Karnataka 1st PUC Mid Term Question Paper 2025 Chemistry

Government of Karnataka
Karnataka Secondary Education Examination Board

Question Papers
Mid Term

IPUCMID-TERM EXAMINATION OCTOBER-2025
Time : 3 Hours SUBJECT: CHEMISTRY (34) Max Marks : 70
PART-A
Select the correct option from the given choices. 15x1=15
1. The SI unit of amount of substance is
a) Kilogram b) candela c) mole ) ampere
2. The number of moles of solute present in one litre ofa solution is called as
a) Mole fraction b) Molality c) Molarity d) Mass percent
37
3. The number of neutrons present in Cl and Cl respectively are
a) 20 and 18 b) 17 and 20 c) 18 and 17 d) 37 and 35
4. Statement I: Heisenberg uncertainty principle rules out existence of definite paths or trajectories
of electrons and other similar particles
Statement II : The efect of Heisenberg uncertainty principle is negligible for motion of macroscopic
objects.
a)Both Statement Iand II are correct
b) Both Statement I and II are incorrect
c) Statement I is correct but statement II is incorrect
d) Statement I is incorrect but statement IIis correct
5. 18g of water contains
a) 3.01lx10® oxygen atoms b) 6.022 x10* oxygen atoms
c) 2x6.022 x10 oxygen atoms d) 3x6.022 × 10 oxygen atoms
6. The enthalpies of all elements in their standard states are
a) Unity b) Zero c) less than zero d) different for each element
7. The intensive property among the following is
a) Internal energy b) Mass c) Volume d) Temperature
8. An example for polar molecule is
a) O, b) H, c) H,0 d) N,
9. The series of spectral lines in hydrogen spectrum that appear in the visible region of the
electromagnetic spectrum is
a) Lyman series b) Balmer series c) Paschen series d) Brackett series
10. Match the items of List-I and List-II
List-I List-II
A)Basic oxide i) CO
B) Acidic oxide i) Al0,
C) Amphoteric oxide i) Cl0,
D)Neutral oxide iv) Na,O
a) A-i, B-i, C-ii, D-iy b) A-iv, B-ii, C-ii, D-i
c) A-ii, B-i, C-iv, D-ii d) A-iv, B-i, C-ii, D-ii
11. C, and C, are related as
a) C= C, + R b) C,= C, + R )C-C,-R d) C= C,R
12. Aniline-water mixture can be separated by
a) Sublimation b) Fractional distillation
c) Steam distillation d) Distillation under reduced pressure
(P.T.O.)

-2
13. Intramolecular hydrogen bond is present in
a) m-nitrophenol b) p-nitrophenol c) o-nitrophenol d) phenol
14. F-B-F bond angle in BF, molecule is
a) 120° b) 109.5o c) 180° d) 1070

15. The more stable free radical is
a) H, b) CH,H, c) (CH),H d) (CH)
II Fillin the blanks by choosing the appropriate word from those given in the brackets
5x1=5

(electrophile, Octahedral, Taxol, J.J. Thomson,lower, higher)
16. Electron was discovered by
17. is used in the treatment of cancer.
18. Areagent that takes away an electron pair from reactive site is called
19. SF. molecule has geometry.
20. The bonding molecular orbital has energy than antibonding molecular orbital.

PART-B
II Answer any FIVE of the following. Each question carries TWO marks 5x2=10
21. State law of Definite proportions.
22. How many significant figures are present in the following?
i) 0.0025
ii) 2.0034
23. Give De Broglie equation and explain the terms.
24. State Pauli's exclusion principle.
25. Define isolated system. Give an example.
26. State Modern periodic law.
27. Among P, S, CI, Fwhich element has
i) most negative electron gain enthalpy ? and
ü) least negative electron gain enthalpy ?
28. Give any two differences between sigma and pi-bond.
29. Write the Lews dot structure of i) H,0 i) CO,
30. Give an example each for Benzenoid and non-Benzenoid aromatic compounds.
PART-C
IV Answer any THREE of the following. Each question carries THREE marks. 3x3-09
31. a) How does electronegativity vary across the period and down the group ? (2)
b) Name the most electronegative element in the periodic table. (1)
32. Explain SP² hybridization by taking BCl, as an example.
33. Based on molecular orbital theory, write the electronic configuration, bond order and magnetic
property of Lithium molecule.
34. Mention the shapes of following molecules based on VSEPR theory.
i)NH, i) PC1, iü) CH,
35. a) Define dipole moment.
b)The resultant dipole moment of NH, is greater than NF,. Give reason.
V> Answer any THREE of the following. Each question carries THREE marks. 3x3-09
36. a) Define Limiting reagent. (1)
b) Mention the prefixes for 10-and 10-12. (2)
37. Give any three postulates of Bohr's model for hydrogen atom.
38. Give the electronic configuration of copper and also the values of n and 1for the electrons
present in itsoutermost shel.
(P.T.O.)

-3
39. a) State first law of thermodynamics and write its mathematical form. (2)
b) What is the entropy for a perfectly crystalline solid ? (1)
40. a) Write the relationship between AH and AU for the reaction. (1)
Nae t 3Ha0)
b) State Hess' law of constant heat summation. (2)
PART-D
VI Answer any TWO of the following. Each question carries FIVE marks. 2x5-10
41. a) How do you detect the presence of carbon and hydrogen in organic compound by copper
oxide method ? (4)
b) Name any one element detected by Lassaigne's test. (1)

42. a) For a compound CH, CH, --CH,,
i) Write the IUPAC name and bond line formula. (2)
i) Identify the functional group. (1)
i )Calculate the number of o and n bonds (2)
43. a) Give any two differences between inductive effect and resonance effect. (2)
b) Which type of structural isomerism is shown by
i) n-pentane and isopentane
i) Methoxypropane and Ethoxyethane (2)
c) Give an example for heterocyclic aromatic compound. (1)

PART-E Numerical Problems)
VII Answer any FOUR of the following. Each question carries THREE marks. 4x3=12
44. Find out the value of Equilibrium constant for the following reaction at 298 K
2NH, (g) + C0,(g) NH,CONH,(aq) + H,0(0)
Standard Gibbs energy change (AG°) at a given temperature is 13.6 kJ mol'and
R = 8.314 kJ-'mol-1

45. The heat of combustion of methane is -890.65 kJ mol and heat of formation of CO, and
H,0 are -393.5 and -286.0 kJ mol respectively. Calculate the heat of formation of methane.
46. Calculate the wavenumber and frequency of yellow radiation having wavelength
5800 A°. (c =3x 10® m/s)
mass is
47. A compound contains 4.079% Hydrogen, 24.27% Carbon and 71.65% Chlorine. Its molar
98.96g mol. Give its Empirical and molecular formulae.
[Atomic mass ofH= lu, C= 12u, Cl= 35.5u]
48. In Carius method of estimation of halogen 0.15g of an organic compound gave 0.12 g of AgBr.
Find out the percentage of Bromine in the compound.
fGiven :Atomicmass of Br =80u and Molar mass of AgBr =188g mo

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