Class 12 PT I Question Paper 2024-25 Chemistry

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QUESTION PAPER
Question Paper for CBSE Board, KV Schools,
State Board following NCERT Syllabus

PT 1 | PT 2

Question Paper based on NCERT Syllabus
CBSE Board Question Paper / KV Schools Question Paper
FIRST SHIFT
CLASS XII SUBJECT- CHEMISTRY
Time-90 Min Max Marks-40

Q-1. The Values of Van’t haff factors for KCl, NaCl and K2SO4 respectively are ______________

(a) 2, 2and 2 (b) 2, 2 and 3
(c) 1, 1 and 2 (d) 1, 1 and 1

Q-2. Which of the following aqueous solution will have highest boiling point

(a) 1.0 M KCl (b) 1.0 M K2SO4

(C) 2.0 M KCl (d) 2.0 M K2SO4

Q-3. The Colligative property used for the Determination of motar mass of polymers and proteins

(a) Osmotic Pressure (b) depression freezing
(b) Relative lowering in vaper pressure (d) elevation is boiling point

Q-4. The Correct cell to represent the following reactions

Zn + 2Ag+ Zn2+ + 2Ag

(a) 2 Ag I Ag+ I I Zn I Zn+
(b) Ag+ I Ag I I Zn2+ I Zn
(c) Ag+ I Ag+ 11 Zn I Zn2+
(d) Zn I Zn+ I I Ag+ I Ag

Q-5. Charge Carried by 1 mole of electron is

(a) 6.023X1023 Coulomb (b) 9.65X104 Coulomb
(b) 1.6X10-19 Coulomb (d) 6.28X1019 Coulomb

Q-6. The quantity of charge required to obtain one mole of aluminum from Al2O3 is ________

(a) 1F (b) 6F (C) 3F (d) 2F

Q-7. A electrochemical cell can behave like an electrolytic cell when _____

(a) Ecell =0 (b) Ecell > Eext
(b) Eext > Ecell (d) Ecell = Eext

Q-8. The rate constant of reaction is 2.0 x 10-6 mole-2 L2 S-1 the order of the reaction is

(a) 0 (b) 2 (c) 1 (d) 3

Q-9. It 75% of the first order reaction was completed in 32 minutes 50% of the some reaction would be completed in

(a) 8 min (b) 4 min (c) 16 min (d) 24 min

Q-10. Which of the following is affected by catalyst?

(a) H (b) G (c) Ea (d) S

Read the given passage and answer the question that follows.

“ a Lead storage battery is the most important type of secondary cell having a lead anode and a grid of lead
packed with PbO2 as cathode. A 38% solution of Sulphuric acid is used as electrolyte (density=1.294 g mL-1)

The battery hold 3.5 L of the acid during the discharge of the battery. The density of H2SO4 falls to 1.139 gm
L-1 (20% H2SO4 by mass)

Q-11. Write the reaction taking place at the cathode when the battery is in use

Q-12. How much electricity in terms of faraday is required to carry out the reduction of one mole of PbO2?

Q-13. What is the molarity of sulphuric acid before discharge?

In the following questions two statements are given one labeled Assertion (A) and the other labeled Reason
(R) Select the correct answer to these question from the codes (a) (b), (c) and (d) as given below

(a) Both A and R are correct statement and R is the correct explanation of the A
(b) Both A and R are Correct statements but R is not the correct explanation of the Assertion (A)
(c) Assertion (A) is correct but Reason (R) is incorrect statement
(d) (A) is incorrect but (R) is correct statement

Q-14. (A) Ecell should have a positive value for the cell to function

(R) Ecathode < Eanode

Q-15. (A) Copper sulphate cannot be stored in zinc vessel

(R) Zinc is less reactive then copper

Q-16. (A) The mole cularity of the reaction H2+Br2 HBr appears to be 2

(R) Two molecules of the reactants are involved in the given elementary reaction.

Q-17. (A) Order of the reaction can be zero or fractional

(R) We cannot determine order from balanced chemical equation

Q-18. (A) Molarity of solution charges with temperature

(R) Molarity is a colligative property.

Q-19. (A) An ideal solution obeys henry’s law

(R) Iran Ideal solution solate – solate as well as solvent solvent interaction Q-20. (A) Osmotic pressure is a
colligative property.

(R) Osmotic pressure is directly proportional to molority

Q-21. State Honery’s law. Write its one application. What is the effect of temperature on solution of gases in liquid?

Q-22. calculate the boiling point of solution when 2g of Na2SO4 (M=142g mole-1) was dissolved in 50g of water
assuming Na2SO4 undergoes complete ionization (Kb of water=0.52kg mole-1)

Q-23. The resistance of a conductivity cell containing 0.001 M KCl solution at 298 K is 1500 ohm what is the cell
constant if conductivity of 0.001 M KCl solution at 298 is 0.146X10-3 S cm-1

Q-24. Explain the reactions occurring during the corrosion of iron in the atmosphere.

Q-25 for a first order reaction show that time required for 99% completion is turce the time required for the
completion of 90% of reaction

Or

Define half life of a reaction. Write the expression of half life for

(i) Zero order reaction and (ii) first order reaction

Q-26. The activation energy of a reaction is 75.2 kg Mole-1 in the absence of a catalyst lowers to 50.14 KJ mole-1 with
a catalyst how many time will the rate of reaction grow in the presence of a catalyst if the reaction proceeds at 250 C

Q-27. (i) Define the following terms.

(a) Limiting molar conductivity
(b) Fuel cell
(ii) How much electricity is required in coulomb for the oxidation if.
(i) I mole of H2O to O2
(ii) 1 mole of FeO to Fe2O3

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