Chemistry · Class 12 Science

Chhattisgarh Cgbse Class 12 Chemistry — Real Previous-Year Papers

with complete answers

Real previous-year board papers, year by year — the official exam pattern, the full question paper, and every question solved the concept-first way. Distinct from the chapter-wise textbook bank.

2018–2026
Years of papers: 9
Total Papers: 9
Real Board Papers: 0
Sample papers: 248
Real-paper Q & A: 0
Sample-paper Q & A

Real board-paper questions available, by year

33 Q2026complete

26 Q2025complete

26 Q2024complete

26 Q2023complete

26 Q2022complete

26 Q2021complete

26 Q2020complete

26 Q2019complete

33 Q2018complete

CGBSE Intermediate Board 2026 · Set ANNUAL

Real board examination

This paper has 1 question on a topic removed in CBSE’s 2023-24 syllabus update (each marked Not in syllabus). It’s kept for historical accuracy — the exam really asked it that year — but isn’t in the current syllabus and doesn’t count toward a concept’s importance. Switch to to focus on what’s still examinable.

About this paper

The real Class-12 board examination held in 2026. Every question below is solved the concept-first way. Sample papers are labelled honestly — never shown as a past exam.

Total marks: 70
Questions: 20
Duration: 180 min
Sections: 6

The marks / questions / duration above are the official exam pattern. We currently have 33 of this paper’s questions (165% of the full paper), with 33 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

Section	Type	Questions	Marks each	Total
Q1-PartASection Q1-PartA	compulsory	1	1	1
Q1-PartBSection Q1-PartB	compulsory	1	1	1
Q2-8Section Q2-8	compulsory	7	2	14
Q9-14Section Q9-14	compulsory	6	3	18
Q15-16Section Q15-16	compulsory	2	4	8
Q17-19Section Q17-19	compulsory	3	5	15
Total		20		70

The question paper

The questions we hold for this paper, laid out by section. Solutions are on the Answers tab.

Board Examination

Chemistry

CGBSE Intermediate Board 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________

Time Allowed: 3 hoursMaximum Marks: 70

General Instructions

This question paper contains 20 questions divided into 6 sections — Q1-PartA, Q1-PartB, Q2-8, Q9-14, Q15-16, Q17-19.
Section Q1-PartA comprises 1 question of 1 mark each (compulsory).
Section Q1-PartB comprises 1 question of 1 mark each (compulsory).
Section Q2-8 comprises 7 questions of 2 marks each (compulsory).
Section Q9-14 comprises 6 questions of 3 marks each (compulsory).
Section Q15-16 comprises 2 questions of 4 marks each (compulsory).
Section Q17-19 comprises 3 questions of 5 marks each (compulsory).

Above is the official exam pattern. The questions printed below are those we currently hold for this paper.

Section A

Q1.

Which of the following is a colligative property?

(a) Osmotic pressure
(b) Vapour pressure
(c) Boiling point
(d) All of the above

[1]

Q2.

The unit of specific conductivity is:

(a) ohm⁻¹
(b) ohm⁻¹ cm⁻¹
(c) ohm cm
(d) ohm cm⁻¹

[1]

Q3.

The correct form of Arrhenius equation is:

(a) k = e^(-Ea/RT)
(b) k = Ea/RT
(c) k = log_e (Ea/R)
(d) k = A e^(-Ea/RT)

[1]

Q4.

Chromium belongs to which block?

(a) s-block
(b) p-block
(c) d-block
(d) f-block

[1]

Q5.

The oxidation number of nickel in [Ni(CO)4] will be:

(a) 1
(b) 0
(c) 2
(d) 3

[1]

Q6.

Ethylidine dichloride is a:

(a) vic-dihalide
(b) gem-dihalide
(c) allylic dihalide
(d) vinylic halide

[1]

Q7.

Which is used for poisoning the alcohol?

(a) Methyl alcohol
(b) Ethyl alcohol
(c) Glycerine
(d) Acetic acid

[1]

Page 1 of 5

Q8.

IUPAC name of CH3COOH is: (a) Ethanol (b) ethanoic acid (c) Ethanal (d) ethane

[1]

Q9.

Hinsberg reagent is: (a) C6H5SO2Cl (b) C6H5N2Cl (c) C6H5NO (d) C6H5SO3H

[1]

Q10.

Mohan cannot visualise properly in night. This disease is due to the lack of which vitamin? (a) Vitamin A (b) Vitamin C (c) Vitamin B (d) Vitamin D

[1]

Q11.

Give one example of zero-order reaction.

[1]

Q12.

Write the general electronic configuration of d-block elements.

[1]

Q13.

Give the structure of 2-chloro-3-methylpentane.

[1]

Q14.

Complete the following reaction: 3ROH + PCl3 → __ + __

[1]

Q15.

What is wood spirit?

[1]

Section B

Q1.

Write two differences between electromotive force and potential difference.

[2]

Q2.

Determine the order and rate of the following reaction: 2NH3(g) —[1130K, Pt]→ N2 + 3H2(g)

[2]

Page 2 of 5

Q3.

What is complex or coordination compound? Give one example.

[2]

Q4.

Why does phenol show acidic nature?

[2]

Q5.

What do you understand by the term 'hydrazine'?

⚠ This question is not in the current syllabus — This question tests hydrazine (a hydride of nitrogen), traditionally covered under "The p-Block Elements" (nitrogen fami

[2]

Q6.

Write the name and formula of the product formed in the following reaction: CH3C≡N —[H2/Ni]→ __ __ __

[2]

Q7.

Why is vitamin C not stored in our body?

[2]

Section C

Q1.

3.65 grams of HCl is dissolved in 500 grams of water. Determine the molality of the solution.

[3]

Q2.

Write any three differences between molecularity and order of reaction.

[3]

Page 3 of 5

Q3.

Explain the mechanism of SN1 (unimolecular nucleophilic substitution) reaction with example.

[3]

Q4.

Distinguish between Primary, Secondary and Tertiary alcohols on the basis of dehydrogenation method.

[3]

Q5.

How will you convert methylamine to ethylamine? Write equation.

[3]

Q6.

What are the different types of RNA found in a cell? Explain.

[3]

Section D

Q1.

Write any four differences between Positive and Negative deviation of non-ideal solutions. **OR** Write any four differences between Ideal solution and Non-ideal solution.

[4]

Q2.

Write the IUPAC names of the following compounds: (i) Na2[Pt(CN)4] (ii) [Mn(H2O)6]2+ (iii) [Ni(NH3)4]Cl2 (iv) [Cr(NH3)3Cl3] **OR** Write the structural formulas of the following compounds: (i) Potassium tetrahydroxido-zincate (II) (ii) Triammine trichloro-platinate (II) ion (iii) Triaquohydroxo-zinc (II) ion (iv) Tetrachloro-platinate (II) ion

[4]

Page 4 of 5

Section E

Q1.

[1+2+2=5] (i) Why do transition elements form alloys easily? [1] (ii) Explain the following: (A) Transition elements form interstitial compounds. Why? [2] (B) Transition elements act as good catalysts. Why? [2] **OR** (i) What is lanthanoid contraction? (ii) What are the causes and consequences of lanthanoid contraction?

[5]

Q2.

[2+3=5] Show the labelled diagrammatic presentation of electrochemical cell which has copper electrode having one molar copper sulphate and standard hydrogen electrode. Write the cell reaction and find the standard electromotive force for this cell when the value of standard reduction potential for copper electrode is +0.34 V. **OR** Show the labelled diagrammatic presentation of electrochemical cell which has iron electrode having one molar ferrous sulphate and standard hydrogen electrode. Write the cell reaction and find the standard electromotive force for this cell when the value of standard reduction potential for iron electrode is –0.44 V.

[5]

Q3.

[1+1+1+1+1=5] Write only the equations of the following reactions: (i) Cannizzaro reaction (ii) Hell-Volhard-Zelinsky (HVZ) reaction (iii) Iodoform reaction (iv) Acetylation (v) Aldol condensation **OR** What happens when (write only chemical equation)– (i) reaction of NaOH and I2 on acetone; (ii) reduction of acetaldehyde in the presence of amalgamated Zn and HCl; (iii) acetic acid reacts with PCl5; (iv) acetic acid reacts with NH3; (v) reduction of methyl cyanide in the presence of SnCl2 and HCl and then hydrolysed?

[5]

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