o CaHi : c) C H , N O , d) C o H , C O O
13. A n important propety of carbon t hat h a s m a d e c a r b o n to b e a b a c k b o n c clement of organic
compounds.
) catenation b) al l ot ropy c) i sot opes d) t et raval ency
14. Spat i al a r r a n g e m e n t s o f a t o m s w h i c h can b e convert ed i nt o o n e anot her b y rot at i on a r o u n d a
C - C si ngl e b o n d are cal l ed.
Rot amer s b) M e t a m e r s c) M e s o m e r s d) C h a i n i s o m e r s
15. W h i c h o f t he f ol l owi ng reagent wi l l p r o d u c e t rans al kenes f r o m reduct i on o f al kynes
a) H , / P t b) H , / P d c) H , / N i d N a / l i qui d N H ;
I I . Fi l l i n t he bl anks b y choosi ng t he appropri at e w o r d f r o m t hose gi ven i n t he bracket s:
(st rong aci d, azo, w e a k base, charges, R u b i d i u m , Fl uori ne) 5x1=5
16. T h e el ement di scovered b y spect roscopi c m e t h o d is

02 -

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 2 of 5

.
.co s
e m
l a
ag
T h e el ect r oval ence i s al ways equal t o o n t h e i on.
18. Jf B r o n s t c d aci d i s a st rong aci d t hen i t s conj ugat e wek b
basc i s a
19. T h e el ement ,
whi ch has t he s a m e oxi dat i on st at e i n al l of i t s compounds i s F o u
20. C o m p o u n d ’ A ’ cont ai ns ni t r ogen but Ki el dahl met hod i s not appl i cabl e t o est i mat e t he
amount o
ni t rogen i n c o m p o u n d ’ A’ , T h e n c o m p o u n d A ’ i s 2 0 compound.

m
A n s w e r a n y F I V.Ecoof t he f ol l owi ng.
PART-B
m .
III. E a c h q u e s t i o n carri es t w o m a r k s . 5x2=10
s e
21.
s eg’ms uncer t ai nt y pr i nci pl e. Ment i on any one si gni f i cance of uncer t ai nt y pr i nci pl e. l a
ag
St at e Hei senber
T lh eab o n d angl e of S O , m o l e c u l e i s l ess t han 120 ( r e d u c e d t o 119 ). G i v e reason.
g
22. a)
b) a M e n t i o n t he shape of S O , mol ecul e. (1+1)
23. M e n t i o n t w o f act ors t hat det ermi nes t he percent age coval ent charact er o f t h e i oni c bond.
24. T h e A H of Al , O; i s - 1 6 7 6 kJ. Wri t e t he t hernochemi cal equat i on f or decomposi t i on of A l ; 0 ;
i nt o respect i ve a l u m i n i u m el ement s a n d o x y g e n m o l e c u l e
25. D e f i n e speci f i c heat capaci t y. W r i t e t he rel at i on b e t w e e n Cp, C y a n d R .
26. Pl ot a graph of concent r at i on vs t i me, f or t he at t ai nment of chemi cal equi l i br i um f or a r ever si bl e
react i on: H g g ) + l 2 ( e) ! 2Hl g) f r o m ci t her di r ect i on.
m f or a g i v e n react i on:
27. W h a t are t he ef f ect s o f t he f ol l owi ng condi t i ons o n equi l i bri um
m .co
N g ) + 3H2g) ! 2 N H g )
s e
l a
c t ig
i) addition o f a r g o n g a s at c o n s t a n t volume. ii) i n c r e a s e in pressure
28. Give any two differences b e t w e e n i n d ua ve effect and electromeric ef f ect .
29. A m o n g primary, secondary and tertiary carbocation, w h i c h is m o s t s t a b l e ? Give reason.
30. W h a t happens to the boiling points of isomeric alkanes with increase in branching? Give reason.

PART-C
I V. A n s w e r a n y T H R E E of t he f ol l owi ng. E a c h quest i on carri es t hree m a r k s . 3x3 =9

m
31. D e f i n e i oni zat i on ent hal py. Mention a n y t w o f act ors t hat af f ect s t he i oni zat i on ent hal py.

m
32. Write three conditions f or t h e l i n e a r combination
. c o
of atomic orbi t al s.

. c33.o U s i n g mol ecul ar or bi t al t heor y, cal cul at e bond order and magnet i c propert y of carbon
s e mC
e m molecule.
l a
as 34.a) W h a t i s Lewi s symbol ? Gi ve one si gni f i cance of t hese symbol s.
W r i t e t he L e w i s s y m b o l o f o z o n e mol ecul e.
ag
b) (2 + 1)
35. I n t he f o l l o w i n g r e d o x react i on: 2 F e + 2 H C I! F e C h + H ,
i) W h a t i s t he oxi dat i on n u m b e r o f i ron i n F e C l h ?
ii) W h a t t ype of r e d o X react i on is it?
ii) I dent i f y t he speci es undergo oxi dat i on.
V. A n s w e r a n y T H R E E o f t he f ol l owi ng, E a c h q u e s t i o n carri es t h r e e m a r k s . 3x3 =9
36. a)
m
W h a t i s mol ecul ar f ormul a? H o w i t i s rel at ed t o empi ri cal

.co
f ormul a?

m as
se
For more Question Papers, Sample Papers, Notes & Syllabus visit
03 g l
Page 3 of 5

w

b) Gi ve an exampl e f or a c o m p o u n d whose empi r i cal f ormul a and mol ecul ar f ormul a ar e
Same. ( 2 + 1)
37. A neut r al a t o m has t w o cl ect r ons, ci ght cl ect r ons and si x cl cct rons i n K, L and M shel l s
r espect i vel y. F r o m t hi s pr edi ct ,
i) its a t o m i c number
ii) t ot al nunmber of s-electrons
ii) t ot al n u m b e r o f p-el ect rons.
38. a) Wri t e Gi bb’ s equat i on, t o gi ve t he r el at i on bet ween f r ee energy change, ent hal py change
a n d ent ropy change.
b) W h a t are t he c o n d i t i o n s o f A H a n d A S f or a r e a c t i o n to b e s p o n t a n e o u s at a n y t e m p e r a t u r e ?
(2 + 1)
39. a) W h a t are b u f f e r solutions? G i v e a n e x a m p l e f or neut ral buf f er.
b) Write Henderson-Hasselbalch equat i on t o cal cul at e p H of aci di c buf f er. (2 + 1)
40. For t he f ol l owi ng f i gur es, predi ct i ng t he di r ect i on of r eact i on.

i) ii) ii)

PART-D

VI . A n s w e r any T W O of t he f ol l owi ng. E a c h quest i on car r i es f i ve marks. 2x5=10
41. a) F o r t he c o m p o u n d C l , C H C H ; C H , 0 H
i) W r i t e t h e I U P A C n a m e a n d b o n d l i ne f o r m u l a
ii) I dent i f y f unct i onal group
b) Suggest a m e t h o d t o separat e t he const i t uent s o f t he f ol l owi ng mi xt ures:
i) Mixture of two miscible l i qui ds
ii) A mi xt ure of pl ant p i g m e n t (3+2)
42. a) C o m p l e t e t he f ol l owi ng react i ons
i) 2 C H , + 0 , C u / 5 2 3 K / I 0 0 aum

i i ) CH, +0, Mo,0,/a
(CH,COO)Mn/A
ii) 2 C H , C H , + 3 0 ,
b) Expl ai n R e f o r m i n g react i on wi t h a sui t abl e exampl e. (3+2)
43. a) Write the mechanism of chlorination of benzene.
b) Def i ne pol ymeri zat i on. Ment i on any one use of pol ymer. (3+2)

04
For more Question Papers, Sample Papers, Notes & Syllabus visit Page 4 of 5

. co s e m
m a

s e g l
a a

PART-E
(NUMERICAL PROBLEMS)
VII. A n s w e r a n y T H R E E of t he f ol l owi ng, E a c h quest i on carri es f o u r m a r k s .
m
3x4=12
44.
m
Nat ural l y occurri ng chl ori ne consi st s of t w o i sot opes wi t h at omi c wei ght s
75..c6%o and 24. 249% r espect i vel y.
34. 9 and 39. 5 and
m .co
t hei r abundance
m
Cal cul at e t he r el at i ve at omi c wei ght of
s e
chlorine.
s e g l a
45. Cal cul at e t lhea e n e r g y o f o n e m o l e of phot on of radi at i on w h o s e f requency i s 5 x 1 0 " H z . a
46. T h e c oa m bgu s t i o n o f o n e m o l e o f b e n z e n e at 2 9 8 K a n d I a t m l i ber at es 3267. 0 kJ of heat .
Cal cul at e t he st andar d ent hal py of f or mat i on (AH?) of benzene. St andar d ent hal pi es of
f ormat i on of CO%(g) and H , 0 ( ) ar e -393. 5 kJ m o l ’ a n d - 285. 83 kJ mol r espect i vel y.
47. The value o f K p f o r t he react i on, CO(g) + C(s) o 2 C 0 ( g ) i s 3. 0 at 1 0 0 0 K . I f i ni t i al l y
P o =0. 48 bar and Poo =0 bar and pur e gr aphi t e i s pr esent , cal cul at e t he equi l i br i um par t i al
pressures of CO.

m
.co
48. In Carius method of estimation o f sul phur, 0.466 g of barium sulphate formed from 0.32 g of
o r g a n i c c o m p o u n d . C a l c u l a t e t he p e r c e n t a g e o f s u l p h u r . ( G i v e n a t o m i c m a s s o f S = 3 2
u and
e m
l as
m o l a r m a s s o f b a r i u m sul phat e = 2 3 3 g m o l ’ )

ag
XXXXXXXXXXXXX

m
m .co
m .co s e m
s e g la
g la a
a

m . c
.co e m

se
m
For more Question Papers, Sample Papers, Notes & Syllabus visit las
Page 5 of 5