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Bihar Board Class 12 Chemistry Important Questions 2026 are from Solid State, Solutions, Electrochemistry, Chemical Kinetics, p-block Elements, d and f-block elements, Biomolecules, and so on. As per the latest
Bihar Board Class 12 Chemistry Exam Pattern 2026
, the exam will be conducted with 50% objective (multiple-choice) and 50% subjective questions. There will be two sections in the BSEB 12th Chemistry question paper where In Section A, there will be 70 objective-type questions, out of which any 35 questions are to be answered. Each question will carry 1 mark. In Section B, there will be 20 Short Answer Type Questions, where each question will be worth 2 marks, out of which any 10 questions are to be answered. Apart from these, there will be 06 Long Answer Type Questions, each carrying 5 marks, out of which any 3 questions are to be answered. The theory portion will be held for 70 marks, with 30 marks allocated to practicals. Continue reading the article to have more ideas on Bihar Board Class 12 Chemistry Important Questions 2026.
Also Check
Bihar Board Class 12 Chemistry Syllabus 2025-26
Bihar Board Class 12 Chemistry Important Questions 2026 of 1 Mark
The 1-mark questions will be in Section A, where you need to attempt only 35 questions out of 70 objective-type questions. If more than 35 questions are answered, then only the first 35 answers will be evaluated. For answering the questions in section A, you will be given an OMR Answer Sheet. Here you will have to darken the circle with a blue/black ballpoint pen against the correct option on the OMR Answer Sheet. Do not use whitener/liquid/blade/nail, etc., on the OMR Answer Sheet; otherwise, your answer will be considered invalid. Based on the last few years questions, we have provided some important questions that are important for the Bihar Board Class 12 Chemistry exam in 2026:
-
On electrolysis of aqueous solution of NaF, the products obtained at cathode and anode are
- (a) F 2 , Na
(b) F 2 , H 2
(c) O 2 , Na
(d) O 2 , H 2 -
The Van Hoff factor of
0.1 M Ba(NO 3 ) 2 solution is 2.74. The dissociation level is
(a) 91.3%
(b) 87%
(c) 100%
(d) 74% -
Which of the following has the most stable +2 oxidation state?
(a) Sn
(b) Ag
(c) Fe
(d) Pb -
Which alkyl halide occurs only by SN 2
reaction? (a) CH 3 CH 2 X
(b) (CH 3 ) 2 CHX
(c) (CH 3 ) 3 C – X
(d) C 6 H 5 CH 2 X -
96500 Coulombs releases electricity from a solution of CuSO 4
. (a) 63.5 g of copper
(b) 31.76 g of copper
(c) 96500 g of copper
(d) 100 g of copper. -
Natural rubber is a polymer of:
(a) Butadiene
(b) Ethylene
(c) Styrene
(d) Isoprene -
In the colloidal state the particle size is :
(a) below 1 nm
(b) between 1 nm to 100 nm
(c) more than 100 nm
(d) none of the above -
The rate constant of a reaction increases with increase of temperature because :
(a) the activation energy increases
(b) the number of activated molecules decreases
(c) the activation energy decreases
(d) the number of activated molecules increases -
Number of σ and π Bonds in C
2
Molecule is/are :
(a) 1σ and 1π
(b) 1σ and 2π
(c) 2π only
(d) 1σ and 3π -
R-OH + CH
2
N
2
→ Leaving group in this reaction is :
(a) CH 3
(b) R
(c) N 2
(d) CH 2
Bihar Board Class 12 Chemistry Important Questions 2026 of 2 Marks
The 2-mark questions will be provided in Section B, where there will be 20 short-answer-type questions, out of which you need to attempt any 10 questions. Some of the important 2-mark questions that can come in the upcoming BSEB 12th Chemistry exam 2026 are listed below:
- What is Hybridisation of Carbon in CH 4 .
- What is the oxidation Number of Phosphorous in H 3 PO 3 .
- What is Geometrical shape of sp 3 ./ d 2 sp 3 ./ NH 3 .
- What is structure of Ozone molecule.
-
What is Packing efficiency in follow in unit cell.
(a) Simple cubic unit cell
(b) Body-centred cubic unit cell
(c) Hexagonal close Packed Lattices - What is vant Hoff factor.
- Define Henry’s Law.
- Why are lyophilic solutions more stable than lyophobic solutions?
- Explain why Aldehydes are more reactive than ketones.
- Explain the terms polymer and monomer.
Bihar Board Class 12 Chemistry Important Questions 2026 of 5 Marks
Apart from the 2 marks short answer type questions, there will be 6 long answer type questions in Section B. Each of the questions will carry 5 marks and out of 6 questions, you will have to answer any 3 questions. Some of the important 5 Marks questions are as follows:
- What are the methods available to measure concentration of solution discuss them in brief?
- Discuss the general Characteristics of group 15 elements.
-
[NiCl
4
]
2-
is paramagnetic while [Ni(Co
4
)] is diamagnetic Though both are tetrahedral. Explain.
(A) What do you mean by electrolysis? What are electrolytes and non-electrolytes? Give examples of each. What do you understand by weak and strong electrolytes? Give examples of each of them.
(B) State and explain Faraday’s law of electrolysis. How would you determine the equivalent of a element with its help?
(C) What do you mean by Electrochemical equivalent? Establish the relation between electrochemical equivalent and chemical equivalent of an element. -
State Kohlraush’s law.
(A) What are ethers? How can you prepare ether from (1) Alkykalide and (2) alcohol.
(B) Discuss the reaction of ether with (1) Hydrogen iodide (2) PCl 5 and (3) Acetyl chloride. - Give the general methods of the preparation of aldehydes and ketone and describe the general properties of these two groups of compounds.
- What do you mean by abnormal molecular weight? Explain the season of this abnormality. Calculate the degree of dissociation of a substance with the help of abnormal molecular weight.
Which Chapters have more Weightage in Bihar Board Class 12 Chemistry?
In the Bihar Board Class 12 Chemistry syllabus 2025-26, the chapters that will have the highest weightage are p-block Elements which will carry 8 marks. The second highest weightage-carrying unit is Aldehydes, Ketones, and Carboxylic Acids with 6 marks. Apart from these, the other important units are Electrochemistry, Chemical Kinetics, d and f block elements, Aldehydes, Ketones, Carboxylic Acids, and Biomolecules. Physical Chemistry topics like Solutions, Electrochemistry, and Chemical Kinetics are also important. All the above-mentioned chapters will carry 8 marks in the exam. You can focus on these topics, as these are the important sections for the academic year 2025-26. There are high chances that questions may come from these above-mentioned topics.
Based on the questions and the important units/topics that are mentioned in this article, you can start your preparation for the upcoming exam. Try not to do suggestive study; complete the entire syllabus and then solve the Bihar Board Class 12 Chemistry previous year question papers.
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