ISC Specimen Papers Class 12 Academic Session: 2025-26
The Indian School Certificate (ISC) Board has recently released the sample papers along with answer key for the class 12th academic session 2025 - 2026 on its official website. Students can download pdf files of sample paper Chemistry, Physics, Mathematics, Biology, Biotechnology, Environmental Sciences, English Paper-1, English Paper-2, Elective English and Hindi from this page maxbrainchemistry.com. This sample papers provides complete structure of Exam paper and by solving and practicing these papers students can also check their preparation and can focus on topics that required improvement. These sample papers are designed by subject experts based on the latest ISC syllabus and guidelines.
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ISC Class 12th Specimen Papers 2025
| ISC Specimen Papers Class 12 Exam 2026 | |
| Subject | Download |
|---|---|
| Chemistry | Click Here |
| Physics | Click Here |
| Mathematics | Click Here |
| Biology | Click Here |
| Biotechnology | Click Here |
| English Paper-1 | Click Here |
| English Paper-2 | Click Here |
| English Elective | Click Here |
| Environmental Sciences | Click Here |
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Chemistry Section: A For Practice, Exam 2026
SECTION A – 14 MARKS
Choose the correct word(s) from those given in the brackets:
[exothermic, zero, three, diazonium chloride, Lucas reagent, phenolphthalein, increases, decreases, electrophilic, nucleophilic, cinnamic acid, aldol condensation]
(i) The addition of a non-volatile solute to a pure liquid solvent ___ the vapour pressure and ___ the boiling point of the solvent.
(ii) For a zero-order reaction, when initial concentration is doubled, the half-life is ___ affected.
(iii) An aromatic amine, on reaction with nitrous acid at 273–278 K, yields ___, which can undergo coupling with phenol.
(iv) Propanal in the presence of dilute NaOH undergoes ___ reaction to form β-hydroxy aldehydes.
Choose the most appropriate option in each case:
(i) The sum of coordination number and oxidation number of metal ‘M’ in [M(NH3)4Cl2]Br2 is:
(a) 6
(b) 7
(c) 8
(d) 9
(ii) The correct order of ligand field strength in the spectrochemical series is:
(P) Cl⁻ < NH₃ < CN⁻ < CO
(Q) NH₃ < H₂O < CN⁻ < CO
(R) I⁻ < Br⁻ < Cl⁻ < F⁻
(S) H₂O < en < NO₂⁻ < CO
(a) Only (P) & (S) are correct
(b) Only (Q) & (S) are correct
(c) Only (P) & (Q) are correct
(d) Only (R) & (S) are correct)
(iii) When bromobenzene is heated with metallic sodium in dry ether, the product formed is:
(a) biphenyl
(b) bromobenzene
(c) benzyl bromide
(d) toluene
(iv) Hydrolysis of maltose gives:
(a) glucose only
(b) glucose and fructose
(c) two glucose units
(d) lactose and galactose
(v) Acetone reacts with phenylhydrazine to form:
(a) an oxime
(b) a hydrazone
(c) a semicarbazone
(d) an acetal
(vi) Assertion: 0.1 M glucose solution and 0.1 M sodium chloride solution have the same freezing point depression.
Reason: Freezing point depression is a colligative property depending only on molar concentration.
(a) Both Assertion and Reason are true, and Reason is the correct explanation
(b) Both Assertion and Reason are true, but Reason is not correct explanation
(c) Assertion true, Reason false
(d) Both false
(vii) Assertion: Tertiary alcohols react immediately with Lucas reagent to give turbidity.
Reason: Tertiary alcohols undergo the SN1 reaction mechanism forming stable carbocations.
(a) Both Assertion and Reason are true, and Reason is the correct explanation
(b) Both Assertion and Reason are true, but Reason is not correct explanation
(c) Assertion true, Reason false
(d) Both false
Ravi studied the variation of conductivity and molar conductivity of aqueous NaNO₃ at 298 K by diluting the solution. He recorded the following data:
Conc. (M) κ (S cm⁻¹) Λm (S cm² mol⁻¹)
1.00 1.15 × 10⁻¹ 115.0
0.10 1.25 × 10⁻² 125.0
0.01 1.35 × 10⁻³ 135.0
Answer the following:
(i) Why does molar conductivity increase with dilution though conductivity decreases?
(ii) If Λ°m for NaNO₃ is 145.0 S cm² mol⁻¹, calculate the degree of dissociation at 0.01 M.
(iii) If the conductivity of 0.02 M KOH is 5.60 × 10⁻³ S cm⁻¹, calculate its molar conductivity.
(A) Fill in the blanks
(i) decreases, increases
(ii) not / zero
(iii) diazonium chloride
(iv) aldol condensation
(B) MCQs
(i) (c) 8
(ii) (a) Only (P) & (S) are correct
(iii) (a) biphenyl
(iv) (c) two glucose units
(v) (b) hydrazone
(vi) (b) Both Assertion and Reason are true, but Reason is not correct explanation
(vii) (a) Both Assertion and Reason are true, and Reason is the correct explanation
(C) Comprehension-based
(i) Conductivity depends on the number of ions per unit volume; on dilution, concentration and hence conductivity decrease, but molar conductivity increases because volume per mole increases, giving ions more mobility.
(ii) α = Λm / Λ°m = 135.0 / 145.0 = 0.931 ⇒ 93.1% dissociation.
(iii) Λm = (κ × 1000) / M = (5.60 × 10⁻³ × 1000) / 0.02 = 280 S cm² mol⁻¹.