Engineering Questions — Chemistry — Jee Main
160 solved questions with detailed explanations
Q.70. A salt with few drops of conc. HCl gives apple green colour in flame test. The group precipitate of the salt is dissolved in acetic acid and treated with K₂CrO₄ to give yellow precipitate. When
Q.60. The correct statements among the following are : A. Basic vanadium oxide is used in the manufacture of HSO. B. The spin-only magnetic moment value of the transition metal halide employed in Zieg
Q.66. Given below are two statements : Statement-I : The condensation reaction between and under optimum pH will produce . Statement-II : The molecule, [Figure: Molecule structure] will generate Ph–
Q.56. Consider the following data: (methane, g) = -X kJ mol Enthalpy of sublimation of graphite = Y kJ mol Dissociation enthalpy of H = Z kJ mol The bond enthalpy of C – H bond is given by:
Q.59. Given below are two statements : Statement-I : Aluminium is more electropositive than thallium as the standard electrode potential value of is negative and is positive. Statement-II: The sum o
Q.74. Identify the metal ions among Co²⁺, Ni²⁺, Fe²⁺, V³⁺ and Ti²⁺ having a spin-only magnetic moment value more than 3.0 BM. The sum of unpaired electrons present in the high spin octahedral complexe
Q.73. One mole of an alkane (x) requires 8 mole oxygen for complete combustion. Sum of number of carbon and hydrogen atoms in the alkane (x) is _________.
Q.52. Match List-I with List-II. List-I (Pair of Compounds) A. 2-Methylpropene and but-1-ene B. Cis-but-2-ene and trans-but-2-ene C. 2-Butanol and diethyl ether D. But-1-ene and but-2-ene List-II (Typ
Q.51. The correct order of total number of atoms of present in (A) 2 moles of cyclohexane (B) 684 g of sucrose (C) 90.8 L of dihydrogen at STP (1) C > A > B (2) C > B > A (3) B > C > A (4) B > A C
Q.64. The correct increasing order of C – H(A), C – O(B), C = O(C) and C N(D) bonds in terms of covalent bond length is:
Q.60. Given below are two statements : Statement (I): Oxidising power of halogens decreases in the order F > Cl > Br > I, which is the basis of "Layer test". Statement (II): "Layer test" to identify B
Q.70. On heating a mixture of common salt and K₂Cr₂O₇ in equal amount along with concentrated H₂SO₄ in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central meta
Q.62. Match List - I with List - II. List - I: Chromium (III) Complexes (en = ethylene diamine) A. [Cr(CN)₆]³⁻ B. [CrF₆]³⁻ C. [Cr(H₂O)₆]³⁺ D. [Cr(en)₃]³⁺ List - II: (cm⁻¹) I. 15,060 II. 17,400 III. 2
Q.62. The correct order of the rate of the reaction for the following reaction with respect to nucleophiles is: CHBr + Nu CHNu + Br
Q.66. Given below are two statements : Statement-I : Due to increase in van der Waals forces, the order of boiling points is . Statement-II: As [Figure: 1,4-dichlorobenzene] is more symmetric, its mel
Q.61. Consider the following molecules/species: [Figure: Three organic molecules labeled (x), (y), and (z). (x) is CH₃-C(=O)-CH₃ (acetone). (y) is CH₃-C(=O)-O⁻ (acetate ion). (z) is CH₃-C(=O)-H (aceta
Q.58. Consider the following data : Electrolyte | (S cm mol) BaCl | x HSO | x HCl | x BaSO is sparingly soluble in water. If the conductivity of the saturated BaSO solution is x S cm then the solubil
Q.75. At the transition temperature T, A B and where A and B are two states of substance X. The transition temperature in °C when pressure is 1 atm is _________ (Nearest integer)
Q.60. Given below are two statements : Statement-I : Presence of large number of unpaired electrons in transition metal atoms results in higher enthalpies of their atomisation. Statement-II : and ar
Q.63. Given below are two statements : Statement (I) : 1,2,3-Trihydroxypropane can be separated from water by simple distillation. Statement (II): An azeotropic mixture cannot be separated by fraction