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Some Basic Concepts of Chemistry

18 questions · Chemistry · JEE Advanced
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Some Basic Concepts of Chemistry

18 questions · Chemistry · JEE Advanced

  1. The stoichiometric reaction of 516 g of dimethyldichlorosilane with water results in a tetrameric cyclic product X in 75% yield. The weight (in g) of X obtained is ​. [Use,…2023 · Shift 1 · Q8 · Numerical
  2. H2​S(5 moles) reacts completely with acidified aqueous potassium permanganate solution. In this reaction, the number of moles of water produced is x, and the number of moles of electrons involved is y…2023 · Shift 2 · Q8 · Numerical
  3. The treatment of an aqueous solution of 3.74 g of Cu(NO3​)2​ with excess KI results in a brown solution along with the formation of a precipitate. Passing H2​ S through…2022 · Shift 1 · Q4 · Numerical
  4. To check the principle of multiple proportions, a series of pure binary compounds (Pm​Qn​) were analyzed and their composition is tabulated below. The correct option(s) is(are) Includes table2022 · Shift 2 · Q9 · Multiple correct
  5. 5.00 mL of 0.10 M oxalic acid solution taken in a conical flask is titrated against NaOH from a burette using phenolphthalein indicator. The volume of NaOH required for the appearance of permanent faint pink color is tabulated below for… Includes table2020 · Shift 1 · Q13 · Numerical
  6. 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?2020 · Shift 2 · Q3 · Numerical
  7. The mole fraction of urea in an aqueous urea solution containing 900 g of water is 0.05. If the density of the solution is 1.2 g cm − 3, then molarity of urea solution is ................ (Given data : Molar masses of urea and water are…2019 · Shift 2 · Q10 · Numerical
  8. The amount of water produced (in g) in the oxidation of 1 mole of rhombic sulphur by conc. HNO3​ to a compound with the highest oxidation state of sulphur is .............. (Given data : Molar mass of water = 18 g mol − 1)2019 · Shift 2 · Q13 · Numerical
  9. To measure the quantity of MnCl2​ dissolved in an aqueous solution, it was completely converted to KMnO4​ using the reaction, MnCl2​+K2​S2​O8​+H2​O→KMnO4​+H2​SO4​+HCl(equation not balanced). Few…2018 · Shift 2 · Q6 · Numerical
  10. A compound H2​X with molar weight of 80g is dissolved in a solvent having density of 0.4 gml–1 . Assuming no change in volume upon dissolution, the molality of a 3.2 molar solution is2014 · Shift 1 · Q3 · Numerical
  11. If the value of Avogadro number is 6.023 × 1023 mol-1 and the value of Boltzmann constant is 1.380 × 10-23 J K-1, then the number of significant digits in the calculated value of the universal gas constant is2014 · Shift 1 · Q7 · Numerical
  12. 29.2 % (w/w) HCl stock solution has density of 1.25 g mL-1 . The molecular weight of HCl is 36.5 g mol-1 . The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is2012 · Shift 1 · Q3 · Numerical
  13. Dissolving 120 g of urea (mol. wt. 60) in 1000 g of water gave a solution of density 1.15 g/mL. The molarity of the solution is2011 · Shift 1 · Q6 · MCQ
  14. The volume (in mL) of 0.1 M AgNO3​ required for complete precipitation of chloride ions present in 30 mL of 0.01 M solution of [Cr(H2​O)5​Cl]Cl2​, as silver chloride is close to ​.2011 · Shift 2 · Q18 · Numerical
  15. A student performs a titration with different burettes and finds titre values of 25.2 mL, 25.25 mL, and 25.0 mL. The number of significant figures in the average titre value is2010 · Shift 1 · Q14 · Numerical
  16. Silver (atomic weight = 108 g mol-1) has a density of 10.5 g.cm-3. The number of silver atoms on a surface of area 10-12 m2 can be expressed in scientific notation as y × 10x. The value of x is?2010 · Shift 2 · Q2 · Numerical
  17. Given that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5%, respectively, the atomic mass of Fe is :2009 · Shift 1 · Q2 · MCQ
  18. Consider a titration of potassium dichromate solution with acidified Mohr’s salt solution using diphenylamine as indicator. The number of moles of Mohr’s salt required per mole of dichromate is2007 · Shift 2 · Q1 · MCQ