KSEEB Model Question Papers For Class 12 Chemistry
KSEEB is the educational council of Karnataka which solely focus on the overall improvement of education by fulfilling its objectives. PUC is the high level exam of school education conducted by KSEEB in which lakhs of students appear every year. To compete others in the exam, students require high level preparation with all available resources to gather knowledge extensively. Model question papers of 2nd PUC is one of the important study materials for guiding them through preparation which are available at official web portal kseeb.kar.nic.in. Students can easily download the pdf of model question papers and practice them regularly besides continuing their regular textbook learning. Chemistry is an important subject comes in science stream for which students have to grasp the concepts and formulas from all chapters. So, all students are advised to follow the provided model question papers which have adequate information about exam.
Model question papers of class 12 are designed by chemistry subject experts with all valuable information about exam pattern, types of questions, marks division for questions to guide students towards exam positively. Chemistry has numerous different concepts and formulas in every chapter for which students have to study the subject thoroughly to be well-versed in it. As the 2nd PUC is the important final level exam students have to give more efforts in their preparation for securing better marks. The exam also opens different options to students for choosing their future career path through higher studies. Besides classroom education students should make their own exam preparation strategy for accomplishing their goals through exam. It is always beneficial for them to practice model question papers thoroughly multiple times for gathering knowledge about exam environment. They should follow the same rule for the subject chemistry too for enhancing confidence and overcoming the difficulties at the same time. With constant practice students will be able to self-analysis which will give them a positive approach towards their preparation. Students are advised to download model question papers of chemistry and practice thoroughly from the below links:
KSEEB Model Question Papers For Class 12th Chemistry 2023 – 24
PART – A
I.) Select the correct option from the given choices.
Aquatic species are more comfortable in cold water rather than in warm water. This is due to
a) solubility of oxygen is more in warm water.
b) solubility of oxygen is more in cold water.
c) solubility of gases increases with decrease of temperature.
d) both (b) and (c).
2.) Which of the following cell was used in Apollo space programme?
a) Mercury cell
b) Daniel cell
c) H2–O2 Fuel cell
d) Dry cell
3.) During electrolysis of aqueous solution of NaCl, the reaction preferred at anode is
a) 2H2O(l) → O2(g) + 4H+ (aq) + 4e
b) H2O(l) + e–→ ½ H2(g) + OH
c) Cl– (aq) → ½ Cl2(g) + e
d) ½ Cl2(g) + e-→ Cl- (aq)
4.) Order of a reaction is determined by
a) balanced chemical equation
b) unbalanced chemical reaction
c) experimental rate expression
d) thermo-chemical equation
5.) Ionic character decreases in the following oxides.
a) Mn2O7> MnO2>MnO
b) MnO> MnO2> Mn2O7
c) Mn2O7>MnO> MnO2
d) MnO> Mn2O7> MnO2
6.) The oxidation state of Fe in [Fe(CO)5] is
a) + 2
b) 0
c) + 3
d) + 5
7.) The gases liberated when primary alcohols react with thionyl chloride are
a) SO2 and H2
b) H2and HCl
c) SO2and HCl
8.) Phenol molecule is less stable than phenoxide ion because
a) phenol resonance structures have charge separation but not in phenoxide ion.
b) phenoxide ion resonance structures have charge separation but not in phenol.
c) bothPhenoxide ion and phenol resonance structures have charge separation
d) bothPhenoxide ion and phenol resonance structures do not have charge separation
9.) Glycerol is an example for
a) dihydric alcohol
b) dihydric phenol
c) trihydric phenol
d) trihydric alcohol
10.)Tollen’s reagent is a
a) silver nitrate solution
b) ammonical silver nitrate solution
c) ammonium nitrate solution
d) silver chloride solution
11.) Carboxylic acids exists in dimeric form even in vapour phase due to
a) Hydrogen bond
b) peptide bond
c) ionic bond
d) metallic bond
12.) The state of hybridization of orbitals of Nitrogen atom in amines is;
a) sp2
b) sp3
c) sp
d) dsp2
13.) Benzene diazonium chloride reacts with phenol to form p-hydroxyazobenzene in
a) acidic medium
b) neutral medium
c) basic medium
d) both acidic and neutral medium
14.) Thiamine is a chemical name of;
a) Vitamin A
b) Vitamin B1
c) Vitamin C
d) Vitamin K
15.) The nitrogenous base adenine form hydrogen bonding with
a) Thymine
b) Cytosine
c) Guanine
d) None of the above
II.)Fill in the blanks by choosing the appropriate word from those given in the brackets:
(phosgene, tin, hydrogen, molecularity, zinc, cellulose acetate)
16.)Thesemi permeable membrane used in the reverse osmosis is ________________.
17.) The number of molecules taking part in the elementary reaction is called _______.
18.) The non-transitional metal present in brass is ___________.
19.) The poisonous gas formed when chloroform is exposed to air and lightis ________.
20.) Solubility of ethylamine in water is due to formation of _______bonding with water.
PART – B
III.) Answer any three of the following. Each question carries two marks.
21.) How does theboiling point of solvent varies, when a non-volatile solute is dissolved in it? Give reason.
22.) Define order of a reaction. For which order reaction the unit of rate of reaction and rate constant is same?
23.) What are chelate ligands? Give an example.
24.) Write the general equation for Finkelstein reaction. What is the role of dry acetone in this reaction?
Photo
25.) Complete the equation and name the reaction:
26.) Name two hormones which regulate the glucose level in the blood.
PART – C
IV.) Answer any three of the following. Each question carries three marks.
27.) Calculate the spin only magnetic moment of M3+ (aq)ion. (Z = 24)
28.) Explain the structure of dichromate ion (Cr2O7 2- ).
29.) What is Lanthanoid contraction? Mention two of its consequences.
30.) Write the IUPAC names and thetype of isomerism forthefollowing complexes
(a) [Co(NH3)5Br]SO4 and (b) [Co(NH3)5SO4]Br.
31.) Using Valence Bond Theory [VBT], explain geometry, hybridisation and magnetic property of [CoF6] -3 ion. [Atomic number of Cobalt is 27].
32.)Drawthe energy level diagram for the crystal field splitting in tetrahedral complexes. Write the relation between Δ0 and Δtfor the complexes having same metal, the same ligand and metal-ligand distances.
V.) Answer any two of the following. Each question carries three marks.
33.) Write any three differences between ideal and non-ideal solutions.
34.) State Kohlrausch’s law of independent migration of ions. Mention two applications of it.
35.) Explain the experimental determination of conductance of electrolytic solution by using Wheatstone bridge.
36.) Derive integrated rate equation forfirst order gas phase reaction
PART – D
VI.) Answer any four of the following. Each question carries five marks.
37.) a.)Write the mechanism involved in the following reaction:
(CH3)3CBr + OH- → (CH3)3COH + Br
Identify the reactant on which rate of reaction depends.
b.) Define stereocenter? How many asymmetric carbon atoms are there in 2, 3 dichlorobutane?
38.)a.) Identify A, B and C in the following reaction:
Photo
b.) Describe the manufacture of methanol from water gas.
39.) a.) An aromatic hydrocarbon ‘A’ having molecular formula C9H12 is oxidised in the presence of air gives compound ‘B’. The compound ‘B’ is treated with dilute acid gives two organic compounds ‘C’ and ‘D’. The compound ‘C’ forms white precipitate ‘E’ with bromine water. Write the chemical reactions with names of A, B, C and E.
b.) Give an example for unsymmetrical (mixed) ether.
40.) a.) Write the chemical equation for the reaction whenbenzaldehyde is slightly heated with acetophenone in the presence of dilute alkali. Give the IUPAC name of the product.
b.) Explain Rosenmund reduction with an example.
c.) Alpha (α) -Hydrogens of aldehydes and ketones are acidic. Give reason.
41.) a.) A Grignard reagent ‘X’ reacts with CO2 (dry ice) followed by acid hydrolysis gives ethanoic acid. Write the chemical equation. Namethe compound ‘X’?
b.)Between methanoic acid and ethanoic acid, which is more acidic? Give reason.
42.)a.)Write the chemical name and structure of Hinsberg’s reagent. 3°- amines do not react with Hinsberg’s reagent. Give reason.
b.) Explain Carbylaminereaction with an example.
43.) a.)(i)The penta-acetate of glucose does not react with Hydroxylamine. What does it indicate?
(ii) Write chemical reaction to show the open chain structure of D-glucose which contains six carbon atom the straight chain.
b.) What is Zwitter ion of an amino acid? Give its general structure.
c.) Name the hormone responsible for the hypothyroidism?
PART – E (PROBLEMS)
VII.) Answerany three of the following. Each question carries three marks.
44.) 100 g of liquid ‘A’ (molar mass 140 gmol-1 )was dissolved in 1000 g of liquid ‘B’ (molar mass 180 gmol1 ).The vapour pressure of liquid ‘B’ was found to be 500 torr. Calculate the vapour pressure of pure liquid ‘A’ if the total vapor pressure of the solution is 475 torr.
45.) The boiling point of benzene is 353.23K. When 1.8g of non-volatile solute was dissolved in 90g of benzene, the boiling point is raised to 354.11K. Calculate the molar mass of the solute. (Given Kb for benzene is 2.53Kkgmol–1 ).
46.) At 298K, the EMF of the cell: Mg(s) |Mg2+(Q)||Ag+ (0.01)|Ag(s)is 3.022V. Calculate the value ‘Q’. (Given: EoMg2+/Mg = -2.37V and EoAg+/Ag = 0.80V)
47.) The resistance of 0.01M acetic acid solution is found to be 2220Ω, when measured in a cellhas two electrodes of area of cross section 3.85cm2 placed 10.5cm apart. Calculateconductivity.
48.) For a first order reaction, the half-life period is 120 min. Calculate the time required to complete 90% of the reaction.
49.) The rate constants of a reaction are 2 × 10-2 s -1 at 300K and 8 × -10-2 s -1 at 320 K. Calculate the energy of activation of the reaction. (Given: R = 8.314JK-1mol-1 ).
34. CHEMISTRY MQP II PUC 2023-24
- Click on the below option on the subject.
- You can download question papers.
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