If you are a Bihar Board Class 12th Chemistry student preparing for the 2024 exam, this blog will be very useful for you. In this post, you are provided with BSEB 12th Chemistry 2024 Last Year Questions (Part 1) with Solutions, which will further strengthen your preparation.
BSEB 12th Chemistry 2024 Last Year Questions
1. The oxidation state of Ni in Ni(CO)₄
(A) 0
(B) 1
(C) 2
(D) 4
Answer: 0
2. Which of the following has the highest molar electrical conductance in aqueous solution?
(A) [Pt(NH₃)₆]Cl₄
(B) [Pt(NH₃)₅Cl]Cl3
(C) [Pt(NH₃)₄Cl₂]Cl₂
(D) [Pt(NH₃)₃Cl₃]Cl
Answer:—[Pt(NH₃)₆]Cl₄
3. The IUPAC name of K₃[Fe(CN)₆] is
(A) Potassium ferrocyanide
(B) Potassium ferricyanide
(C) Potassium hexacyanoferrate (II)
(D) Potassium hexacyanoferrate(III)
Answer:- Potassium hexacyanoferrate(III)
4. Vitamin B12 contains
(A) Cobalt
(B) Magnesium
(C) Iron
(D) Nickel
Answer: Cobalt
5. The coordination number of Ni in [Ni(C₂O₄)₃] is
(A) 3
(B) 6
(C) 4
(D) 5
Answer: 6
6. The IUPAC name of CH₃-CH(CH₃)-CH₂-CH₂Cl -CH2Cl is
(A) 1-chloro-2-methyl butane
(B) 1-chloroisopentane
(C) 1-chloro-3-methyl butane
(D) None of these
Answer: 1-chloro-3-methyl butane
7. C₂HBr + NaOH → C₂H₅OH + NaBr is an example of which of the following types of reaction?
(A) Electrophilic substitution
(B) Nucleophilic substitution
(C) Both (A) and (B)
(D) None of these
Answer: Nucleophilic substitution
8. Which of the following alkyl halides is hydrolyzed by the S1 mechanism?
(A) (CH₃)₂CHX
(B) CH₃CH₂X
(C) CH₃CH₂CH₂X
(D) (CH₃)₃CX
Answer: (CH₃)₃CX
9. Chloroform, on reduction with Zn and water, gives
(A) Acetylene
(B) Ethylene
(C) Ethane
(D) Methane
Answer: methane
10. When ethyl bromide is treated with dry silver oxide, we get
(A) Diethyl ether
(B) Ethylene
(C) Ethane
(D) Ethane
Answer: diethyl ether
11. Lucas’ reagent is
(A) Anhydrous CaCl₂ and conc. HCl
(B) Anhydrous ZnCl₂ and conc. HCl
(C) Anhydrous AlCl₂ and conc. HCl
(D) Anhydrous PdCl₂ and conc. HCl
Answer: Anhydrous ZnCl₂ and conc. HCl
12. Butan-2-ol is a
(A) Primary alcohol
(B) Secondary alcohol
(C) Tertiary alcohol
(D) Dihydric alcohol
Answer: secondary alcohol
13. Which of the following is a tertiary alcohol?
C*H_{3}
(A) C*H_{3}*C*H_{2}*OH
(B) C*H_{3} -C-ОН
C*H_{2}*C*H_{3}
C*H_{3}
(C) | C*H_{2}*OH C*H_{2}*OH
(D) C*H_{3} -C-CH2OH
C*H_{2}*C*H_{3}
C*H_{3}
Answer:-C*H_{3} -C-ОН
C*H_{2}*C*H_{3}
C*H_{3}
14. The IUPAC name of C*H_{3} – CH – C*H_{2}*OH is
(A) 2-methyl-1-propanal
(B) Isobutyl alcohol
(C) 2-methyl-1-butanal
(D) None of these
Answer: isobutyl alcohol
15. Alkyl halides form ethers by reacting with which of the following?
(A) Dry A*g_{2}*O
(B) Moist A*g_{2}*O
(C) Drt ZnO
(D) Moist ZnO
Answer:-Dry A*g_{2}*O
16. The IUPAC name of C*H_{3}-CH-C*H_{2}-CHO
(A) 2-Hydroxybutanal
(B) 3-Hydroxybutanal
(C) 2-Hydroxypropanal
(D) None of these
Answer: 3-Hydroxybutanal
17. Formalin is the commercial name of
(A) Formic acid
(B) Fluoroform
(C) 40% aqueous solution of methanal
(D) Paraformaldehyde
Answer: 40% aqueous solution of methanal
18. An aldehyde on oxidation gives
(A) an alcohol
(B) a ketone
(C) an ether
(D) an acid
Answer: an acid
19. Chloretone is formed when chloroform reacts with
(A) Formaldehyde
(B) Acetaldehyde
(C) Acetone
(D) Benzaldehyde
Answer: acetone
20. The general molecular formula of saturated monocarboxylic acids is
(A) CnH2n+20
(B) C₂H₂O
(C) CnH2nO2
(D) CnH2n+102
Answer: CnH2nO2
21. By which of the following can formic acid and formaldehyde be distinguished?
(A) Benedict solution
(B) Fehling solution
(C) Tollen’s reagent
(D) Sodium bicarbonate
Answer: sodium bicarbonate
22. Which of the following is not a first-order reaction?
(A) CH₃COOCH₃ + H₂O → CH₃COOH + CH₃OH
(B) CH3COOC2H5 + NaOH → CH3COONa + C2H5OH
(C) 2H₂O₂ → 2H₂O + O₂
(D) 2N2054NO₂ + O₂
Answer: CH₃COOC₂H₅ + NaOH → CH₃COONa + C₂H₅OH
23. The unit of rate constant of a second-order reaction is
(A) mol L⁻¹ sec⁻¹
(B) mol⁻¹ L⁻¹ sec⁻¹
(C) mol⁻¹ L sec⁻¹
(D) mol L sec¹
Answer: mol⁻¹ L sec⁻¹
24. If the rate equation for a reaction is dx/dt = k[H]¹/²[H]¹/², the order of reaction is
(A) 2
(B) 1
(C) 3 32
(D) 1
Answer: 1
We have completed BSEB 12th Chemistry 2024 Last Year Questions
Disclaimer: The questions and answers used in this post are taken from the book “Golden Publication”. We give credit to Golden Publication for this, and this blog has been created for educational purposes only