Quarterly Exam 2025 : Chemistry Class 12  Model / Practice Question Paper I As per Blue Print

Quarterly Exam 2025 : Class 12 Chemistry Question Paper Syllabus

1. Solution

2. Electrochemistry

3. Elements of d and f Block

4. Covalent Chemistry

5. Halo Alkenes and Halo Arenes

 Quarterly Exam 2025 : Class 12 Chemistry Question Paper 

  Pattern

Class 12 Chemistry will have objective type questions of 28 marks.

Objective type questions will be mainly asked in 5 types.

 1. Choose the correct option – 06 marks 

2. Write the answer in one word/sentence – 05 marks

3. Fill in the blanks – 06 marks

4. Match the correct pair – 06 marks

5. Write True / False - 05 marks

In this, 7 questions of 2 marks, 4 questions of 3 marks and 4 questions of 4 marks will also be asked.

Quarterly Exam 2025 : Class 12 Chemistry Question Paper Format

Class 12 Chemistry will have 28 marks objective type questions.

Objective type questions will be asked in Class 12 Chemistry.

Objective type questions will be asked in 5 main types.

1. Choose the correct option 06 marks

2. Write the answer in one word/sentence 05 marks

3. Fill in the blanks 06 marks

Match 4 correct pairs 06 marks

5. Write true/false 05 marks

In this, 7 questions of 2 marks, 4 of 3 marks and 4 of 4 marks will also be asked.

Quarterly Exam 2025 Model / Practice Question Paper CHEMISTRY

Subject: CHEMISTRY

Class: 12th

Time-3.00 Hours Total Marks-70

Instructions:- 1. It is compulsory to solve all the questions.

2. Question No. 06 to 20 have internal options.

3. Question No. 01 to 05 are objective type questions. Different marks are allotted for each question.

4. Marks for each question are indicated in front of them.

5. Answer each question from Question No. 06 to 12 in 30-40 words 2 Marks

6. Question No. Answer each question from 13 to 16 in about 75-80 words. 3 marks.

7. Answer questions no. 17 to 20 in about 80-100 words. 4 marks.

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

i. The law of solubility of gases in liquids was given by

(A) Henry (B) Van Hoff (C) Berkeley (D) Boyle

II. What is the number of grams of solute present in 1 millionth of solution called?

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

III. The inverse of resistivity (specific resistance) is called-

A. Molar conductivity B. Specific conductivity C. Molecular conductivity D. Conductivity

iv. All the elements of f block are called -

(A) Transition elements (B) Intra-transition elements (C) Parauronium (D) Inert gas elements

v. The number of paired electrons in Fe +++ ion will be -

(A) 0 (B) 4 (C) 5 (D) 3

vi. Primary valency is normally ionized and it is satisfied by which ion -

(A) Positive (B) Negative (C) Amphoteric (D) Neutral

vii. Chlorobenzene is used in the treatment of which disease -

(A) Malaria (B) Goiter (Ghangha)

(C) Typhoid (D) Anemia

Q.2. Fill in the blanks - 1×6 = 6

i  Two solutions having the same osmotic pressure are called --------------- solutions

ii. The formula for osmotic pressure is ------------.

iii. For the reduction of 1 mole Al+++ to Al, --- -------------- Faraday is required.

iv  The potential of standard hydrogen electrode or normal hydrogen electrode cell is -------

v.  The oxidation number of Mn in kMnO4 is ----------

vi. The product of Feidel Craft alkylation reaction is ----------?

Q.3. Match the correct pair 1×6 = 6

A B Phosgene Smoke Grignard reagent Soda water Pm 96500 coulomb One faraday Radioactive element Solution of gas in liquid R-Mg-X Solution of solid in gas Carbonyl chloride

Q.4. Write answer in one sentence. 1×5  =5

i. Write an example of ideal solution?

ii. Can copper sulphate solution be kept in zinc vessel?

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

iv. Write the correct formula of alum?

v. Draw the correct structure of 4 tertiary butyl-3 iodo heptane?

Q.5. Write true/false      1×5  =5

i. Iodoform is used as an antiseptic?

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

iii. Most of the transition metals are good catalysts because they contain paired electrons

iv. The half cell of galvanic cell in which oxidation takes place is called anode and its potential is negative with respect to the solution   ?

v. The number of moles of solute present in 1000 grams of solvent is called molarity?

Q.6   Write Henry’s law (2)

                 OR

Write the definition of reverse osmosis

Q. 7 Write Faraday's first law

                 or

What is called a strong electrolyte

Question 8. Write two uses of lanthanide elements

                    or

Write the electronic configuration of chromium and copper

Question 9. Write the formulae of the following coordination compounds 2

i. Tetra amine di aqua cobalt (iii) chloride (ii.) Potassium tetra cyanide nickelate (iii)

       or

What is called ligand ?

Question 10 Why is chloroform kept in coloured bottles ? 

     OR

Write the formulae of gem halide and vis di halide ? 2)

Question 11 Why is mercury in liquid state ? (2)

     OR

Transition elements show high values ​​of atomization enthalpy why?

Q.12   What is called a semi conductor?

     OR

Find the molality of the solution of 2.5 gm ethanoic acid in 75 gm benzene?

Q.13  Explain the following reactions (any three)? 3

i Burtz Fitting ii Sandmeyer iii Swarts iv Finkelstein v Burtz

      OR

What happens when (equations only) any three - ?

i Bromo benzene reacts with magnesium in the presence of dry ether

ii Methyl chloride reacts with KCN

iii Ethyl chloride reacts with aqueous KOH

iv n Butyl chloride reacts with alcohol alkali

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

i. Osmotic pressure ii. Abnormal molecular weight iii. Mole fraction

or

If 122 grams of CCl4 is dissolved in 22 grams of benzene, then find the mass percentage of benzene and CCl4

Q.15 Write three differences between d and f block? (3) 

or 

Cuprous ion is colourless, whereas cupric ion is coloured, why?

Q.16. Write three differences between double salt and complex salt. 3

or

Write definition and two uses of chelate 

Q.17. Write definition of molal boiling point elevation constant and its relation with mass of solute 4

 or

Write four differences between non-ideal solution showing positive and negative deviation.

Q.18. Write Kohlrausch law and its two applications (4)

                        or

Write definition, formula, unit of molar conductivity and specific conductivity and effect of dilution on them

Q19. Write definition of corrosion and its electrochemical principle and measures to prevent corrosion (4)

                      or 

Write definition of electrochemical cell and its pictorial description and cell reaction

Q20. Write definition, causes and results of lanthanide contraction

       or 

Give reasons -

i. Why are transition elements good catalysts? ii. Why do transition metals show variable valency?

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