JEE Main questions
34495 published questions with worked solutions.
- At 25°C, 20.0 mL of 0.2 M weak monoprotic acid HX is titrated against 0.2 M NaOH. The pH of the solution (a) at the start of the...
- Consider the reaction aX → bY, for which the rate constant at 30°C is 1 × 10⁻³ mol⁻¹ L s⁻¹. Which of the following statements are...
- The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is:
- Given below are two statements: Statement I: The second ionization enthalpy of B, Al and Ga is in the order of B > Al > Ga....
- Given below are two statements: Statement I: Among Zn, Mn, Sc and Cu, the energy required to remove the third valence electron is...
- Which of the following complexes will show coordination isomerism? A. [Ag(NH₃)₂][Ag(CN)₂] B. [Co(NH₃)₆][Cr(CN)₆] C....
- Complete combustion of X g of an organic compound gave 0.25 g of CO₂ and 0.12 g of H₂O. If the % of carbon is 25% and of hydrogen...
- Given below are two statements: Statement I: In O₂N-C₆H₄-CH⁺-C₆H₄-OCH₃, the carbocation is stabilised by +R effect of −OCH₃...
- The compound (X) on (i) on heating in the presence of anhydrous AlCl₃ and HCl gas gives 2,4-dimethylpentane and (ii)...
- Correct statements regarding alkyl halides (R−X) among the following are: A. Alcohol being less polar solvent as compared to...
- An organic compound "x" where molar ratio of C, O and H are equal, on treatment with 50% KOH under reflux followed by...
- A molecule (X) with structure CH₂=CH−CH₂−O−C(CH₃)=CH₂ (allyl isopropenyl ether) under mild acidic condition is hydrolysed to...
- Among Fe²⁺, Fe³⁺, Cr²⁺ and Zn²⁺, the ion that shows positive borax bead test and with highest ionisation enthalpy is:
- Consider the following two half-cell reactions along with the standard reduction potential given: CO₂ + 6H⁺ + 6e⁻ → CH₃OH + H₂O,...
- Number of paramagnetic ions among the following d- and f-block metal ions is _______. Mn²⁺, Cu²⁺, Zn²⁺, Yb²⁺, Sc³⁺, La³⁺, Gd³⁺,...
- Let α, α + 2, α ∈ ℤ, be the roots of the quadratic equation x(x + 2) + (x + 1)(x + 3) + (x + 2)(x + 4) + … + (x + n − 1)(x + n +...
- Let x and y be real numbers such that 50 ( 2x 1 + 3i - y 1 - 2i ) = 31 + 17i, i = √−1. Then the value of 10(x − 3y) is:
- Let α, β ∈ ℝ be such that the system of linear equations x + 2y + z = 5, 2x + y + αz = 5, 8x + 4y + βz = 18 has no solution. Then...
- Let A = bmatrix 1 & 2 1 & bmatrix and B = bmatrix 3 & 3 & 2 bmatrix . If A² − 4A + I = O and B² − 5B − 6I = O, then among the two...
- Let A be the set of first 101 terms of an A.P., whose first term is 1 and the common difference is 5 and let B be the set of...