HSC Science (General)
HSC Science (Electronics)
HSC Science (Computer Science)
Academic Year: 2024-2025
Date & Time: 1st July 2025, 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. Only the first attempt will be considered for evaluation.
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-I questions carrying Two marks each. (Attempt any Eight)
- Section C: Q. No. 15 to Q. No. 26 are Twelve short answer type-II 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.
- Given data:
- R = 8.314 J K−1 mol−1
- At. Wt. of Oxygen = 16
- NA = 6.022 × 1023
- 1 F = 96500°C
The coordination number of atoms in bcc crystal lattice is ______.
2
4
6
8
Chapter: [1] Solid State
The unit of Henry’s Law constant is ______.
mol L−1 bar−1
mol−1 L bar−1
mol L−1 bar
mol−1 L−1 bar−1
Chapter:
Ideal gas expands isothermally from 20 dm3 to 25 dm3 at constant pressure of 1.5 bar; then work done in dm3 bar will be ______.
−1.5
−5
−7.00
−7.5
Chapter:
Correct statement about electrolysis of aqueous NaCl is ______.
H2 gas liberated at cathode.
Cl2 gas liberated at cathode.
H2 gas liberated at anode.
O2 gas liberated at anode.
Chapter:
Rate constant of reaction is mole dm−3 sec−1, the order of reaction will be ______.
Zero
one
1.5
2
Chapter:
The correct possible general formula for interhalogen compound in the following is:
`XX_2^'`
`XX_3^'`
`XX_4^'`
`XX_6^'`
Chapter:
All radioactive elements are present in which of the following:
3d series
4d series
Actinoid series
Lanthanoid series
Chapter:
The metal used in preparation of Grignard reagent is ______.
Al
Mg
Na
Fe
Chapter:
Which among the following is dicarboxylic acid?
Acetic acid
Phthalic acid
Caproic acid
Citric acid
Chapter:
Write the formula to calculate the % atom economy.
Chapter: [16] Green Chemistry and Nanochemistry
Write the structure and name of the monomer of Nylon-6.
Chapter: [15] Introduction to Polymer Chemistry [15] Polymers
Write the total number of chiral carbon atoms present in glucose.
Chapter:
Complete the following reaction:
\[\begin{array}{cc}
\ce{O}\phantom{......................................................}\\
||\phantom{......................................................}\\
\ce{CH3 - C - NH2 + 4(H) ->[Na/C2H5OH][LiAlH4, ether(H3O)^\oplus] ? + H2O}\
\end{array}\]
Chapter:
Write the name of the reagent used to convert phenol to Benzene.
Chapter:
Write oxidation state of ‘Fe’ in \[\ce{[Fe(CN)6]^{4\ominus}}\] complex ion.
Chapter:
Write 6.0 g of O2 reacts with ClF as per
\[\ce{2ClF_{(g)} + O2_{(g)} -> Cl2O_{(g)} + OF2_{(g)}}\]
The enthalpy change is 38.55 kJ. Calculate the standard enthalpy of the reaction.
Chapter:
When gold crystallizes, it forms face-centered cubic cells. The unit cell edge length is 4 × 10−8 cm. Calculate the density of gold. Molar mass of gold is 197 g mol−1.
Chapter:
Define isotonic solutions.
Chapter: [2] Solutions [2] Solutions and Colligative Properties
Define the following term:
Colligative properties
Chapter: [2] Solutions and Colligative Properties
A solution has hydrogen ion concentration 0.01 M. Calculate pOH of the same solution.
Chapter:
Obtain the relationship between ΔH and ΔU for gas phase reactions.
Chapter: [4] Chemical Thermodynamics
What is a salt bridge?
Chapter: [4] Electrochemistry [5] Electrochemistry
What are the functions of a salt bridge in a galvanic cell?
Chapter: [4] Electrochemistry [5] Electrochemistry
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Distinguish between Order and Molecularity of reaction.
Chapter:
Explain the anomalous behaviour of Fluorine with respect to oxyacid.
Chapter:
Explain the anomalous behaviour of Fluorine with respect to nature of hydrides.
Chapter:
Explain the anomalous behaviour of Fluorine with respect to electronegativity.
Chapter:
Explain the anomalous behaviour of Fluorine with respect to electron gain enthalpy.
Chapter:
Balance the following chemical reaction.
\[\ce{K2Cr2O7 + KI + H2SO4 -> K2SO4 + Cr2(SO4)3 + H2O + I2}\]
Chapter:
Balance the following chemical reaction.
\[\ce{K2Cr2O7 + H2SO4 + H2S -> K2SO4 + Cr2(SO4)3 + H2O + 3S}\]
Chapter:
Name the following complex ion in the IUPAC system:
[Cu(NH3)4]2+
Chapter:
Complete the following reaction:
\[\ce{CH3 - CH = CH2 + HBr ->}\] ?
Chapter:
Complete the following reaction:
\[\ce{C2H5OH + SOCl2 ->[\Delta]}\] ?
Chapter:
A mixture of benzene and toluene contains 30% by mass of toluene. At 30°C, vapour pressure of pure toluene is 36.7 mm Hg and that of pure benzene is 118.2 mm Hg. Assuming that the two liquids form ideal solutions, calculate the total pressure and partial pressure of each constituent above the solution at 30°C.
Chapter: [2] Solutions
Calculate maximum work done when 32 g of oxygen expanded isothermally and reversibly from pressure 2 bar to 1 bar at 298 K.
Chapter:
What is zero order reaction?
Chapter: [6] Chemical Kinetics
Derive integrated rate law for zero order reaction.
Chapter: [6] Chemical Kinetics
Draw the structure of chlorous acid.
Chapter: [7] Elements of Groups 16, 17 and 18
What is Lanthanoid contraction?
Chapter: [8.02] F-block Elements
Compounds of ‘d’ block elements are coloured in solid state as well as in an aqueous state. Explain.
Chapter:
Write the representation of sodium hexacyanoferrate (III).
Chapter:
Write type of hybridization and magnetic behavior of the following:
[Co(NH3)6]3⊕
Chapter:
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Write type of hybridization and magnetic behavior of the following:
\[\ce{[NiCl4]^{2\ominus}}\]
Chapter:
Give a balanced equation for the following:
Conversion of acetic acid to ethyl acetate.
Chapter:
Convert (Indicate by reaction) acetaldehyde to acetaldoxime.
Chapter:
How acetone is converted into propane.
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Write the reaction when ethylamine is treated with Hinsberg’s reagent.
Chapter:
What is the action of the following reagent on ethyl amine?
Nitrous acid
Chapter: [13.01] Amines
Write increasing order of basicity for CH3NH2, (CH3)2NH and (CH3)3N.
Chapter:
What are monosaccharides?
Chapter: [14.01] Carbohydrates
Write the reactions involved in the preparation of Teflon.
Chapter: [15] Introduction to Polymer Chemistry [15] Polymers
Write the structure and name of monomer of Natural rubber.
Chapter: [15] Introduction to Polymer Chemistry [15] Polymers
Describe the important uses of high density polythene.
Chapter:
Name the γ-isomer of BHC.
Chapter: [16] Green Chemistry and Nanochemistry
Distinguish between crystalline solid and amorphous solid.
Chapter: [1] Solid State
Explain the bleaching action of chlorine in the presence of moisture.
Chapter:
Draw a neat, labelled diagram of a standard hydrogen electrode (SHE).
Chapter: [5] Electrochemistry
Calculate the e.m.f. of the following cell.
\[\ce{Mg | Mg{^{++}_{(aq)}} || Ag{^+_{(aq)}} | Ag}\]
If \[\ce{E^\circ_{Mg}}\] = −2.37 Volt and \[\ce{E^\circ_{Ag}}\] = 0.8 Volt.
Chapter:
State whether the following reaction is spontaneous or non spontaneous if ΔH = 50 kJ and ΔS = −130 JK−1 at 250 K.
Chapter:
Explain optical activity of 2-chlorobutane.
Chapter: [10] Halogen Derivatives
Define coordination number.
Chapter: [9] Coordination Compounds
Write structural formula for Methyl vinyl ether.
Chapter: [11] Alcohols, Phenols and Ethers [11.01] Alcohols [11.02] Phenols [11.03] Ethers
Explain Aldol condensation of ethanal.
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Write any four properties of interstitial compounds.
Chapter: [8] Transition and Inner Transition Elements
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