Date & Time: 12th March 2022, 10:30 am
Duration: 3h30m
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 contain 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 contain Five long answer type of questions carrying Four marks each. (Attempt any Three).
- Use of the log table is allowed. Use of calculator is not allowed.
- Figures to the right indicate full marks.
- For each multiple-choice type of question, it is mandatory to write the correct answer along with its alphabet. e.g., (a)......../(b)......../(c)......./(d)........
No marks(s) shall be given if ONLY the correct answer or the alphabet of the correct answer is written. Only the first attempt will be considered for evaluation.
The coordination number of atoms in body-centred cubic structure (bcc) is ______.
4
6
8
12
Chapter: [0.01] Solid State
Choose the most correct option.
In calculating osmotic pressure the concentration of solute is expressed in _______.
molarity
molality
mole fraction
mass percent
Chapter: [0.02] Solutions and Colligative Properties [0.02] Solutions
The enthalpy change for the chemical reaction \[\ce{H2O_{(s)} -> H2O_{(l)}}\] is called enthalpy of ______.
vapourisation
fusion
combustion
sublimation
Chapter: [0.04] Chemical Thermodynamics
Which of the following transition element shows maximum oxidation state?
Sc
Fe
Mn
V
Chapter: [0.08] Transition and Inner Transition Elements
The correct formula for the complex compound, sodium hexacyanoferrate (III) is ______.
Na [Fe(CN)6]
Na2 [Fe(CN)6]
Na3 [Fe(CN)6]
Na4 [Fe(CN)6]
Chapter: [0.09] Coordination Compounds
Isopropylbenzene on air oxidation followed by decomposition by dilute acid gives ______.
C6H5OH
C6H5COOCH3
C6H5COOH
C6H5CHO
Chapter: [11.02] Phenols
The name of metal nanoparticle which acts as highly effective bacterial disinfectant in water purification process is ______.
carbon black
silver
gold
copper
Chapter: [0.16] Green Chemistry and Nanochemistry
Acid anhydride on reaction with primary amine gives compound having a functional group ______.
amide
nitrile
secondary amine
imine
Chapter: [12.02] Carboxylic Acids
The standard potential of the cell in the following reaction is ______.
\[\ce{Cd_{(s)} + Cu^{2+}_{(1M)} -> Cd^{2+}_{(1M)} + Cu_{(s)}}\]
`("E"_("Cd")^circ = - 0.403V, "E"_("Cu")^circ = 0.334V)`
– 0.737 V
0.737 V
– 0.069 V
0.069 V
Chapter: [0.05] Electrochemistry
The value of [H3O+] in mol lit–1 of 0.001 M acetic acid solution (Ka = 1.8 × 10–5) is ______.
1.34 × 10–1
1.34 × 10–2
1.34 × 10–3
1.34 × 10–4
Chapter: [0.05] Electrochemistry
Write the product formed when alkyl halide reacts with silver nitrite.
Chapter: [0.1] Halogen Derivatives
Write the name of product formed, when acetone is treated with 2, 4-dinitrophenyl hydrazine.
Chapter: [12.01] Aldehydes and Ketones
Write the name of biodegradable polyamide copolymer.
Chapter: [0.15] Polymers [0.15] Introduction to Polymer Chemistry
Identify the molecularity of following elementary reaction:
NO(g) + O3(g) → NO3(g) + O(g)
Chapter: [0.06] Chemical Kinetics
What is the action of selenium on magnesium metal?
Chapter: [0.07] Elements of Groups 16, 17 and 18
Write the name of isomerism in the following complexes:
[Cu(NH3)4] [PtCl4] and [Pt(NH3)4] [ CuCl4]
Chapter: [0.09] Coordination Compounds
Write the name of the alloy used in the Fischer Tropsch process in the synthesis of gasoline.
Chapter: [0.08] Transition and Inner Transition Elements
Henry's law constant for CH3Br(g) is 0.159 mol dm–3 bar–1 at 25°C. What is the solubility of CH3Br(g) in water at the same temperature and partial pressure of 0.164 bar?
Chapter: [0.02] Solutions
Explain pseudo first order reaction with a suitable example.
Chapter: [0.06] Chemical Kinetics
Write the consequences of Schottky defect with reasons.
Chapter: [0.01] Solid State
What is the action of following on ethyl bromide:
Na in dry ether
Chapter: [0.1] Halogen Derivatives
What is the action of following on ethyl bromide:
Mg in dry ether
Chapter: [0.1] Halogen Derivatives
Explain formation of peptide linkage in protein with an example.
Chapter: [14.02] Proteins
Derive an expression to calculate molar mass of non-volatile solute by osmotic pressure measurement.
Chapter: [0.02] Solutions and Colligative Properties [0.02] Solutions
Explain monodentate and ambidentate ligands with example.
Chapter: [0.09] Coordination Compounds
Explain the trends in the following atomic properties of group 16 elements:
Atomic radii
Chapter: [0.07] Elements of Groups 16, 17 and 18
Explain the trends in the following atomic properties of group 16 elements:
Ionisation enthalpy
Chapter: [0.07] Elements of Groups 16, 17 and 18
Explain the trends in the following atomic properties of group 16 elements:
Electronegativity
Chapter: [0.07] Elements of Groups 16, 17 and 18
Explain the trends in the following atomic properties of group 16 elements:
Electron gain enthalpy
Chapter: [0.07] Elements of Groups 16, 17 and 18
Write preparation of phenol from aniline.
Chapter: [11.02] Phenols
Write chemical reactions to prepare ethanamine from:
Acetonitrile
Chapter: [11.01] Alcohols
Write chemical reactions to prepare ethanamine from:
Nitroethane
Chapter: [11.01] Alcohols
Identify A and B from the following reaction:
\[\begin{array}{cc}
\ce{CH3}\phantom{.................}\\
|\phantom{....................}\\
\phantom{}\ce{2CH3 - C = O ->[Ba(OH)2] A ->[Δ] B + H2O}
\end{array}\]
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
One mole of an ideal gas is expanded isothermally and reversibly from 10 L to 15 L at 300 K. Calculate the work done in the process.
Chapter: [0.04] Chemical Thermodynamics
How many moles of electrons are required for reduction of 2 moles of Zn2+ to Zn? How many Faradays of electricity will be required?
Chapter: [0.05] Electrochemistry
Write chemical composition of haematite. Write the names and electronic configurations of first two elements of group 17.
Chapter: [0.08] Transition and Inner Transition Elements
Write classification of polymers on the basis of structure.
Chapter: [0.15] Introduction to Polymer Chemistry
Answer the following
Define: Green chemistry
Chapter: [0.16] Green Chemistry and Nanochemistry
Write two disadvantages of nanotechnology.
Chapter: [0.16] Green Chemistry and Nanochemistry
Write a commercial method for preparation of glucose.
Chapter: [0.14] Biomolecules
Write structure of adipic acid.
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
Write chemical reactions of following reagents on methoxyethane:
hot HI
Chapter: [0.11] Alcohols, Phenols and Ethers
Write chemical reactions of following reagents on methoxyethane:
PCl5
Chapter: [11.03] Ethers
Write chemical reactions of following reagents on methoxyethane:
dilute H2SO4
Chapter: [11.01] Alcohols
Explain cationic, anionic and neutral sphere complexes w ith example.
Chapter: [0.09] Coordination Compounds
Calculate spin only magnetic moment of divalent cation of transition metal with atomic number 25.
Chapter: [0.08] Transition and Inner Transition Elements
Salts of Ti4+ are colourless. Give reason.
Chapter: [0.08] Transition and Inner Transition Elements
What is lanthanoid contraction?
Chapter: [0.08] Transition and Inner Transition Elements
Write preparation of acetic acid from:
dry ice
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
Write preparation of acetic acid from:
acetyl chloride
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
Write a classification of aliphatic ketones with a suitable example.
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
What is the action of sodium hypoiodite on acetone?
Chapter: [12.01] Aldehydes and Ketones
Define the half-life of a first-order reaction.
Chapter: [0.06] Chemical Kinetics
Obtain the expression for half-life and rate constant of the first-order reaction.
Chapter: [0.06] Chemical Kinetics
Calculate the standard enthalpy of formation of CH3OH(l) from the following data:
- \[\ce{CH3OH_{(l)} + 3/2 O2_{(g)} -> CO2_{(g)} + 2H2O_{(l)}ΔH^° = - 726 kJ mol^{-1}}\]
- \[\ce{C_{(s)} + O2_{(g)} → CO2_{(g)}Δ_cH^° = – 393 kJ mol^{-1}}\]
- \[\ce{H2_{(g)} + 1/2 O2_{(g)} -> H2O_{(l)}Δ_fH^° = - 286 kJ mol^{-1}}\]
Chapter: [0.04] Chemical Thermodynamics
Calculate the pH of buffer solution composed of 0.01 M weak base BOH and 0.02 M of its salt BA. [Kb = 1.8 × 10–5 for weak base]
Chapter: [0.03] Ionic Equilibria
Define the following term:
isotonic solution
Chapter: [0.02] Solutions and Colligative Properties [0.02] Solutions
Define Osmosis
Chapter: [0.02] Solutions and Colligative Properties [0.02] Solutions
Gold crystallises into face-centred cubic cells. The edge length of a unit cell is 4.08 × 10–8 cm. Calculate the density of gold. [Molar mass of gold = 197 g mol–1]
Chapter: [0.01] Solid State
Write the mathematical equation for the first law of thermodynamics for:
Isothermal process
Chapter: [0.04] Chemical Thermodynamics
Write the mathematical equation for the first law of thermodynamics for:
Adiabatic process
Chapter: [0.04] Chemical Thermodynamics
Derive the relationship between pH and pOH.
Chapter: [0.03] Ionic Equilibria
Define Reference electrode
Chapter: [0.05] Electrochemistry
Answer the following in one or two sentences.
Write any two functions of salt bridge.
Chapter: [0.05] Electrochemistry
Draw a neat, labelled diagram of a standard hydrogen electrode (SHE).
Chapter: [0.05] Electrochemistry
Explain metal deficiency defect with examples.
Chapter: [0.01] Solid State
Write the chemical equation for the preparation of sulphur dioxide from sulphur.
Chapter: [7.02] Group 16 Elements
Write uses of sulphur.
Chapter: [7.02] Group 16 Elements
Write chemical reactions for the following conversions:
Ethyl bromide to ethyl methyl ether.
Chapter: [12.01] Aldehydes and Ketones
Write chemical reactions for the following conversions:
Ethyl bromide to ethene.
Chapter: [11.03] Ethers
Write chemical reactions for the following conversions:
Bromobenzene to toluene.
Chapter: [0.1] Halogen Derivatives
Write chemical reactions for the following conversions:
Chlorobenzene to biphenyl.
Chapter: [0.1] Halogen Derivatives
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Maharashtra State Board previous year question papers 12th Standard Board Exam Chemistry with solutions 2021 - 2022
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