Engineering Questions — Chemistry — JEE Main
160 solved questions with detailed explanations
Q.51. Match List-I with List-II. List-I Mass of substance A. 1.8 mg water B. 9.8 mg sulphuric acid C. 1.8 mg carbon D. 5.85 mg salt (NaCl) List-II Number of atoms I. 2 × 10⁻⁴ × N_A II. 1.5 × 10⁻⁴ × N_
Q.72. Consider the isomers of hydrocarbon with molecular formula C₈H₁₀. These isomers do not decolourise KMnO₄ solution. These isomers are subjected to chlorination with chlorine in presence of light
Q.56. When 0.25 moles of a non-volatile, non-ionizable solute was dissolved in 1 mole of a solvent the vapor pressure of solution was x% of vapor pressure of pure solvent. What is x% ?
Q.53. Bromine trifluoride autoionizes to form BrF and BrF. The shapes of the cation and anion are respectively _______ and _______.
Q.65. Complete the following reaction sequence and give the name of major product 'P'. (Major product)
Q.71. The first and second ionization constants of H₂X are and respectively. The concentration of X²⁻ in 0.1 M H₂X solution is M. (Nearest Integer)
Q.54. The pairs among A = [SO, CO], B = [O, F], C = [CN, CO], D = [NH, HO] and E = [MnO, CrO] that do not have similar Lewis dot structure are :
Q.71. 5.33 g of CrCl₃·6H₂O, which is a 1 : 3 electrolyte, is dissolved in water and is passed through a cation exchanger. The chloride ions in the eluted solution, on treatment with AgNO₃, results in
Q.56. The solubility product constants of AgCrO and AgBr are 32x and 4y respectively at 298 K. The value of can be expressed as :
Q.58. is the time required for the 100% completion of the reaction while is the time required for 50% of the reaction to be completed. Which of the following option correctly represents the relation
Q.73. 4.7 g of phenol is heated with Zn to give product X. If this reaction goes to 60% completion then the number of moles of compound X formed will be ______ 10 (Nearest Integer) (Given molar mass
Q.64. Given below are two statements : Statement (I) : Benzyl chloride reacts faster in S1 mechanism than ethyl chloride. Statement (II) : Ethyl carbocation intermediate is less stabilized by hypercon
Q.56. Match the LIST-I with LIST-II List-I Reaction A. Williamson Synthesis B. Friedel Craft Reaction C. Bromination of vinyl benzene D. Chlorination of toluene in light List-II Mechanism I. Electroph
Q.68. Arrange the following compounds according to increasing order of boiling points. n-CHOH (A), n-CHNH (B), n-CH (C) and CHNHCH (D).
Q.56. Given at 298 K: The in Volt at 298 K is given by :
Q.51. Match List-I with List-II. List-I (Mass of substance) A. 1.8 mg water B. 9.8 mg sulphuric acid C. 1.8 mg carbon D. 5.85 mg salt (NaCl) List-II (Number of atoms) I. II. III. IV. Choose the co
Q.65. Given below are four compounds: (a) n-propyl chloride (b) iso-propyl chloride (c) sec-butyl chloride (d) neo-pentyl chloride Percentage of carbon in the one which exhibits optical isomerism is:
Q.67. For a closed circuit Daniell cell, which of the following plots is the accurate one at a given temperature? [Figure: Four graphs of E°cell vs time]
Q.52. The species having identical radii according to the Bohr's theory are : A. H (first orbit) B. He (first orbit) C. He (second orbit) D. Li (first orbit) E. Be (Second orbit) Choose the correct an
Q.54. Which of the following are not correct? A. For water, magnitude of is more than the magnitude of . B. The elevation in boiling point of water when a non-volatile solute is added to it is larger