202066 marks18 questions
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Source: JEE (Advanced) 2020, Paper 2, Chemistry, published by JEE (Advanced). The official PDF
In the chemical reaction between stoichiometric quantities of KMnO₄ and KI in weakly basic solution, what is the number of moles of I₂ released for 4 moles of KMnO₄ consumed?
An acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of 1 mL of 3% H₂O₂, a blue alcohol layer was obtained. The blue color is due to the formation of a chromium (VI) compound ‘X’. What is the number of oxygen atoms bonded to chromium through only single bonds in a molecule of X?
An organic compound (C₈H₁₀O₂) rotates plane-polarized light. It produces pink color with neutral FeCl₃ solution. What is the total number of all the possible isomers for this compound?
Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?
Choose the correct statement(s) among the following.
Liquids A and B form ideal solution for all compositions of A and B at 25 ℃. Two such solutions with 0.25 and 0.50 mole fractions of A have the total vapor pressures of 0.3 and 0.4 bar, respectively. What is the vapor pressure of pure liquid B in bar?
Tin is obtained from cassiterite by reduction with coke. Use the data given below to determine the minimum temperature (in K) at which the reduction of cassiterite by coke would take place. At 298 K: ∆fH⁰(SnO₂(s)) = −581.0 kJ mol⁻¹, ∆fH⁰(CO₂(g)) = −394.0 kJ mol⁻¹, S⁰(SnO₂(s)) = 56.0 J K⁻¹mol⁻¹, S⁰(Sn(s)) = 52.0 J K⁻¹mol⁻¹, S⁰(C(s)) = 6.0 J K⁻¹mol⁻¹, S⁰(CO₂(g)) = 210.0 J K⁻¹mol⁻¹. Assume that the enthalpies and the entropies are temperature independent.
An acidified solution of 0.05 M Zn²⁺ is saturated with 0.1 M H₂S. What is the minimum molar concentration (M) of H⁺ required to prevent the precipitation of ZnS? Use Ksp (ZnS) = 1.25 × 10⁻²² and overall dissociation constant of H₂S, KNET = K₁K₂ = 1 × 10⁻²¹.