Engineering Questions — Chemistry
170 solved questions with detailed explanations
Q.53. Which of the following pictorial diagram most correctly represents the ( - antibonding) molecular orbital between two atoms if the internuclear axis is taken to be in the z-direction (z-axis )?
Q.70. Statement I: Sodium dichromate and potassium dichromate are classified as primary standard in titrimetric analysis. Statement II : Phenolphthalein is a weak base, therefore it dissociates in aci
Q.63. R value for 2-methylpropene in a solvent system (Ethyl acetate + ether) is 0.42. 2-methylpropene is treated with dilute HSO to give major organic product (X). R value for (X) in the same solvent
Q.53. The covalent radii of atoms A and B are r and r, respectively. The covalent bond length and total length of AB molecule are respectively :
Q.54. Consider the following data for the reaction at 600 K. The (in kJ mol⁻¹) for the reaction is: [Figure: Table with A/H600K and S600K values for XY(g), X2(g), Y2(g)]
Q.73. 20 g hemoglobin in a 1 L aqueous solution (A) at 300 K is separated from pure water by semi permeable membrane. At equilibrium the height of solution in a tube dipped in a solution (A) is found
Q.70. A paper dipped in a dil. HSO solution of 'X' upon treatment with SO gas turns into green. The compound 'X' is :
Q.59. The correct order of reactivity of the following benzyl halides towards reaction with KCN is: [Figure: Four benzyl halides are shown: (a) Benzyl bromide with -OH group at para position. (b) Benz
Q.63. Given below are two statements: Statement I: Crystal Field Stabilization Energy (CFSE) of [Cr(HO)] is greater than that of [Mn(HO)]. Statement II: Potassium ferricyanide has a greater spin-only
Q.59. Find the correct statements related to group 15 hydrides. A. Reducing nature increases from NH to BiH. B. Tendency to donate lone pair of electrons decreases from NH to BiH. C. The stability of
Q.63. The major product of which of the following reaction is not obtained by rearrangement reaction? [Figure: Four reaction schemes with reactants and products]
Q.68. Consider the three aromatic molecules (P, Q and R) whose structures have been given below : [Figure: Three aromatic molecules P, Q, R. P is 1,3,5-trimethylbenzene (mesitylene). Q is 1,2,4,5-tetr
Q.60. Given below are two statements : Statement I: The number of pairs among [Ti⁴⁺, V²⁺], [V³⁺, Mn²⁺], [Mn³⁺, Fe³⁺] and [V⁴⁺, Cr²⁺] in which both ions are coloured is 3. Statement II: The number pair
Q.55. Consider the following reactions in which all the reactants and products are present in gaseous state , , The value of for the equilibrium is :
Q.56. At , 20.0 mL of 0.2 M weak monoprotic acid HX is titrated against 0.2 M NaOH. The pH of the solution (a) at the start of the titration (when NaOH has not been added) and (b) when 10 mL of NaOH i
Q.74. At 298 K, the molar conductivity of x% (w/w) MX solution (aqueous) is 123.5 S cm mol. The conductance of same solution is S. The value of x is ______ . (Given : cell constant = 1.3 cm; molar ma
Q.57. An electrochemical cell is constructed using half cells in the direction of spontaneous change Fe(OH)(s) + 2e Fe(s) + 2OH(aq) E = -0.88V and AgBr(s) + e Ag(s) + Br(aq) E = +0.07V Which of the
Q.57. One half cell in a voltaic cell is constructed by dipping silver rod in solution of unknown concentration, other half cell is Zn rod dipped in 1 molar solution of . A voltage of 1.60 V is measu
Q.52. If shortest wavelength of hydrogen atom in Lyman series is x, then longest wavelength in Balmer series of He is :
Q.69. Match the List-I with List-II : List-I: Deficiency Disease (A) Scurvy (B) Convulsions (C) Cheilosis (D) Xerophthalmia List-II: Vitamin I. Pyridoxine II. Vitamin A III. Ascorbic Acid IV. Riboflav