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
The strongest base amongst the following is
Methanamine
N-Methylmethanamine
N-Methylaniline
N,N-Dimethylmethanamine
Chapter: [0.13] Amines
The following types of solids contain molecules as constituent particles?
molecular solids
Ionic solids
metallic solids
covalent network solids
Chapter: [0.01] Solid State
The units of Henry’s law constant are ______.
bar dm3 mol–1
mol L–1 bar–1
L mol–1 bar–1
bar L–1 mol–1
Chapter: [0.02] Solutions
Effect of catalyst in a chemical reaction is to change the _______.
activation energy
equilibrium concentration
final products
heat of a reaction
Chapter: [0.06] Chemical Kinetics
The reagents used to convert phenol to 2,4,6-tribromophenol is _____________
Br2/CS2
Br2/CCl4
Br2/H2O
KBr aq.
Chapter: [0.11] Alcohols, Phenols and Ethers
Write oxidation number of iron in [Fe(CO)5]
Chapter: [0.09] Coordination Compounds
The type of mono halogen derivative in which a halogen atom is bonded to sp3 hybridized carbon atom next to carbon-carbon double bond is ______________
alkyl halide
allylic halide
vinylic halide
benzylic halide
Chapter: [0.1] Halogen Derivatives
The following pair of elements has half-filled d-orbitals.
Chromium and cobalt
Manganese and nickel
Chromium and manganese
Cobalt and nickel
Chapter: [0.08] Transition and Inner Transition Elements
The following reactants CANNOT be converted into carboxylic acid?
Dry ice
Cyclohexane
Toluene
Cyclohexene
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
The Henry’s law constant of a gas is 6.7 × 10–4 mol/(L bar). Its solubility when the partial pressure of the gas at 298 K is 0.65 bar is ______.
4.355 × 10–4 mol/L
4.355 × 10–2 mol/L
2.225 × 10–6 mol/L
2.225 × 10–2 mol/L
Chapter: [0.02] Solutions
Arrange the following compounds in increasing order of their boiling points.
Ethyl alcohol, Ethyl amine, Ethanoic acid, Ethane
Chapter: [0.13] Amines [13.01] Amines
Write the IUPAC name of [Fe(CN)6]4– ion.
Chapter: [0.09] Coordination Compounds
Name the reagent used to convert alkyl halide to ester.
Chapter: [0.1] Halogen Derivatives
Name the solution which is formed by passing sulfur dioxide in water.
Chapter: [0.07] Elements of Groups 16, 17 and 18
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Write the number of products when a mixture of ethanal and propanal is reacted with dilute alkali?
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
Draw the structure of α-D glucopyranose.
Chapter: [0.14] Biomolecules
If the total volume of a simple cubic unit cell is 6.817 × 10-23 cm3, what is the volume occupied by particles in the unit cell?
Chapter: [0.01] Solid State
Define the Nanochemistry.
Chapter: [0.16] Green Chemistry and Nanochemistry
Answer the following
Write the formula to calculate the % atom economy.
Chapter: [0.16] Green Chemistry and Nanochemistry
Explain the basic nature of amines with a suitable example.
Chapter: [0.13] Amines
Write the reactions involved in the preparation of phenol from benzene sulfonic acid.
Chapter: [0.11] Alcohols, Phenols and Ethers
What is cell constant? Write its SI unit.
Chapter: [0.05] Electrochemistry
Derive the relationship between standard cell potential and equilibrium constant of cell reaction.
Chapter: [0.05] Electrochemistry
Write four postulates of Werner’s theory.
Chapter: [0.09] Coordination Compounds
Explain primary benzylic halide shows higher reactivity by SN1 mechanism than other primary alkyl halide.
Chapter: [0.1] Halogen Derivatives
Write the features of reversible processes.
Chapter: [0.04] Chemical Thermodynamics
What is the action of following on proponal?
Hydroxyl amine
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
What is the action of following on proponal?
Hydrazine
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
For the reaction 2NOBr → 2NO2 + Br2, the rate law is rate = k[NOBr]2. If the rate of a reaction is 6.5 × 10–6 mol L–1 s–1, when the concentration of NOBr is 2 × 10–3 mol L–1. What would be the rate constant of the reaction?
Chapter: [0.06] Chemical Kinetics
The solubility product of BaCl2 is 4.0 × 10-8. What will be its molar solubility in mol dm-3?
Chapter: [0.03] Ionic Equilibria
Derive the expression for molar mass of solute in terms of boiling point elevation of solvent.
Chapter: [0.02] Solutions
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For the reaction 2A + B → C, rate of disappearance of A 0.076 mol s –1.
- What is the rate of formation of C?
- What is the rate of consumption of B?
- What is the rate of the overall reaction?
Chapter: [0.06] Chemical Kinetics
How will you bring about the following conversions?
isopropyl alcohol to acetone
Chapter: [0.11] Alcohols, Phenols and Ethers
How will you bring about the following conversions?
2-methyl propan-2-ol to 2-methylpropene
Chapter: [0.11] Alcohols, Phenols and Ethers
How will you bring about the following conversions?
acetone to 2-methylpropan-2-ol
Chapter: [0.11] Alcohols, Phenols and Ethers
Draw a neat and well labelled diagram of Standard Hydrogen Electrode. Also write its one application.
Chapter: [0.05] Electrochemistry
What are the types of ligands? Give one example of each type.
Chapter: [0.09] Coordination Compounds
How are the following conversions carried out?
propene to 1-iodopropane
Chapter: [0.1] Halogen Derivatives
How are the following conversions carried out?
propene to 2-nitropropane
Chapter: [0.1] Halogen Derivatives
How are the following conversions carried out?
benzene to biphenyl
Chapter: [0.1] Halogen Derivatives
Define the Enthalpy of vaporization.
Chapter: [0.04] Chemical Thermodynamics
Define the Standard enthalpy of combustion.
Chapter: [0.04] Chemical Thermodynamics
Why work done in vacuum is zero?
Chapter: [0.04] Chemical Thermodynamics
Write three physical properties of sulfuric acid.
Chapter: [0.07] Elements of Groups 16, 17 and 18
Answer the following
Give the similarities and differences in elements of 3d, 4d, and 5d series.
Chapter: [0.08] Transition and Inner Transition Elements
A substance crystallizes in fcc structure. The unit cell edge length is 367.8 pm. Calculate the molar mass of the substance if its density is 21.5 g/cm3.
Chapter: [0.01] Solid State
Three moles of an ideal gas are expanded isothermally from 15 dm3 to 20 dm3 at a constant external pressure of 1.2 bar, calculate the amount of work in Joules.
Chapter: [0.04] Chemical Thermodynamics
Distinguish between strong electrolyte and weak electrolyte.
Chapter: [0.03] Ionic Equilibria
Derive the equation pH + pOH = 14.
Chapter: [0.03] Ionic Equilibria
What happens when chlorine reacts with?
Al
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.03] Group 17 Elements
What happens when chlorine reacts with?
Na
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.03] Group 17 Elements
What happens when chlorine reacts with?
S8
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.03] Group 17 Elements
What happens when chlorine reacts with?
P4
Chapter: [0.07] Elements of Groups 16, 17 and 18 [7.03] Group 17 Elements
Write two applications of lanthanoids.
Chapter: [0.08] Transition and Inner Transition Elements
Write two applications of actinoids.
Chapter: [0.08] Transition and Inner Transition Elements
Draw structure of salicylaldehyde.
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids [12.01] Aldehydes and Ketones
Write reaction for preparation of acetophenone from benzoyl chloride.
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
Explain the acidic nature of carboxylic acids.
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
Explain the reactions involved in the preparation of viscose rayon.
Chapter: [0.15] Introduction to Polymer Chemistry [0.15] Polymers
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