Half Yearly Exam 2025 - Class 12th Chemistry Model / Practice Question Paper

 Half Yearly Exam 2025- Class 12th  Chemistry 

         Model / Practice  Question Paper

The Madhya Pradesh School Education Department's Class 12th half-yearly examinations will begin on November 3rd. The timetable has been released. The syllabus and blueprint for the half-yearly examination have also been released.

View the Class 12th Chemistry  syllabus.

Read and solve model/practice papers for the Class 12th Chemistry  half-yearly examination.

Half-Yearly Exam 2025: Class 12 Chemistry Question Paper Format

The Class 12 Chemistry question paper will consist of 28 objective-type questions.

Objective-type questions are typically asked in five main types:

1. Choose the correct option (6)

2. Write the answer in one word/sentence (5)

3. Fill in the blanks (6)

4. Match the correct pair (6)

5. True/False (6)

In addition, 7 questions worth 2 marks, 4 questions worth 3 marks, and 4 questions worth 4 marks will also be asked.

Half Yearly Exam 2025: Class 12 Chemistry Model Paper

Subject: Chemistry

Class: 12th

Time: 3.00 hours, Marks: 70

Instructions: 1. All questions are mandatory.

2. Questions 6 to 20 are internal choices.

3. Questions 1 to 5 are objective questions. Each question carries a different number of marks.

4. Marks are indicated against each question.

5. Answer questions 6 to 12 in 30-40 words each. 2 marks.

6. Question No. Answer questions 13 to 16 in approximately 75-80 words each (3 marks).

7. Answer questions 17 to 20 in approximately 80-100 words (4 marks).

Question 1. Write the correct option - 1 × 6 = 6

i. The unit of cell constant is

(A) ohm cm (B) cm^-1 (C) cm (D) ohm^-1 cm^-1

II. The number of grams of solute present in 1 millionth of a solution is called?

(a) M (b) m (c) ppm (d) mole fraction

III. The nature of the α-hydrogen in aldehydes is -

A. Acidic B. Basic C. Neutral D. Amphoteric

iv. The inner transition element is -

(A) Sc (B) V (C) Hg (D) Ce

v. The oxidation number of Fe in K2 [Fe(CN)6] is -

(a) 0 (b) 4 (c) 5 (d) 3

vi. The most acidic of the following is

(A) CF3COOH                (B) CCl3COOH

(C) CHCl2COOH             (D) CH3COOH

vii. Which protein transports O2 in the bloodstream?

(a) Myoglobin (b) Insulin

(c) Albumin (d) Hemoglobin

Q. 2. Fill in the blank - 1 × 6 = 6

i. Which acid is obtained from red ants?

ii. The formula for osmotic pressure is -

iii. Alcohol is obtained from destructive distillation of wood.

iv. The potential of a standard hydrogen electrode or normal hydrogen electrode cell is _______.

v. Vitamin A deficiency causes an eye disease called _______.

vi. The product of the Feidel-Crafts alkylation reaction is _______.

Question 3. Match the correct pair. 1 × 6 = 6.

   A                                               B

 Coin                                        metal 

Soda water                              EDTA

War gas                                    Pm 

96500 coulomb                        One faraday

 Radioactive element               Chloropicrin 

Polydentate gas                        Water in liquid

Question 4. Write the answer in one sentence. 1 × 5 = 5.

i. What type of bonds are formed by the primary valence of a burner?

ii. Which metal is used in the Burtz synthesis?

iii. Which is the last element in the 3d series?

iv. Write the correct formula for alum?

v. What is formed when alcohols are dehydrated?

Q. 5. Write true or false. 1 × 5 = 5

i. The molecularity of a reaction cannot be zero.

ii. Chlorophyll, hemoglobin, and vitamin B12 are coordination compounds containing Mg, Fe, and Co metals, respectively.

iii. Are the isomers of ether alcohols?

iv. The half-cell of a galvanic cell where oxidation occurs is called the anode and its potential is negative relative to the solution.

v. Are tissues made of proteins?

Question 6. Write two differences between the rate of reaction and the rate constant (2)

     or

What is specific conductivity?

Question 7. If 120 grams of NaOH is dissolved in 2 liters of bicarbonate, find the molarity of bicarbonate? (2)

        or

If 6 grams of urea is dissolved in 72 grams of water, find the mole fraction of urea?

Question 8. Write two differences between ideal and non-ideal solutions.

                 or

Write the electronic configuration of chromium and copper.

Question 9. Write the formulas of the following coordination compounds:

i. Hexaamine platinum (iv) chloride; ii. Hexaaqua chromium (iii) chloride (2)

                     or

What is a ligand? Give one example.

Question 10 What is Kohlrausch's law? Write one application of it. (2)

                    Or

What is instantaneous rate?

Question 11 What is formalin? Write its uses. (2)

         Or

Ketones are more active than aldehydes. Why?

Question 12 Write two differences between DNA and RNA. (2)

            Or

What is a peptide bond?

Question 13 Give reasons why an alkyl halide is insoluble in water even though the C-X bond is polar. (3)

                      Or

What happens when (write only the chemical equation)-

i. Chlorobenzene is heated with copper cyanide in the presence of pyridine.

ii. Chlorobenzene is heated with sodium in the presence of ether.

iii. Ethyl bromide is heated with alcoholic KOH.

Q. 14 Write the definition of the following: (3)

i. Osmotic pressure

ii. Abnormal molecular weight

iii. Mole fraction

            OR

If 122 grams of CCl4 are dissolved in 22 grams of benzene, find the mass percentage of benzene and CCl4.

Q. 15. Why are transition elements good catalysts? (3)

                   or

Write any three differences between lanthanides and actinides.

Question 16. Write any three differences between phenols and alcohols.

                 or

Definition of chelate and two uses.

Question 17. Explain the quick vinegar method for the preparation of acetic acid based on the following points: (4) i. Principle and equation ii. Labeled diagram

                  or

Explain the following reaction:

i. Cannizzaro reaction ii. Aldol condensation

Question 18. Describe the oxidation or dehydrogenation process to distinguish between primary, secondary, and tertiary alcohols, with equations. 4

          or

What is called lanthanide contraction? Write its cause and result.

Question 19. Explain the relationship between specific conductivity and cell constant. (4)

                   or

Prove that the half-life of a first-order reaction does not depend on the initial concentration of the reactant.

Question 20. Explain the following (give equations only): (4)

i. Sand-Meyer reaction

ii. Burtz-Fitting reaction

iii. Carbyl amine reaction

iv. Haloform reaction

                    or

Write the method and use of the following:

i. DDT

ii. BHC

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