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Chemistry · Class 11 Science

Yanam Bieap Class 11 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
8
Total Papers
8
Real Board Papers
0
Sample papers
185
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

38 Q2026complete
21 Q2025complete
21 Q2024complete
21 Q2023complete
21 Q2022complete
—2021Not available
21 Q2020complete
21 Q2019complete
21 Q2018complete

BIEAP Intermediate Board (1st Year) 2026 · Set ANNUAL

Real board examination

This paper has 2 questions 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
—
Questions
—
Duration
—
Sections
—

The marks / questions / duration above are the official exam pattern. We currently have 38 of this paper’s questions, with 38 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

The question paper

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

Board Examination

Chemistry

BIEAP Intermediate Board (1st Year) 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________
Time Allowed: —Maximum Marks: —
Section A

Q1.
The drug Azidothymidine (AZT) is used in the treatment of :
  • (1) Cancer
  • (2) AIDS
  • (3) Bronchitis
  • (4) Ulcer
⚠ This question is not in the current syllabus — AZT / drug-disease matching belongs to 'Chemistry in Everyday Life', which is not among the 9 wired AP Class-11 Chemistr
[1]
Q2.
Which of the following is ionic ?
  • (1) KI
  • (2) CH4
  • (3) Diamond
  • (4) H2
[1]
Q3.
The oxidation number of Sulphur in Na2S4O6 is :
  • (1) 2.5
  • (2) 1.5
  • (3) 2
  • (4) 3
[1]
Q4.
Splitting of spectral lines in electric field is called ____________.
[1]
Q5.
For an isolated system, ΔU = 0, the value of ΔS will be ____________.
[1]
Q6.
Ethyl alcohol and methyl alcohol can be separated by ____________ method.
[1]
Q7.
What is diagonal relationship ?
[1]
Page 1 of 6
Q8.
What is the value of Kw at 25 C ?
[1]
Q9.
What is Lindlar's catalyst ?
[1]
Section B

Q1.
What is Aufbau principle ?
[2]
Q2.
What is a black body ?
[2]
Q3.
The empirical formula of a compound is CH2O. It's molecular mass is 90. Calculate the molecular formula of the compound.
[2]
Q4.
How many moles of glucose are present in 540 g of glucose ?
[2]
Q5.
Name any two bridge elements.
[2]
Q6.
State the third law of thermodynamics.
[2]
Page 2 of 6
Q7.
What is heterogeneous equilibrium ? Give two examples.
[2]
Q8.
Write the bond order and magnetic behaviour of H2.
[2]
Q9.
State Octet rule.
[2]
Q10.
What is Wurtz' reaction ? Give one example.
[2]
Q11.
What is Friedel-Crafts alkylation ?
[2]
Q12.
How many π and σ bonds are present in each of the following molecules ? (1) HC≡CCH=CHCH3 (2) CH2=C=CHCH3
[2]
Q13.
What is carbocation ? Give example.
[2]
Q14.
Write formulae for the following compounds. (a) Nickel(II) sulphate (b) Thallium(I) sulphate
[2]
Page 3 of 6
Section C

Q1.
Give any four characteristic properties of transition elements.
⚠ This question is not in the current syllabus — Transition-element (d-block) chemistry is a Class-12 topic and has no chapter in the 9 wired AP Class-11 Chemistry chapt
[4]
Q2.
A carbon compound contains 12.8% carbon, 2.1% hydrogen and 85.1% bromine. The molecular mass of the compound is 187.9 u. Calculate its molecular formula.
[4]
Q3.
Explain the difference between orbit and orbital.
[4]
Q4.
What are σ and π bonds ? Specify the differences between them.
[4]
Q5.
Explain the hybridisation involved in PCl5 molecule.
[4]
Q6.
State Le Chatelier's Principle. Discuss the application of Le Chatelier's principle for the industrial synthesis of Ammonia by Haber's process.
[4]
Page 4 of 6
Q7.
The species H2O, HCO3-, HSO4- and NH3 can act both as Bronsted acids and bases. Give the corresponding conjugate acid and base for each of them.
[4]
Q8.
What are open, closed and isolated systems ? Give one example for each.
[4]
Q9.
State and explain the Hess's law of constant Heat summation.
[4]
Q10.
Complete the following reaction and name the products A, B and C. CaC2 --(H2O)--> A --(Hot metal tube)--> B --(AlCl3 + CH3Cl)--> C
[4]
Q11.
Balance the following redox reactions by ion-electron method (in acidic medium) : Cr2O7²- (aq) + Fe²+ (aq) -> Cr³+ (aq) + Fe³+ (aq)
[4]
Q12.
What is position isomerism and functional isomerism ? Give one example for each.
[4]
Page 5 of 6
Section D

Q1.
What are quantum numbers ? Explain the significance of quantum numbers.
[8]
Q2.
Define IE1 and IE2. Why IE2 is always greater than IE1 for a given atom ? Discuss the factors that effect IE of an element.
[8]
Q3.
Describe two methods of preparation of Ethylene. How does it reacts with the following ? Give equations. (a) Ozone (b) Cold and dil. alk KMnO4 (c) Br2
[8]
Page 6 of 6