Kerala Plus One Answer Key 2025 Chemistry

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FIRST Y'EAR HTb HER SECONDARY EXAMINATION MARCI{ 2025
PART.I/ITiTIT
STJBJECT: CHEMISTRY

CODE NO: F/
60 SCOR}IS 'l VERSION:
2 HOURS

Qn. Sub Answer Key/Value Points Score Total
No. Qns Score
Answer any 4 questions from I to 5. Each carry I score

limiting rea_qent - Il
1 I

2 (d) or cl (g) I I
a
J (a) or Both statement I and statement II are true I
and statement I is the correct explanation of . f
4 oH' I

5 Number of o bonds:10 I I

Answer any 8 questions from 6 to lS. Each car ry 2 scores
6 Definition o1' Multiple propoftion e
Any one correct example I 2

7 Definition of wavelength I
Wavelength:2.16 xa/ I 2
:8.6a pm

8 boundary surface diagrams of S and
orbitals A
p t+r 2

('l+2
1

,
€

9 (i)-(c), (ii)-(a), (iii)-(e), (iv)-(b) t/zx4 2

l0 state functions - enthalpy, free energy. 1/zx2 2
path function - heat, work t/zx2

t1 Definition of buffer solution I
Any one coffect example I 2

t2 Cl,(NaClO< KCIO,< ClO, a. \ 2 2
t^ a,lai.0nL.ar - A .t.i. J^ L.o,- r'rr, ^^.1-.I V-X,41
(i) Propanone 1/z

,/z
l3 (ii) Propanal 2
Functional Group isomerismelffffr" i
l4 I
It.4 2

15 (i)

O f ur,,-,*
1

2
fe^^"^,,o^-
el
(ii) I

l" f A'-^''*l^
a,.b<4-

Answer any 8 questions from 16 to 26. Each carry 3 scores

l6 (i) Correct equation
Correct substitution /
+
Cor-rect answer /,
3
(i i) (a) & (b) 2

tl (i) L
L
3
(i i) t/z x2
2s,2p

18 (i) Correct i denti fi c ati on fBn2 br^r o fffiHf-1, I

Qt+t 2

+
( ll ) Correct reason lx2 3

t9 (i) D etl niti on o f q-es^^-E'oJnoeq
f co yalent radiu s lo.+covatc/!"y I
(ii) Co.,ec[ reason l$ t\'eAtt'ta
2
1
J

20 (i) Sisnifitance of dinole momenl I -)
e4tahou oa- de\L*lh0"^ *D
(ii) Co representation of the x2
resu Itant dipole moment in CO, and
NF -l

2t (i) A&te - 2.i3013 RTlort I{ I

substitution/ I
a
J
answer I
( ll ) Slo 9 Pov:,.kovra--L/l,a' I

22 (i) Effect of temperature
- r*"-lrp br*Wffi I
Effect of pressure - Ill* pnz.ss LrA-g I J

( il )
Addition of argon at constant volume does not change
the partial pressures or the rnolar concentrations of the
I
substance involved in the reaction. The equilibrium
remains undisturbeo. U
I +be-u0;
"
23 Con ect balanced eouation J
al1s,*0-"*,;'- + e-"-t&olz cL .u^^^^tet- a
J
nvt rtr, -1.,-<>o fur/v-a;%.- ::":
24 (i) Definitipn of inductive effect to.^^L, -"1 Edffift tt- 1
Definition of electromeric
I J
(ii)
I
lnductive effect

25 Newman projections for the eclipsed conformation I
staggered con formation
I 3
More stable-staggered conformatiou
I

26 (i) Br-CHr-CHz-Br I J
(ii) CH 3 I
CH, cH2-B r I

€/u 3

!-
h
Answer any 4 questions from 27 to 31. Each carry 4 scores

27 (i) Statement of Heisenberg's principle g1*"*-io" I
I
Significance of Heisenberg's principie Gv*t@ I 4
(ii) Correct equation I
Correct substitution t/^

Correct answer t/,

28 MO configuration of N, I
MO configuration of Ne, I
Bond order calculatio, of N, I e o = 9 (\e4)d1e*
go\"A"Ar t I 4
Bond order calculation of N %leo = o YI
aa-..
sc."Yd
t-r,/
yr__

29 (i) Statement of l{ess's law
(i i) Correct enthalpy diagram(Born -Haber cycle) a
( % score for each steO e ,+ J
a
4
f ?&rtavL "e.)
30 (i) Definition of heterogeneous equilibriurn I
One example 4
-E! - L'l-sc-ovg)
1

( ii) ec:l Cq. = Q*f I
Qc > Kc so. rh. .*u. ll proceed in the reverse I

31 Delection of N. S. Cl and Br usins sodium fusion extracl
(La-gsan q-v.-.o's L etl- lx4 4
-I-< a^aro\

Qtnt
i' B*^-JI,,^^- k-s qLtq-1 l3s"-Lt+
2. fbahvrz.V'J qq 41 e a7l to
J. Uwv t k6.r s N^,br/ .6) ful- ot\ c.") L I A O P/
+, A^il jaLnL ,M q+?-l t( v{ Ta
5 0y {os7h T
6. %" Jrur.sll Et-rgs W
w
Vot23to42+
QoeT.Et qtgg
?v+ts-rsqse
1 - *"ru') @
8' {\-a-rc. AW 'l+\131\1sa,
l.R,"rf &ou Q*U, q++a5766tt
4