Bihar Board Class 12 Chemistry Answer Key 2026

Bihar Board Class 12 Chemistry Answer Key 2026: Bihar Board has conducted the Class 12 Chemistry exam. Students who have appeared for the Chemistry exam. They can have a look at the Bihar Board Class 12 Chemistry Answer Key 2026. It can help them gain insights into the answers to the questions asked in the Bihar Board 12th Chemistry Question Paper 2026, enhancing students' understanding. It is an unofficial answer key. 

Bihar Board Class 12 Chemistry Answer Key 2026 Overview

Chemistry exam is of 3 hours and 15 minutes duration, and includes a combination of objective and subjective questions. It is an offline-based board exam organised by the Bihar School Examination Board (BSEB). 

Bihar Board Class 12 Chemistry Answer Key 2026

Students can take a look at the Bihar Board Class 12 Chemistry Answer Key responses provided below. It can help them know the topics covered in the exam. 

• FCC Atoms: Number of atoms in Face-Centred Cubic is 4.

• Packing Fraction: For BCC, it is 0.68.

• Ferromagnetic: Iron (Fe).

• Frenkel Defect: Silver Chloride (AgCl).

• Abnormal Osmotic Pressure: Common Salt (NaCl) because it dissociates.

• Boiling Point Elevation: 1 molal solution is called Ebullioscopic.

• Vapour Pressure: The lowest vapour pressure is associated with the substance that has the most ions.

• Specific Conductance: Decreases on dilution; Molar conductivity increases.

• Secondary Cell: Lead storage battery (implied).

• Arrhenius Equation: Represents the effect of temperature on reaction rate.

• Order of Reaction: Basic hydrolysis of esters is 2nd order (Not 1st).

• Adsorption: Langmuir Adsorption Isotherm (Option B).

• Colloidal Size: 1nm to 1000nm (Note: transcript says 10nm, but standard is 1nm-1000nm).

• Smoke: Solid dispersed in Gas.

• Biocatalyst: Enzymes.

• Thermite Process: Aluminium is the reducing agent.

• P4O10: Used as a dehydrating agent.

• Nitric Acid: Manufactured via the Ostwald Process.

• Inert Gas Configuration: ns^2 np^6.

• Vitamin B12: Contains Cobalt.

• Ether Formula: C_n H_{2n+2} O.

Importance Of Bihar Board Class 12 Chemistry Answer Key

Candidates, after getting the Chemistry answer key responses, should carefully match them with the answers attempted in the exam. It helps the students to identify their mistakes in the exam and calculate their predicted scores. 

• Helps in Self-Evaluation: Students can compare their marked responses with the official answer key to estimate their performance.

• Predicts Expected Score: By matching answers, candidates can calculate their probable marks before the final result is declared.

• Reduces Exam Anxiety: Checking answers early gives clarity and reduces stress regarding result uncertainty.

• Ensures Transparency in Evaluation: The answer key maintains fairness and transparency in the examination process.

• Opportunity to Raise Objections: If any answer seems incorrect, students can challenge it within the given objection window.

• Improves Understanding of Mistakes: Students can identify weak areas and conceptual errors for future improvement (especially useful for competitive exams).