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JEE Main practice questions

NTA-style Physics, Chemistry and Maths MCQs with solutions. 2,688 questions in the bank.

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  1. 1Consider the following statements: A hydrocarbon of molecular formula C5H10 is a 1. monosubstituted alkene 2. disubstituted alkene 3.…Chemistry· Organic Chemistry· Moderate
  2. 2One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is n-butene. Find…Chemistry· Organic Chemistry· Moderate
  3. 3How many chiral compounds are possible on monochlorination of 2- methyl butane ? 2- esfFky C;wVsuChemistry· Organic Chemistry· Moderate· figure
  4. 4The major organic compound formed by the reaction of 1,1,1- trichloroethane with silver powder is ____-Butyne. cM+h ek=kkChemistry· Organic Chemistry· Moderate· figure
  5. 5The product formed in the reaction.. [IMAGE] is.Chemistry· Organic Chemistry· Moderate· figure
  6. 6The number of stereoisomers obtained by bromination of trans-2-butene is: Vªkal-2-C;wVhuChemistry· Organic Chemistry· Tough· figure
  7. 7JM-CH-25-Q4Chemistry· Organic Chemistry· Tough· figure
  8. 8Which of the following undergoes decarboxylation most readily on being heated ? nsrkChemistry· Organic Chemistry· Moderate
  9. 9But-2-ene can be obtained by electrolysis of an aqueous solution ofChemistry· Organic Chemistry· Moderate· figure
  10. 10Which acid will decarboxylate with greatest difficulty ?Chemistry· Organic Chemistry· Moderate
  11. 11Which of the following compounds on hydrolysis gives acetyleneChemistry· Organic Chemistry· Easy]· figure
  12. 12To prepare But-2-yne from 2, 2, 3, 3-Tetrachlorobutane, reagent used isChemistry· Organic Chemistry· Moderate· figure
  13. 13In the depression of freezing point experiment, it is found that: I. The vapour pressure of the solution is less than that of pure solvent.…Chemistry· Physical Chemistry· Moderate
  14. 14Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. This is due toChemistry· Inorganic Chemistry· Moderate
  15. 15What is the equilibrium constant expression for the reaction P4 (s) + 5O2 (g)[IMAGE] P4 O10 (s) ?Chemistry· Physical Chemistry· Moderate· figure
  16. 16Consider the reaction equilibrium 2SO_2 (g) + O_2 (g)[IMAGE] 2SO_3 (g); ΔHº = - 198 kJ. On the basis of Le Chatelier's principle, the…Chemistry· Physical Chemistry· Moderate· figure
  17. 17Phosphorus pentachloride dissociates as follows in a closed reaction vessel. PCl_5(g) [IMAGE] PCl_3(g) + Cl_2(g) If total pressure at…Chemistry· Physical Chemistry· Moderate· figure
  18. 18For the following three reactions a, b and c, equilibrium constants are given: fuEu rhu vfHkfØ;kvksa a, b rFkk c ds fy, mu fLFkjkad fn, x,…Chemistry· Physical Chemistry· Easy· figure
  19. 19The molar solubility (in mol L-1) of a sparingly soluble salt MX4 is s. The corresponding solubility product is Ksp.. s is given in terms…Chemistry· Moderate· figure
  20. 20When different types of salts have nearly same solubility product constants Ksp, but less than one, the most soluble salt is thatChemistry· Physical Chemistry· Moderate
  21. 21How many of the following relations are correct for the solubility product (Ksp) & solubility (s g/litre) of sparingly soluble salt A3B2…Chemistry· Physical Chemistry· Tough· figure
  22. 22The Corey-House alkane synthesis is carried out by treating an alkyl halide withChemistry· Organic Chemistry· Moderate· figure
  23. 23When ethyl chloride and n-propyl chloride undergoes wurtz reaction which is not obtainedChemistry· Organic Chemistry· Moderate· figure
  24. 24The freezing point (in ºC) of a solution containing 0.1 g of K3[Fe(CN)6] (Mol. Wt. 329) in 100 g of water (Kf = 1.86 K kg mol-1) is: 100 g…Chemistry· Physical Chemistry· Moderate
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