Engineering Questions — Chemistry
170 solved questions with detailed explanations
Q.68. Which statements are True? A. In Hoffmann bromamide degradation, 4 moles of NaOH and 2 moles of Br₂ are consumed per mole of an amide B. Hoffmann bromamide reaction is not given by alkyl amides.
Q.62. Consider |x| is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with x number of unpaired electrons from the following are: A. Sc³⁺ B
Q.57. The 1st ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the 2nd ionization enthalpy of Mg is ______.
Q.64. Identify the correct IUPAC name of hydrocarbon (x) containing three primary carbon atoms and with molar mass 72 g mol⁻¹.
Q.53. is isostructural with : Choose the correct answer from the options given below:
Q.60. Given below are two statements : Statement I: The number of pairs among [Ti, V], [V, Mn], [Mn, Fe] and [V, Cr] in which both ions are coloured is 3. Statement II: The number pairs among [La, Yb]
Q.57. Match List-I with List-II. List-I (Reagents) A. H, Pd-BaSO B. SnCl, HCl C. CrOCl, CS D. CO, HCl, Anhyd. AlCl List-II (Reaction Name (Involving aldehydes)) I. Etard Reaction II. Rosenmund Reducti
Q.51. The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1. It has two carbon atoms. The weight (in g) of formed when 3.38 g of this hydrocarbon is completely burnt in oxygen is : (
Q.55. 20 mL of a solution of acetic acid required 28.4 mL of 0.1 M NaOH for its neutralization. A solution (X) was prepared by mixing 20 mL of the above acetic acid and 14.2 mL of 0.1 M NaOH solution.
Q.59. Find the correct statements related to group 15 hydrides. A. Reducing nature increases from NH₃ to BiH₃ B. Tendency to donate lone pair of electrons decreases from NH₃ to BiH₃ C. The stability o
Q.69. Among Fe³⁺, Pb²⁺, Cu²⁺ and Mn²⁺, identify the one that gets precipitated out while passing H₂S in presence of NH₄OH as group reagent. The highest possible oxidation state of the corresponding me
Q.64. Given below are two statements : Statement-I : 2, 6-diethylcyclohexanone and 6-methyl-2-n-propylcyclohexanone are metamers. Statement-II: 2, 2, 6, 6-tetramethylcyclohexanone exhibits keto-enol t
Q.51. An oxide of iron contains 69.9% iron, its empirical formula, is: (Given : Molar mass of Fe and O are 56 and 16 g mol respectively.)
Q.60. Consider the metal complexes [Ni(en)] (A), [NiCl] (B) and [Ni(NH)] (C). Choose the CORRECT option by considering the number of unpaired electron present in (A), (B) and (C) respectively and the
Q.52. The first and second ionization constants of a weak dibasic acid are and respectively. 0.1 mol of was dissolved in 1L of 0.1 M HCl solution. The concentration of in the resultant solution i
Q.66. Given below are two statements : Statement-I : 3-phenylpropene reacts with HBr and gives secondary alkyl bromide having a chiral carbon atom as the major product. Statement-II: Aryl chlorides an
Q.69. Given below are two statements : Statement-I : [Figure: Glucose anomers] are two anomers of D-(+)-glucose. Statement-II : The open chain forms of D-glucose and D-fructose contain three similar c
Q.71. If 3.365 g of ethanol (l) burnt completely in a bomb calorimeter at 298.15K, the heat produced is 99.472 kJ. The |ΔH| of ethanol at 298.15 K is ______ × 10² kJ mol⁻¹. (Nearest integer) Given : S
Q.62. Given below are two statements : Statement I: Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation. Statemen
Q.74. Sucrose hydrolyses in acidic medium into glucose and fructose by first order rate law with t = 3 hour. The percentage of sucrose remaining after 6 hours is ______ (Nearest integer) (Given: log 2