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Chemistry · 2020

60 questions from this IIT JAM paper

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IIT JAM
Papers
2020
Chemistry

Chemistry · 2020

60 questions from this IIT JAM paper

Chemical Thermodynamics3 questions Organic Reaction Mechanism and Synthetic Applications10 questions Electrochemistry2 questions Natural Products Chemistry3 questions Basic Concepts and Stereochemistry8 questions Main Group Elements6 questions Chemical Bonding and Shapes of Molecules5 questions Chemical and Phase Equilibria3 questions Spectroscopy2 questions Determinants1 questions Gaseous State2 questions Transition Metals6 questions Bioinorganic Chemistry1 questions Chemical Kinetics1 questions Atomic and Molecular Structure2 questions Qualitative Organic Analysis1 questions Maxima and Minima1 questions Solid State1 questions Liquid State1 questions Ordinary Differential Equations1 questions

Q1.The graph that represents the temperature (T) – entropy (S) variation of a Carnot cycle is
Chemistry · Chemical Thermodynamics · MCQ
Q2.For the radical chain reaction below, the correct classification for step 2 and step 3 is, respectively, Step 1: $Br_{2} + M ⟶ 2 Br ∙ + M$ Step 2: $Br ∙ + H_{2} ⇌ HBr + H ∙$ …
Chemistry · Organic Reaction Mechanism and Synthetic Applications · MCQ
Q3.The salt bridge in a galvanic cell allows the flow of
Chemistry · Electrochemistry · MCQ
Q4.The nucleobase NOT found in DNA is
Chemistry · Natural Products Chemistry · MCQ
Q5.The correct statement for the following structures is 1 2 3 Includes diagram
Chemistry · Basic Concepts and Stereochemistry · MCQ
Q6.The correct order of boiling points of compounds I–IV is I II III IV Includes diagram
Chemistry · Basic Concepts and Stereochemistry · MCQ
Q7.One of the products of the hydrolysis of calcium phosphide at 25° C is
Chemistry · Main Group Elements · MCQ
Q8.Treatment of formic acid with concentrated sulfuric acid gives
Chemistry · Organic Reaction Mechanism and Synthetic Applications · MCQ
Q9.The *d*-orbitals involved in the hybridization to form square planar and trigonal bipyramidal geometries are, respectively,
Chemistry · Chemical Bonding and Shapes of Molecules · MCQ
Q10.The amino acid with *R* configuration is
Chemistry · Natural Products Chemistry · MCQ
Q11.At constant pressure, the $μ - T$ diagram for a pure substance that sublimes is ( $s = solid$ , $l = liquid$ and $g = gas$ )
Chemistry · Chemical and Phase Equilibria · MCQ
Q12.The force constant for $H^{35} Cl$ and $D^{35} Cl$ are the same and both can be considered as harmonic oscillators. $H^{35} Cl$ has a fundamental vibrational transition at $2886 cm^{- 1}$ . The…
Chemistry · Spectroscopy · MCQ
Q13.The correct statement regarding the determinants (Det) of matrices $R$ , $S$ and $T$ is $R = 341253478 S = 253341478 T = 324457138$ …
Chemistry · Determinants · MCQ
Q14.The Boyle temperature ( $T_{B}$ ) is defined as the temperature at which the properties of a real gas coincide with those of an ideal gas in the low pressure limit. The graph that shows the pressure dependence of the compression…
Chemistry · Gaseous State · MCQ
Q15.The major product formed in the following reaction sequence is Includes diagram
Chemistry · Organic Reaction Mechanism and Synthetic Applications · MCQ
Q16.The geometries of the species $[Br_{3}]^{+}$ , $[Br_{3}]^{-}$ and $[BrF_{3}]$ are, respectively,
Chemistry · Chemical Bonding and Shapes of Molecules · MCQ
Q17.The cage – type structure adopted by boron hydride, $[B_{5} H_{11}]$ , is
Chemistry · Main Group Elements · MCQ
Q18.The order of the M–C bond strength in the following species is (Atomic number for Cr = 24, Mn = 25, Ti = 22, Co = 27) $[Cr (CO)_{6}] [Mn (CO)_{6}]^{+} [Ti (CO)_{6}]^{2 -} [Co (CO)_{4}]^{-}$ …
Chemistry · Transition Metals · MCQ
Q19.The number of non-bonding electrons present in the frontier molecular orbitals of HF is
Chemistry · Chemical Bonding and Shapes of Molecules · MCQ
Q20.The coordination number of aluminum ion and the number of bridging hydrogen atoms in [Al(BH₄)₄]⁻ are, respectively,
Chemistry · Main Group Elements · MCQ
Q21.The complex which does NOT obey 18-electron rule is (atomic number for Mn = 25, Fe = 26, Co = 27, Ru = 44)
Chemistry · Transition Metals · MCQ
Q22.The solid state structure of HF is
Chemistry · Chemical Bonding and Shapes of Molecules · MCQ
Q23.The number of $d - d$ transition(s) expected for the complex $[Cu (NH_{3})_{2} (H_{2} O)_{4}]^{2 +}$ is
Chemistry · Transition Metals · MCQ
Q24.The plot showing the magnetic behavior of oxy- (solid line) and deoxy-haemoglobin (dashed line) is ( $χ_{M}$ = molar magnetic susceptibility, $T$ = temperature)
Chemistry · Bioinorganic Chemistry · MCQ
Q25.The major product formed in the following reaction is Includes diagram
Chemistry · Organic Reaction Mechanism and Synthetic Applications · MCQ
Q26.The rate of solvolysis of I–IV follows Includes diagram
Chemistry · Organic Reaction Mechanism and Synthetic Applications · MCQ
Q27.The more stable species in each pair of conformers are Includes diagram
Chemistry · Basic Concepts and Stereochemistry · MCQ
Q28.The major product formed in the following reaction sequence is Includes diagram
Chemistry · Organic Reaction Mechanism and Synthetic Applications · MCQ
Q29.For the Diels-Alder reactions I–IV, the activation barriers follow the order Includes diagram
Chemistry · Organic Reaction Mechanism and Synthetic Applications · MCQ
Q30.The major product formed in the following reaction is Includes diagram
Chemistry · Organic Reaction Mechanism and Synthetic Applications · MCQ
Q31.For the reaction shown in Scheme 1, the concentration profiles of different species are provided. Based on this graph, the correct condition(s) regarding the rate constants is(are) Includes diagram
Chemistry · Chemical Kinetics · Multiple correct
Q32. $ψ (x, y, z)$ describes the wavefunction of a particle. The probability of finding the particle between $x$ and $x + d x$ , $y$ and $y + d y$ , $z$ and $z + d z$ , can be expressed as
Chemistry · Atomic and Molecular Structure · Multiple correct
Q33.In water, the enthalpy of a protein in its folded state ( $H_{F}$ ) is lower than that in its unfolded state ( $H_{UF}$ ). The entropies of the folded and unfolded states are $S_{F}$ and $S_{UF}$ ,…
Chemistry · Chemical Thermodynamics · Multiple correct
Q34.The soft Lewis base(s) is(are)
Chemistry · Chemical Bonding and Shapes of Molecules · Multiple correct
Q35.The boron adduct(s), which show(s) three signals in ¹H NMR spectrum with the intensity ratio 1:2:3 is(are)
Chemistry · Main Group Elements · Multiple correct
Q36.The transition metal complex(es) with zero magnetic moment, zero dipole moment and CFSE of -2.4 Δ₀ is(are)
Chemistry · Transition Metals · Multiple correct
Q37.Achiral stereoisomer(s) is(are) possible for
Chemistry · Basic Concepts and Stereochemistry · Multiple correct
Q38.The compound(s) which will have only two signals in the ¹H NMR spectrum in 3:2 ratio is(are)
Chemistry · Qualitative Organic Analysis · Multiple correct
Q39.The correct sequence of reactions for the synthesis of the following molecule is(are) Includes diagram
Chemistry · Organic Reaction Mechanism and Synthetic Applications · Multiple correct
Q40.The organometallic reagent(s) among the following is(are)
Chemistry · Organic Reaction Mechanism and Synthetic Applications · Multiple correct
Q41.The function $x^{4} e^{- 2 x /3}$ (for $x > 0$ ) has a maximum at a value of $x$ equal to (Round off to two decimal places)
Chemistry · Maxima and Minima · Numerical
Q42.The longest wavelength of light absorbed by a hydrogen-like atom is 2.48 nm. The nuclear charge (Z) of the atom is (Round off to nearest integer) (Rydberg constant $R_{H} = 109700 cm^{- 1}$ )
Chemistry · Atomic and Molecular Structure · Numerical
Q43.Fullerene ( $C_{60}$ ) crystallizes in an FCC unit cell (edge length = 14.14 Å) with one $C_{60}$ centered at each lattice point. The smallest distance (in Å) between the centers of two $C_{60}$ molecules is …
Chemistry · Solid State · Numerical
Q44.A film of stearic acid partially covers the water surface in a container. The work needed to decrease this coverage by 1 cm $^{2}$ is $25.0 \times 1 0^{- 7}$ J. The surface tension (in N/m) of the film is (Round off…
Chemistry · Liquid State · Numerical
Q45.The value of ' $n$ ' in [ $P_{n} O_{18}$ ] $^{6 -}$ is
Chemistry · Main Group Elements · Numerical
Q46.The total number of all possible isomers of [ $Co (H_{2} NCH_{2} CH_{2} NH_{2})_{2} Cl_{2}$ ] $^{+}$ and [ $Co (H_{2} NCH_{2} CH_{2} NH_{2})_{3}$ ] $^{3 +}$ together is
Chemistry · Transition Metals · Numerical
Q47.The number of lone pairs present in phosphonic acid (phosphorus acid) is
Chemistry · Main Group Elements · Numerical
Q48.Total number of constitutional isomers possible for trimethyl cyclohexane is
Chemistry · Basic Concepts and Stereochemistry · Numerical
Q49.The dihedral (torsional) angle (in degrees) between the two methyl groups in the most stable conformation of $n$ -butane is (Round off to nearest integer)
Chemistry · Basic Concepts and Stereochemistry · Numerical
Q50.The degree of unsaturation (double bond equivalent) for a compound with molecular formula C₁₄H₁₂O₂ is
Chemistry · Basic Concepts and Stereochemistry · Numerical
Q51.The heat of formation of MgO at 300 K and 1 bar pressure is –600.60 kJ mol⁻¹. The free energy (in kJ mol⁻¹) of formation of MgO at 280 K is (Round off to nearest integer) Given: In the range 280-300 K, the…
Chemistry · Chemical Thermodynamics · Numerical
Q52.Sea water containing 1 M NaCl has to be desalinated at 300 K using a membrane permeable only to water. The minimum pressure (in bars) required on the sea-water side of the membrane is (Round off to one decimal…
Chemistry · Chemical and Phase Equilibria · Numerical
Q53.A bacterial colony grows via cell division where each mother bacterium independently produces two daughter cells in 20 minutes. If the concentration of bacteria is 10⁴ cm⁻³, the colony becomes harmful. Starting from a colony with an…
Chemistry · Ordinary Differential Equations · Numerical
Q54.The Maxwell distribution of speeds of a gas at 300 K is given below The molar mass (in g mol⁻¹) of this gas is (Round off to one decimal place) (R = 8.3 J mol⁻¹ K⁻¹) Includes diagram
Chemistry · Gaseous State · Numerical
Q55.At a certain wavelength, liquid P transmits 70%, whereas liquid Q transmits 30% of the incident light when separately placed in a spectrophotometric cell (path length = 1 cm). In a binary mixture of liquids P and Q (assume non-interacting…
Chemistry · Spectroscopy · Numerical
Q56.The mean ionic activity coefficient for a 0.01 M aqueous solution of Ca₃(PO₄)₂ is (Round off to three decimal places) (Given: log₁₀ γ± = - 0.509 z₊|z₋|√I )
Chemistry · Chemical and Phase Equilibria · Numerical
Q57.For the reaction, CuSO₄(aq) + Zn(s) → ZnSO₄(aq) + Cu(s), the value of ΔG° (in kJ mol⁻¹) is (Round off to the nearest integer) (Reduction potential: Cu²⁺(aq)/Cu(s) = + 0.34 V; Zn²⁺(aq)/Zn(s) = - 0.76 V) (Faraday…
Chemistry · Electrochemistry · Numerical
Q58.Titanium tetrachloride (TiCl₄) reacts with THF to form an octahedral complex X under inert atmosphere at 25 °C. If 5.0 g of TiCl₄ is used and the yield is 80%, the amount of X (in grams) formed is (Round off to…
Chemistry · Transition Metals · Numerical
Q59.The total number of tautomers possible for I and II together is I II Includes diagram
Chemistry · Basic Concepts and Stereochemistry · Numerical
Q60.The total number of head to tail isoprene linkages in the following molecule is Includes diagram
Chemistry · Natural Products Chemistry · Numerical