HSC Science (General)
HSC Science (Electronics)
HSC Science (Computer Science)
Academic Year: 2020-2021
Date: अप्रैल 2021
Duration: 3h
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- The question paper is divided into four sections.
- Section A: Q. No. 1 contains Ten multiple-choice type of questions carrying One mark each.
- Section A: Q. No. 2 contains Eight very short answer type of questions carrying One mark each.
- Section B: Q. No. 3 to Q. No. 14 contains Twelve short answer type of questions carrying Two marks each. (Attempt any Eight).
- Section C: Q. No.15 to Q. No. 26 contains Twelve short answer type of questions carrying Three marks each. (Attempt any Eight).
- Section D: Q.No. 27 to Q. No. 31 contains 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 each MCQ, correct answer must be written along with its alphabet.
e.g., (a) ..... / (b ) .... / ( c ) .... / ( d) ..... Only first attempt will be considered for evaluation. - Draw well labeled diagrams and write balanced equations wherever necessary.
- Given data:
Atomic mass of C = 12, H = 1, O = 16
Atomic number (Z): Mn = 25, Fe = 26, Ce = 58, Ar = 18,
R = 8.314 J K-1 mol-1 or 0.083 L bar K-1 mol-1
Bottom ash of thermal power stations can be used as raw material for cement and brick industry. This example illustrates which of the following principle of green chemistry?
Atom economy.
Designing safer chemicals.
Design for energy efficiency.
Prevention of waste or by products.
Chapter: [0.16] Green Chemistry and Nanochemistry
The sugar component of nucleotide unit in RNA is _________________
α-deoxy-D-ribose
D-ribose
L-ribose
2-deoxy-L-ribose
Chapter: [0.14] Biomolecules
The theory which explain amphoteric nature of water is ______.
Arrhenius theory
Lewis theory
Ostwald theory
Bronsted-Lowry theory
Chapter: [0.03] Ionic Equilibria
The charge on metal ion in [Fe(CN)6]4− is _________
+2
+3
+4
+5
Chapter: [0.09] Coordination Compounds
An intensive property amongst the following is ______.
Mass
Volume
Number of moles
Temperature
Chapter: [0.04] Chemical Thermodynamics
Acidic strength of halogen acids increases in the order of _______.
HF > HCl > HBr > HI
HCl > HF > HBr > HI
HBr > HCl > HF > HI
HI > HBr > HCl > HF
Chapter: [0.07] Elements of Groups 16, 17 and 18
The following electronic configuration of elements shows highest oxidation state
3d54s2
3d54s1
3d104s2
3d104s1
Chapter: [0.08] Transition and Inner Transition Elements
Which of the following is the product of reaction of ethane nitrile with Grignard reagent followed by acid hydrolysis?
a ketone
an aldehyde
an acid
an acid chloride
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones
The pKb of weak base BOH [Kb(BOH) = 1 × 10-5] will be ______.
-5
5
1
10-5
Chapter: [0.03] Ionic Equilibria
Sodium crystallizes in bcc structure. If the edge length of unit cell is 4.3 × 10-8 cm, the radius of Na atom is ______.
1.86 × 10-8 cm
1.52 × 10-8 cm
2.15 × 10-8 cm
4.3 × 10-8 cm
Chapter: [0.01] Solid State [0.01] Solid State
Name the catalyst used to manufacture H2SO4 by contact process.
Chapter: [0.16] Green Chemistry and Nanochemistry
Label the one conjugate acid-base pair in the following reaction.
\[\ce{CO^{2-}_{3(aq)} + H2O_{(l)} ⇌ OH^- + HCO^-_3}\]
Chapter: [0.03] Ionic Equilibria
Write the type of isomerism exhibited by [Co(NH3)5(NO2)]2+ and [Co(NH3)5ONO]2+ pair of complex ion.
Chapter: [0.09] Coordination Compounds
Complete the following reaction:
\[\ce{SO_{2(g)} + Cl_{2(g)} ->[Charcoal]}\] ?
Chapter: [0.07] Elements of Groups 16, 17 and 18
Write the order of ionic character of halides with monovalent metal (M).
Chapter: [0.07] Elements of Groups 16, 17 and 18
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Write formula to calculate magnetic moment.
Chapter: [0.08] Transition and Inner Transition Elements
Write chemical formula of ore of zinc.
Chapter: [0.08] Transition and Inner Transition Elements
The vapour pressures of pure liquids A and B are 0.600 bar and 0.933 bar respectively, at a certain temperature.
What is the mole fraction of liquid B in the solution when the total vapour pressure of their mixture is 0.8 bar?
Chapter: [0.02] Solutions
Complete and write the following table
| Reaction | Name of catalyst |
| i) Manufacture of HDPE polymer | ________________ |
| ii) _______________ | V2O5 |
Chapter: [0.16] Green Chemistry and Nanochemistry
Write the name of raw material used for preparation of nylon 6, 6 polymer.
Chapter: [0.15] Introduction to Polymer Chemistry [0.15] Polymers
Give two points to explain why vapour pressure of solvent is lowered by dissolving nonvolatile solute into it.
Chapter: [0.02] Solutions
Explain with the help of a potential energy diagram that the catalyst increases the rate of the reaction.
Chapter: [0.06] Chemical Kinetics
Write one example of each of bidentate and ambidentate ligand.
Chapter: [0.09] Coordination Compounds
Define the Standard enthalpy of combustion.
Chapter: [0.04] Chemical Thermodynamics
Define the Enthalpy of sublimation.
Chapter: [0.04] Chemical Thermodynamics
Elements of group 16 have lower ionization enthalpy values compared to those of group 15 elements. Explain why?
Chapter: [0.07] Elements of Groups 16, 17 and 18
Manganese in the +2 oxidation state is more stable than +3 oxidation state where as iron is stable at +3 oxidation state than +2 oxidation state. Explain why?
Chapter: [0.08] Transition and Inner Transition Elements [8.02] F-block Elements
Carboxylic acids have higher boiling points than those of ethers. Give reason.
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
What is the action of Grignard reagent on benzonitrile?
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
Write a chemical reaction for the preparation of the following polymer.
polyacrylonitrile
Chapter: [0.15] Introduction to Polymer Chemistry [0.15] Polymers
The enthalpy change of the following reaction:
\[\ce{CH_{4(g)} + Cl_{2(g)} -> CH3Cl_{(g)} + HCl_{(g)}ΔH^0 = –104 kJ}\]
Calculate C – Cl bond enthalpy. The bond enthalpies are:
| Bond | C − H | Cl − Cl | H − Cl |
| ∆H°/kJ mol−1 | 414 | 243 | 431 |
Chapter: [0.04] Chemical Thermodynamics
Write a chemical reaction to convert glucose into glucose cyanohydrin.
Chapter: [0.14] Biomolecules
Derive the equation which implies that the degree of dissociation of weak acid is inversely proportional to the square root of its concentration.
Chapter: [0.03] Ionic Equilibria
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Compound ‘A’ with molecular formula C6H5Cl is fused with NaOH at high temperature under pressure to give compound ‘B’. Compound ‘B’ on treatment with dil.HCl gives compound C having characteristic carbolic odour. Write the chemical equations in support of this. Name the process and give uses of compound C.
Chapter: [0.11] Alcohols, Phenols and Ethers
Calculate `"E"_"cell"^circ` of the following galvanic cell:
Mg(s) / Mg2+(1 M) // Ag+ (1 M) / Ag(s) if `"E"_"Mg"^circ` = – 2.37 V and `"E"_"Ag"^circ` = 0.8 V. Write cell reactions involved in the above cell. Also mention if cell reaction is spontaneous or not.
Chapter: [0.05] Electrochemistry
Draw the geometrical isomers of the following complexes [Pt(NH3)(H2O)Cl2].
Chapter: [0.09] Coordination Compounds
Draw the geometrical isomers of the following complexes [Co(NH3)4Cl2]+
Chapter: [0.09] Coordination Compounds
An organic compound A with molecular formula C4H10O on treatment with phosphorus pentachloride gives alkyl chloride. Alkyl chloride on treatment with Mg in presence of dry ether gives a highly reactive compound B.
Compound B reacts with water to give hydrocarbon C. Alkyl chloride on treatment with Na in dry ether as a solvent gives alkane, 2,2,3,3-tetramethylbutane. Identify ‘A’, ‘B’, ‘C’
Chapter: [0.1] Halogen Derivatives
Derive the expression for work done in chemical reaction. Write the relationship between ∆H and ∆U for an isochoric process.
Chapter: [0.04] Chemical Thermodynamics
What is the oxidation state of sulfur in the following?
Sulfurous acid
Chapter: [0.07] Elements of Groups 16, 17 and 18
What is oxidation state of sulfur in the following?
Sulfuric acid
Chapter: [0.07] Elements of Groups 16, 17 and 18
What is oxidation state of sulfur in the following?
Peroxymonosulfuric acid
Chapter: [0.07] Elements of Groups 16, 17 and 18
What are rare earth elements?
Chapter: [0.08] Transition and Inner Transition Elements
Write any two properties of actinides.
Chapter: [0.08] Transition and Inner Transition Elements
Write any two uses of actinides.
Chapter: [0.08] Transition and Inner Transition Elements
What is the action of following reagents on ethanoic acid?
SOCl2/heat
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones
What is the action of following reagents on ethanoic acid?
sodalime/heat
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones
What is the action of following reagents on ethanoic acid?
P2O5/heat
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones
A solution containing 3 g of solute A (M = 60 g/mol) in 1 L solution is isotonic with a solution containing 8.55 g of solute B in 500 mL solution. What is the molar mass of B?
Chapter: [0.02] Solutions
What is the action of following on phenol at low temperature?
- dil. HNO3
- conc. H2SO4
- Br2/CS2
Chapter: [0.11] Alcohols, Phenols and Ethers
What is dehydrohalogenation? State the rule for the formation of the preferred product of dehydrohalogenation.
Chapter: [0.1] Halogen Derivatives
Write the equations for the preparation of ethyl chloride using
- Hydrogen halide
- ethene
- Thionyl chloride
Which of these methods is preferred and why?
Chapter: [0.1] Halogen Derivatives
Calculate the voltage of the cell Sn(s) / Sn2+(0.02 M) // Ag+ (0.01 M) / Ag(s) at 25 °C.
Given: `"E"_"Sn"^circ` = - 0.136, `"E"_"Ag"^circ` = 0.800 V
Chapter: [0.05] Electrochemistry
Derive an expression for the relation between half-life and rate constant for first-order reaction.
Chapter: [0.06] Chemical Kinetics
The half-life period for the first order reaction is 1.7 hrs. How long will it take for 20% of the reactant to disappear?
Chapter: [0.06] Chemical Kinetics
Derive the relationship between density of substance, its molar mass, and the unit cell edge length. Explain how you will calculate the number of particles, and a number of unit cells in x g of metal.
Chapter: [0.01] Solid State
Write the factors influencing the basicity of amines.
Chapter: [0.13] Amines
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