HSC Science (General)
HSC Science (Electronics)
HSC Science (Computer Science)
Academic Year: 2025-2026
Date & Time: 18th February 2026, 11:00 am
Duration: 3h
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General Instructions:
The question paper is divided into four sections.
- Section A: Q. No. 1 contains Ten multiple choice type of questions carrying One mark each. Q. No. 2 contains Eight very short answer type of questions carrying One mark each.
- Section B: Q. No. 3 to Q. No. 14 are Twelve short answer type of questions carrying Two marks each, (Attempt any Eight)
- Section C: Q. No. 15 to Q. No. 26 are Twelve short answer type of questions carrying Three marks each, (Attempt any Eight)
- Section D: Q. No. 27 to Q. No. 31 are Five long answer type of questions carrying Four marks each, (Attempt any Three)
- Use of log table is allowed. Use of calculator is not allowed.
- Figures to the right indicate full marks.
- For multiple choice type questions, only the first attempt will be considered for evaluation.
- Physical constants:
- Avogadro Number = NA = 6.022 × 1023
- Gas constant = R = 0.08206 L . atm. K−1 . mol−1
- 1 Faraday = F = 96500 Coulomb
The electrolyte used in H2 - O2 fuel cell is ______.
aqueous KCl
aqueous KOH
aqueous HCl
aqueous KNO3
Chapter:
The oxidation state of bromine in HOBrO2 oxoacid is ______.
+7
+5
+3
+1
Chapter:
Acetonitrile may be prepared by heating the following reactants:
Ethyl chloride with alcoholic KCN.
Ethyl chloride with alcoholic AgCN.
Methyl chloride with alcoholic KCN.
Methyl chloride with alcoholic AgCN.
Chapter:
The carbonated water is an example of ______.
solid in liquid solution.
liquid in liquid solution.
gas in liquid solution.
liquid in gas solution.
Chapter:
The unit of rate constant is per second, the order of reaction is ______.
Zero
First
Second
Third
Chapter:
A system releases 10 kJ of heat and performs 15 kJ of work on the surrounding. Hence the change in internal energy is ______.
+5 kJ
−5 kJ
+25 kJ
−25 kJ
Chapter:
The co-ordination complex ions [Co(NH3)5 (NO2)2⊕ and [Co(NH3)5 (ONO)2⊕ are ______ of each other.
ionization isomers
solvate isomers
linkage isomers
co-ordination isomers
Chapter:
The correct order for basic strength of amines and ammonia is ______.
NH3 > R - NH2 > R2NH > R3N
NH3 > R3N > R2NH > R - NH2
NH3 < R - NH2 > R3N > R2NH
NH3 < R - NH2 < R2NH > R3N
Chapter:
Amongst the following 3d-series elements, having highest value of first ionization enthalpy is:
Zn
Cu
Co
Sc
Chapter:
The pOH of 0.01 M HCl solution is ______.
1
2
11
12
Chapter:
Write the name of product obtained, when selenium is treated with magnesium metal.
Chapter:
Name the radioactive element in lanthanoids.
Chapter: [8] Transition and Inner Transition Elements
Cu crystallizes in fcc unit cell with edge length of 495 pm. What is the radius of Cu atom?
Chapter: [1] Solid State
Write the name of nanoparticle which acts as highly effective bacterial disinfectant.
Chapter:
Define unit cell.
Chapter: [1] Solid State [1] Solid State
Explain the trend in the following property of group 17 elements:
Atomic radii
Chapter:
Explain the trend in the following property of group 17 elements:
Electronegativity
Chapter:
Explain the following, giving two examples:
Homoleptic
Chapter: [9] Coordination Compounds
Explain the following, giving two examples:
Heteroleptic
Chapter: [9] Coordination Compounds
Write the chemical equation for the reaction of glucose with bromine water.
Chapter:
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Define Enantiomers.
Chapter: [10.01] Haloalkanes [10.02] Haloarenes
Write example of one dimensional nanostructure of size less than 100 nm.
Chapter:
Write the hydrolysis reaction of ethyl methyl ether.
Chapter:
Calculate the osmotic pressure of solution containing 0.822 gm of sucrose in 300 mL of water at 298 K.
[Given: Molar mass of sucrose 342 g/mol, R = 0.08205 dm3. atm. K−1. mol−1]
Chapter:
Write the mathematical equation of the first law of thermodynamics for an isochoric process.
Chapter: [3] Chemical Thermodynamics and Energetic [4] Chemical Thermodynamics
Write the mathematical equation for the first law of thermodynamics for adiabatic process.
Chapter:
Discuss the main points of similarity between lanthanoids and actinoids.
Chapter:
Distinguish between lanthanoid and actinoids.
Chapter: [8] Transition and Inner Transition Elements [8.02] F-block Elements
What is the action of the following reagent on chlorobenzene?
Conc. HNO3
Chapter:
Write the product formed by Chlorobenzene treated with a fuming H2SO4 reaction.
Chapter: [10] Halogen Derivatives
Explain the following reaction:
Cannizzaro reaction
Chapter: [12.01] Aldehydes and Ketones
A chemical reaction occurs in two steps:
\[\ce{NO2Cl_{(g)} ->[slow] NO2_{(g)} + Cl_{(g)}}\]
\[\ce{NO2Cl_{(g)} + Cl_{(g)} ->[fast] NO2_{(g)} + Cl2_{(g)}}\]
- Write down the rate law.
- Identify the reaction intermediate.
Chapter:
The standard potential of electrode Cu++(0.02 M) | Cu(s) is 0.337 volt. Calculate its potential in volt.
Chapter:
Derive the relationship between relative lowering of vapour pressure and molar mass of nonvolatile solute.
Chapter: [2] Solutions and Colligative Properties
State the two forms of the second law of thermodynamics.
Chapter:
Write reactions to bring about the following conversions.
Acetamide to Ethylamine
Chapter: [13] Amines [13.01] Amines
Explain the amphoteric nature of water.
Chapter: [3] Ionic Equilibria
Convert the following:
Ethanol into sodium ethoxide.
Chapter:
Convert the following:
Phenol into o-phenol sulfonic acid.
Chapter:
How will you carry out the following conversion?
Bromoethane to methoxyethane
Chapter:
Write any two characteristics of interhalogen compounds.
Chapter: [7] Elements of Groups 16, 17 and 18
Write the observed electronic configuration of chromium (Z = 24).
Chapter:
Calculate magnetic moment of Ti3+ by using spin only formula. (Z of Ti = 22)
Chapter:
Define Green chemistry.
Chapter: [16] Green Chemistry and Nanochemistry
Write examples of coordination metal complexes in biology.
Chapter:
Calculate the work done in oxidation of 2 moles of SO2 at 298 K, if \[\ce{SO2_{(g)} + \frac{1}{2}O2_{(g)} -> SO3_{(g)}}\]
[Given: R = 8.314 J/K/mol]
Chapter:
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Write the formula to measure % atom economy according to green chemistry.
Chapter:
Write reactions for the following conversions.
Benzene to Benzaldehyde
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones
Convert the following:
Cyclohexene into adipic acid.
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Write the reaction for the preparation of Nylon-6.
Chapter: [15] Polymers
The salt of Sc3+ ion is colourless and the salt of Mn3+ ion is coloured. Explain.
[Z of Sc = 21and Z of Mn = 25]
Chapter:
Write postulates of Werner theory of co-ordination complexes.
Chapter: [9] Coordination Compounds
What is the action of ethane –1, 2–diol on acetone?
Chapter:
Draw the zwitter ion structure for sulphanilic acid.
Chapter:
What is the action of benzene diazonium chloride on phenol in alkaline medium?
Chapter: [13.03] Diazonium Salts
How is glucose prepared from starch?
Chapter: [14.01] Carbohydrates
Draw the structure of 2, 4 - dinitrophenylhydrazone of acetaldehyde.
Chapter:
The rate of A + B → P is 3.6 × 10−2 mol/dm3/s. When [A] = 0.2 M and [B] = 0.1 M. Calculate the rate constant if reaction is first order in B and second order in A.
Chapter:
Define isotonic solutions.
Chapter: [2] Solutions [2] Solutions and Colligative Properties
Define molecularity of reaction.
Chapter: [6] Chemical Kinetics
State and explain Hess’s law of constant heat summation.
Chapter: [3] Chemical Thermodynamics and Energetic
Define the following term:
Ferromagnetism
Chapter: [1] Solid State
Write the name of catalyst used in preparation of HDP.
Chapter:
Draw structure of isoprene unit of natural rubber.
Chapter:
Calculate effective atomic number of Fe2⊕ in \[\ce{[Fe(CN)6]^{4\ominus}}\]
[Given: (Z = 26)]
Chapter:
Draw a neat labelled diagram of a lead accumulator.
Chapter: [5] Electrochemistry
Write two advantages of hydrogen-oxygen fuel cell.
Chapter:
Explain the mechanism of alkaline hydrolysis of bromomethane.
Chapter:
Answer the following in brief:
Acetic acid is 5% ionised in its decimolar solution. Calculate the dissociation constant of acid.
Chapter:
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