Exam Details
2020 Paper - II Chemistry
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120
Duration
180 mins
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Combined Medical Services Examination - Previous Year Papers
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120questions
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120questions
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PYP
2020 Paper - II Chemistry
Consider the following statements regarding radial and total angular function of H-atom:
1. The radial function R(r) depends on the quantum number n and l
2. The total angular function depends only on the direction and is independent of the distance from the nucleus (r)
Which of the statements given above is/are correct?
PYP
2020 Paper - II Chemistry
Which one of the following is the correct electronic configuration of gold (ground state)?
PYP
2020 Paper - II Chemistry
Which one of the following is the correct order of increasing acidic nature of oxides?
PYP
2020 Paper - II Chemistry
Which one of the following is the correct outermost electronic configuration of representative elements?
PYP
2020 Paper - II Chemistry
The name of the element given by IUPAC with atomic number 118 is:
PYP
2020 Paper - II Chemistry
Which one of the following statements regarding actinoid metals is NOT correct?
PYP
2020 Paper - II Chemistry
Which one of the following is the correct order of ionic radius?
PYP
2020 Paper - II Chemistry
Which one among the following elements has the highest second ionization potential?
PYP
2020 Paper - II Chemistry
Consider the following statements regarding magnetism of two complexes:
1. [CoF6]3− is a paramagnetic and high spin complex
2. [Co(NH3)6]3+ is a diamagnetic and low spin complex
Which of the statements given above is/are correct?
PYP
2020 Paper - II Chemistry
Consider the following statements in respect of alkali metal halides:
1. The low solubility of LiF in water is due to its high lattice enthalpy
2. The low solubility of CsI in water is due to smaller hydration enthalpy of its two ions
Which of the statements given above is/are correct?
PYP
2020 Paper - II Chemistry
When the radius ratio in an ionic crystal lies between 0.732 – 0.999, the coordination number will be:
PYP
2020 Paper - II Chemistry
Which one of the following is the correct order of thermal stabilities of metal carbonates?
PYP
2020 Paper - II Chemistry
Which one of the following is the correct order of increasing covalent character of halides of Al3+?
PYP
2020 Paper - II Chemistry
The appearance of colour in solid alkali metal halides is generally due to:
PYP
2020 Paper - II Chemistry
Match List-I with List-II and select the correct answer using the code given below the lists:
List-I (Molecule/ion) List-II (Shape)
A. H2O 1. Linear
B. BF3 2. Angular
C. I3- 3. Trigonal planar
D. SF4 4. See-saw
Code:
A B C D
PYP
2020 Paper - II Chemistry
In which of the following molecules/ions, all the bond lengths are NOT equal?
PYP
2020 Paper - II Chemistry
Which one of the following exhibits highest bond order?
PYP
2020 Paper - II Chemistry
How many resonating structures are possible for NO3- ion?
PYP
2020 Paper - II Chemistry
Consider the following statements for the complex [Ni(NH3)6]Cl2:
Which of the statements given above are correct?
1. It is an outer orbital octahedral complex
2. Hybridization of Ni is sp3 d2
3. It is a paramagnetic complex
4. It is a diamagnetic complex
PYP
2020 Paper - II Chemistry
Sodium nitroprusside when added to an alkaline solution of sulphide ion gives red coloured solution. The red colouration is due to the formation of:
PYP
2020 Paper - II Chemistry
The complex ions [NiCl4]2– and [Ni(CN)4]2– are:
PYP
2020 Paper - II Chemistry
Consider the following complexes:
1. [Fe(H2O)6]2+
2. [Fe(CN)6]3–
3. [Fe(CN)6]4–
4. [Fe(H2O)6]3+
Which one of the following is the correct order of number of unpaired electrons in the above complexes?
PYP
2020 Paper - II Chemistry
The denticity of ligands glycinate, iminodiacetic acid and nitrilotriacetic acid are:
PYP
2020 Paper - II Chemistry
Which one of the following is the IUPAC name of the complex K3[Fe(CN)6]?
PYP
2020 Paper - II Chemistry
Which one of the following complexes will NOT show geometrical isomerism?
PYP
2020 Paper - II Chemistry
Which one of the following complexes exhibits optical isomerism?
PYP
2020 Paper - II Chemistry
Consider the following complex ions:
1. [Co(en)3]3+
2. cis-[Co(en)2Cl2]+
3. trans-[Co(en)2Cl2]+
Which of the complex ion(s) given above show(s) optical activity?
PYP
2020 Paper - II Chemistry
A solution is obtained by mixing 10 ml of 0.2 N KOH solution with 30 ml of 0.1 N CH3COOH. The pH of the solution would be:
(Given: pKa of CH3COOH = 4.75; log 2 = 0.30)
PYP
2020 Paper - II Chemistry
What will be the hydrogen ion concentration of a solution obtained by mixing 500 ml of 0.20 M acetic acid and 500 ml of 0.30 M sodium acetate?
(Dissociation constant of acetic acid = 1.75 × 10−5)
PYP
2020 Paper - II Chemistry
Which one of the following represents the correct order of acid strength?
PYP
2020 Paper - II Chemistry
Consider the following hydroxides:
1. Be(OH)2
2. Sr(OH)2
3. Mg(OH)2
4. Ba(OH)2
The correct order of basicity of the above hydroxides will be:
PYP
2020 Paper - II Chemistry
Which one of the following is the correct order of Lewis Acidity in Boron halides?
PYP
2020 Paper - II Chemistry
Which one of the following statements regarding acid-base property is NOT correct?
PYP
2020 Paper - II Chemistry
What will be the value of pOH of 0.03M aqueous solution of HCl at 25°C?
(Given log 0.03 = -1.52)
PYP
2020 Paper - II Chemistry
What will be the value of mole fraction of the solute in 1.00 molal aqueous solution?
PYP
2020 Paper - II Chemistry
Equivalent weight of K2Cr2O7 in acidic medium will be:
(Atomic weight of K = 39, Cr = 52 and O = 16)
PYP
2020 Paper - II Chemistry
Which one of the following is a primary standard substance?
PYP
2020 Paper - II Chemistry
The equivalence point of titration of oxalate solution (acidic medium) with KMnO4 solution will be:
PYP
2020 Paper - II Chemistry
In which of the following titrations, an external indicator is NOT necessary?
PYP
2020 Paper - II Chemistry
Which one among the following is a metal ion type indicator?
PYP
2020 Paper - II Chemistry
At what temperature does the total kinetic energy of 0.3 mole of Helium equals the total kinetic energy of 0.4 mole of Argon at 400 K?
PYP
2020 Paper - II Chemistry
The ratio of Boyle’s temperature (T_B) and critical temperature (T_C) of a gas obeying van der Waals equation is given by:
PYP
2020 Paper - II Chemistry
Weight of O₂ necessary to fill up a cylinder of 0.082 litre capacity at 0°C and 96 atm pressure would be:
(Compressibility factor = 0.96 and gas constant (R) = 0.082 dm³ atm K⁻1 mol⁻1)
PYP
2020 Paper - II Chemistry
Which one of the following gas samples will have the highest average molecular speed?
(Atomic weight of O = 16, Ne = 20, C = 12 and He = 4)
PYP
2020 Paper - II Chemistry
The root mean square velocity of a monoatomic gas of molar mass ‘M’ (g mol⁻1) is ‘u’. What is the correct relation between ‘u’ and average kinetic energy (E) per mole?
PYP
2020 Paper - II Chemistry
The amount of energy (per mole of a monoatomic gas) that will increase by increasing the temperature by one degree at constant volume is:
PYP
2020 Paper - II Chemistry
Which one among the following gases has the largest mean free path under the same external conditions?
PYP
2020 Paper - II Chemistry
50 mL of H2 gas diffuses through a small hole from a vessel in 20 minutes. Time taken by 40 mL of O2 gas to diffuse under similar condition will be:
PYP
2020 Paper - II Chemistry
What will be the slope of the plot of log P vs log V for a reversible adiabatic expansion of an ideal gas? [γ = Cp/Cv]
PYP
2020 Paper - II Chemistry
The latent heat of vaporization of Br2 at 59°C and at 1 atm pressure is 29.2 kJ mol-1. The value of ΔU would be:
(R = 8.314 × 10-3 kJ mol-1 K-1)
PYP
2020 Paper - II Chemistry
The ratio of specific heat of gases at constant pressure (Cp) and constant volume (Cv) of N2 molecule is:
PYP
2020 Paper - II Chemistry
The total heat content of a system at constant pressure is known as:
PYP
2020 Paper - II Chemistry
In the Joule-Thomson expansion of real gas at inversion temperature, the Joule-Thomson coefficient:
PYP
2020 Paper - II Chemistry
For N2(g) + 3H2(g) ⇌ 2 NH3(g), the expression for ΔH is:
PYP
2020 Paper - II Chemistry
The entropy of vaporization of a liquid is 100 J mol−1K−1 and it boils at 300K. What would be the value of ΔHvap?
PYP
2020 Paper - II Chemistry
The maximum efficiency of a Carnot engine operating between 100°C to 200°C will be:
PYP
2020 Paper - II Chemistry
Which one of the following is the correct thermodynamic equation of state?
PYP
2020 Paper - II Chemistry
Which one of the following changes will necessarily lead to a non-spontaneous change?
PYP
2020 Paper - II Chemistry
Equal volumes of what concentrations of AgNO3 and HCl should be mixed to form a AgCl precipitate? [Ksp for AgCl = 10⁻10]
PYP
2020 Paper - II Chemistry
The solubility product of Ag2CrO4 is 32 × 10⁻12. What is the concentration of CrO4²- ion in that solution?
PYP
2020 Paper - II Chemistry
What will be the degree of dissociation of 0.1 (M) Ba(NO3)2 solution, if van’t Hoff factor of the solution is 2.74?
PYP
2020 Paper - II Chemistry
Which one of the following colligative properties can provide the most precise molar mass of peptides?
PYP
2020 Paper - II Chemistry
At 298 K, the total vapour pressure in Torr for a mixture of volatile components A and B is given by P = 120–75 χB (χB is the mole fraction of B). What is the vapour pressure of pure A and B (in Torr) respectively?
PYP
2020 Paper - II Chemistry
Which one of the following equations represents the correct relation between relative lowering in vapour pressure and osmotic pressure (π) for a dilute aqueous solution?
PYP
2020 Paper - II Chemistry
A 1% aqueous solution (mass by volume) of a certain substance is isotonic with a 3% solution of glucose (Molar mass = 180 g mol−1) at a given temperature. The molar mass of the substance (in kg mol−1) will be:
PYP
2020 Paper - II Chemistry
Which among the following is the correct order for osmotic pressure of equimolar solutions of glucose, sodium chloride and barium chloride?
PYP
2020 Paper - II Chemistry
0.05 molal aqueous solution of K4[Fe(CN)6] freezes at −0.26°C. Its degree of dissociation will be: (k_f = 1.86°C Kg mol−1)
PYP
2020 Paper - II Chemistry
What will be the value of freezing point depression constant of cyclobutane having freezing point of 280 K and molar enthalpy of fusion of 2.68 kJ mol-1?
(Molar mass of cyclobutane = 56.108 g mol-1 and R= 8.314 JK-1 mol-1)
PYP
2020 Paper - II Chemistry
Which one of the following statements is correct about the Henry’s law?
PYP
2020 Paper - II Chemistry
What will be the ratio of mole fractions of O2 and N2 dissolved in water at 25°C?
(Given that Henry’s law constant (in torr) for O2 and N2 are 3.3 × 107 and 6.5 × 107 respectively at 25°C; mole fractions of O2 and N2 in air are taken as 0.2 and 0.8 respectively)
PYP
2020 Paper - II Chemistry
The cell constant with 0.1 N KCl solution is found to be 0.98 cm-1 and the resistance offered by 0.01 N HCl is 89 Ω. The specific conductance of HCl will be:
PYP
2020 Paper - II Chemistry
What will be the correct order of mobility of the following alkali metal ions in aqueous solution?
PYP
2020 Paper - II Chemistry
During electrolysis of silver nitrate solution, loss in the anode compartment was 0.589 g. In a Voltameter connected in series, 1.259 g of silver was deposited. What would be the transport number of two ions?
PYP
2020 Paper - II Chemistry
The molar conductivities of KOAc and HCl at infinite dilution in water at 256C are 90.0 and 426.2 S cm2 mol-1, respectively. To calculate the molar conductivity of HOAc at infinite dilution, the additional molar conductivity value of which one of the following electrolytes will be required?
PYP
2020 Paper - II Chemistry
What will be the effect of dilution on specific and equivalent conductance of an aqueous solution of a strong electrolyte?
PYP
2020 Paper - II Chemistry
The mean ionic activity co-efficient is denoted as , while that of cation and anion are denoted as + and - , respectively. The correct relation among them will be:
(Given that + and - are the number of cations and the anions respectively in the molecular formula of the compound)
(a) = 1 + + - (+ + -)
(b) = (+ - ) 1 + + -
(c) = (+ - ) 1 + + -
(d) = 1 + + - (+ + + - -)
PYP
2020 Paper - II Chemistry
The specific conductance of 0.01 M solution of acetic acid was found to be 0.015 S m-1 at 25°C. Molar conductance of acetic acid at infinite dilution is 400 × 10-4 S m2 mol-1. The degree of dissociation of acetic acid will be:
PYP
2020 Paper - II Chemistry
In a moving boundary experiment with 0.01 mole LiCl, the boundary in a tube with cross sectional area of 0.125 cm2 moves through 8.1 cm in 1500 sec for a current of 1.8 × 10-3 ampere. What will be the value of transport number of Cl-? (Given that F = 96,500 Coulomb and temperature is 300K)
PYP
2020 Paper - II Chemistry
When HCl is titrated against NaOH, the conductance at the end point is:
PYP
2020 Paper - II Chemistry
A cell is bathed in a solution that has a greater osmolarity than that of cytosol. The solution can be described as:
PYP
2020 Paper - II Chemistry
Which cationic species is more stable in each of the following pairs?
Pair X: (structures shown)
Pair Y: (structures shown)
[IMAGE]
PYP
2020 Paper - II Chemistry
Which one of the following structures is non-aromatic?
(a) (structure shown)
(b) (structure shown)
(c) (structure shown)
(d) (structure shown)
[IMAGE]
PYP
2020 Paper - II Chemistry
The o/p-directing effect of methyl group in electrophilic substitution reaction of toluene is due to:
PYP
2020 Paper - II Chemistry
The relative order of basicity of the following amines is:
1 2 3 4
[IMAGE]
PYP
2020 Paper - II Chemistry
Which molecule in each of the following pairs has a higher dipole moment?
Pair X: 1 2
Pair Y: 3 4
[IMAGE]
PYP
2020 Paper - II Chemistry
Which one of the following carbocations is NOT expected to rearrange?
(a) (b) (c) (d)
[IMAGE]
PYP
2020 Paper - II Chemistry
Classify the following species as electrophiles (E) and nucleophiles (N) in organic reactions:
SO3, Cl+, NO2+, CH3NH2, H3O+, BH3, CN-
PYP
2020 Paper - II Chemistry
Which one of the following molecules does NOT exist as a meso isomer?
(a) [IMAGE]
(b) [IMAGE]
(c) [IMAGE]
(d) [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
Which one of the following molecules does NOT have a plane of symmetry?
(a) [IMAGE]
(b) [IMAGE]
(c) [IMAGE]
(d) [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
Which one of the following amino acids is achiral?
PYP
2020 Paper - II Chemistry
Consider the following compound [A]:
CH3
H | Br
H | CH3
CH2CH3
[A]
Which one of the following represents an enantiomer of [A]?
[IMAGE]
PYP
2020 Paper - II Chemistry
The total number of optical isomers possible for cholesterol is: [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
Consider the following groups attached to a chiral carbon centre:
—C≡CH —CH(CH3)2 —CH2CH3 —CH=CH2
1 2 3 4
What is the decreasing order of priority of above groups based on Cahn-Ingold-Prelog (CIP)-nomenclature?
PYP
2020 Paper - II Chemistry
What is the correct configuration of C2 and C3 carbons in the following compound? [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
The E/Z-nomenclature for the following molecules is: [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
The total number of stereoisomers possible for the given compound is:
ClCH2CH=CHCH=CHCH2CH3
PYP
2020 Paper - II Chemistry
Two compounds [X] and [Y] are given below: [IMAGE] The relationship between [X] and [Y] is:
[IMAGE]
PYP
2020 Paper - II Chemistry
Which one of the following is the most stable conformation of ethylene glycol? [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
Consider the following compound:
[IMAGE]
Which one of the following substrate sets is the best for synthesizing above compound?
[IMAGE]
PYP
2020 Paper - II Chemistry
The major product(s) formed in the following reaction is/are:
[IMAGE]
MeOH (1 equiv.) →
[IMAGE]
PYP
2020 Paper - II Chemistry
The relative order of reactivity of the following chlorides in SN1 reaction is: [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
The major product formed in the following reaction is: [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
The major product formed in the following reaction is:
Me Ph
H HO Me H
(i) TsCl, Py
(ii) NaOEt, EtOH
[IMAGE]
PYP
2020 Paper - II Chemistry
Which one of the following bromides CANNOT form an alkene by E2 process?
PYP
2020 Paper - II Chemistry
The major product formed in the following reaction is:
H3CH2C+N-CH3 OH CH2CH3 Δ
[IMAGE]
PYP
2020 Paper - II Chemistry
The major product formed in the following reaction is: [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
The major products [X] and [Y] formed in the following transformations are: [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
The major product formed in the reaction of 3-phenylpropene with HBr in the presence of peroxide is:
PYP
2020 Paper - II Chemistry
The major product formed in the following reaction is:
Ph\(\equiv\)Ph \(\xrightarrow[HgSO₄]{H₂O, H₂SO₄}\)
[IMAGE]
PYP
2020 Paper - II Chemistry
The major product formed in the reaction of N,N-dimethylaniline with concentrated H2SO4/HNO3 mixture is:
[IMAGE]
PYP
2020 Paper - II Chemistry
The major product formed in the following reaction is:
PhOTs with NaOEt in EtOH [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
The major product(s) formed in the following reaction is/are:
Bromobenzene with NaNH2 in NH3(liq) [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
Which one of the following reactions is NOT an example of ipso-substitution?
(a) [IMAGE]
(b) [IMAGE]
(c) [IMAGE]
(d) [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
The product formed by the reaction of toluene with chlorine in the presence of sunlight is:
PYP
2020 Paper - II Chemistry
The major product formed in the following reaction is:
[IMAGE]
PYP
2020 Paper - II Chemistry
The major product formed in the following reaction is:
[IMAGE]
PYP
2020 Paper - II Chemistry
The major product formed in the following reaction is: [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
The major product formed in the following reaction is: [IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
The major products [X] and [Y] formed in the following reactions are:
[IMAGE]
[IMAGE]
PYP
2020 Paper - II Chemistry
The relative order of the rate of acetolysis among the following norbornyl derivatives is:
[IMAGE]
[IMAGE]
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