Practice/Question bank/JEE Main

JEE Main practice questions

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

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  1. 1Green chemistry means such reactions whichChemistry· Organic Chemistry· Easy
  2. 2Which one of the following aqueous solutions will exhibit highest boiling point?Chemistry· Physical Chemistry· Moderate
  3. 3The rate of chemisorptionChemistry· Physical Chemistry· Moderate
  4. 4In a first order reaction, the concentration of the reactant, decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the…Chemistry· Physical Chemistry· Moderate
  5. 5Select correct statement regarding silver extraction / purification process.Chemistry· Inorganic Chemistry· Moderate
  6. 6A Precipitate of PbSO4 is soluble inChemistry· Inorganic Chemistry· Moderate
  7. 7Which is/are correct for real gases?Chemistry· Physical Chemistry· Moderate
  8. 8Hydrogen peroxide in its reaction with KIO4 and NH2OH respectively, is acting as aChemistry· Inorganic Chemistry· Moderate
  9. 9Rate of the reaction is fastest when Z isChemistry· Organic Chemistry· Moderate
  10. 10Which of the following reactions will yield 2,2-dibromopropane ?Chemistry· Organic Chemistry· Tough· figure
  11. 11An enantiomerically pure acid is treated with racemic mixture of an alcohol having one chiral carbon. The ester formed will beChemistry· Physical Chemistry· Easy
  12. 12The presence or absence of hydroxy group on which carbon atom of sugar differentiates RNA and DNA.Chemistry· Organic Chemistry· Moderate
  13. 13Which one of the following statements regarding helium is incorrect?Chemistry· Physical Chemistry· Moderate
  14. 14In an atom, the total number of electrons having quantum numbers n = 4, $\left| m_{\mathcal{l}} \right| = 1$ and $m_{s} = - 1/2$ isChemistry· Physical Chemistry· Moderate
  15. 15The average velocity of gas molecules is 400 m/sec calculate its r.m.s. velocity at the same temperatureChemistry· Physical Chemistry· Easy / Moderate/ Tough t
  16. 16For the reaction: $C_{2}H_{5}OH(\mathcal{l}) + 3O_{2}(g) \longrightarrow 2{CO}_{2}(g) + 3H_{2}O(g)$ if $\Delta U^{o} = - 1373kJ{mol}^{- 1}$…Chemistry· Physical Chemistry· Easy / Moderate/ Tough m
  17. 17$A^{-}(g) \rightarrow A^{2 +}(g)$ $\Delta H = 1100\ KJ/mol$ $A(g) \rightarrow A^{2 +}(g)$ $\Delta H = 1200\ KJ/mol$ Electron gain enthalphy…Chemistry· Inorganic Chemistry· Moderate
  18. 18A solution of Na2CO3 is added drop by drop to one litre of a solution containing 10-4 mole of Ba2+ and 10-5 mole of Ag+. If Ksp for BaCO3…Chemistry· Physical Chemistry· Moderate
  19. 19How many isomeric alkynes on catalytic hydrogenation gives 3-Ethyl-4-methylheptane ?Chemistry· Organic Chemistry· Moderate· figure
  20. 20Copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom?Chemistry· Physical Chemistry· Moderate
  21. 21The Gibbs energy for the decomposition of ${Al}_{2}O_{3}$ at 500°C is as follows: $\frac{2}{3}{Al}_{2}O_{3} \rightarrow \frac{4}{3}Al +…Chemistry· Physical Chemistry· Moderate
  22. 22The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution isChemistry· Physical Chemistry· Moderate
  23. 23A radioactive element gets spilled over the floor of a room. Its half-life period is 30days. If the initial activity is ten times the…Chemistry· Physical Chemistry· Tough
  24. 24The number of geometric isomers that can exist for square planar [Pt (Cl) (py) $\left. \ \left( {NH}_{3} \right)\left( {NH}_{2}OH \right)…Chemistry· Inorganic Chemistry· Moderate· figure
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