Bihar Board (BSEB) 12th Chemistry Guess Question 2025
This sample paper (guess questions) have 70 objective questions, carrying 1 mark each and you have to answer any 35 questions. If you answer more than 35 questions, the first 35 questions will be check.
Objective Questions
Section: A
Question number 1 to 70 have four options, out of which only one is correct. You have to mark your selected option on the OMR sheet. Answer any 35 questions.
Bihar Board 12th Annual Exam 2025
75 V.V.I. Objective Questions
Your Test Result
You answered out of questions correctly.
You got % marks.
Subjective Questions
Section: B
Short Answer Type Questions
Question numbers 1 to 20 are short answer type. Answer any 10 questions. Each question carries 2 marks.
1. What is Frenkel defect. Explain with example.
2. What is Tyndal effect?
3. What is colligative property? Write the name of colligative properties.
4. Explain molar conductivity and specific conductivity.
5. Write the name and formula of at least two ores of copper.
6. State Henry's law and mention some important application?
7. What is Werner's theory.
8. Why transition elements shows variable oxidation numbers.
9. Differentiate DNA nad RNA.
10. Differentiate order of reaction and molecularity.
12. Write the IUPAC name of the following compounds
a. K3[Fe(CN)6]
b. Ti(H2O)6]+3
13. Why halogenes are colored?
14. What are monodentate ligands? Explain with examples.
15. Discuss the nature of C-X bond in haloalkane and haloarene.
16. Why phenol is more acidic than ethanol? 17. What is Aldol condensation?br> 18. Arrange the following bases in decreasing order in aqueous medium
C2H5-NH2, (C2H5)2NH and (C2H5)3N.
19. What is glycosidic linkage?
20. Explain thermoplastics and thermosetting polymers with two examples of each.
Long Answer Type Questions
Question number 21 to 26 are long answer type question. Answer any three questions. Each question carries 5 marks.
21. Write the principle of manufacturing of sulphuric acid by contact process and reaction with copper.
22. Distinguish between aldehydes and ketones.
23. Derive the expression for first order kinetics along with half life period.
24. Write short notes on the following.
a. HVZ reaction
b. Hoffmann Bromamide reaction
25. Write formula of the following as per IUPAC system.
a. Hexaamineplatinum (IV) chloride
b.Tetrabromidocuprate (II) ion
c. Sodium dicynidoaurate (I)
d. Potassium tetrahyrxozincate (II)
e. Potassium dicyanoargentate (I)
26. What happens when
a. Formic acid reacts with ammonical silver nitrate solution
b. Aniline reacts with chloroform in NaOH
