JEE Main questions
34495 published questions with worked solutions.
- The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale and upto one decimal point). The CORRECT...
- Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number: Eu-63, Gd-64, Dy-66,...
- Consider the metal complexes [Ni(en)₃]²⁺ (A), [NiCl₄]²⁻ (B) and [Ni(NH₃)₆]²⁺ (C). Choose the CORRECT option by considering the...
- Consider the following molecules/species: (x) tropone, (y) acetone, (z) acetate ion. The correct order of carbon–oxygen double...
- Consider |x| is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with...
- The following two wedge–dash structures of a carbon bearing Br, Cl, Me and CH₃ are:
- The descending order of acidity among the following compounds is: A. Phenol, B. 4-nitrophenol, C. 4-methoxyphenol, D....
- The strongest conjugate acid will result from:
- A D-aldotetrose on oxidation with concentrated HNO₃ resulted in optically inactive dicarboxylic acid. The structure of the...
- Among Fe³⁺, Pb²⁺, Cu²⁺ and Mn²⁺, identify the one that gets precipitated out while passing H₂S in presence of NH₄OH as group...
- Match the LIST-I with LIST-II List-I (Compound): A. Cyclohexanol, B. Cyclohexylamine, C. Cyclohexanecarbaldehyde, D. Phenol...
- If 3.365 g of ethanol (l) is burnt completely in a bomb calorimeter at 298.15 K, the heat produced is 99.472 kJ. The |ΔH_f°| of...
- For the following reaction at 50°C and at 2 atm pressure, 2N₂O₅(g) ⇌ 2N₂O₄(g) + O₂(g), N₂O₅ is 50% dissociated. The magnitude of...
- An electrochemical cell, consist of the following two redox couples, Mˣ⁺(aq)/M(s) [E°red=+0.15 V] and Fe³⁺(aq)/Fe(s)...
- For a first order reaction A → B: | t/min | [A]/M | |---|---| | 0 | 0.6500 | | x | 0.0650 | | 20 | 0.00065 | x = _______ min....
- Let α, β be the roots of the equation x²−x+p=0 and γ, δ be the roots of the equation x²−4x+q=0; p,q∈ℤ. If α, β, γ, δ are in G.P.,...
- Let z₁,z₂∈ℂ be the distinct solutions of the equation z²+4z−(1+12i)=0. Then |z₁|²+|z₂|² is equal to:
- If f : ℕ → ℤ is defined by f(n)= vmatrix n & -1 & -5 -2n^2 & 3(2k+1) & 2k+1 -3n^3 & 3k(2k+1) & 3k(k+2)+1 vmatrix , k∈ℕ, and _ n=1...
- Let M be a 3×3 matrix such that M pmatrix 1 0 0 pmatrix = pmatrix 1 2 3 pmatrix , M pmatrix 0 1 0 pmatrix = pmatrix 0 1 2 pmatrix...
- Let A₁,A₂,A₃,…,A₃₉ be 39 arithmetic means between the numbers 59 and 159. Then the mean of A₂₅, A₂₈, A₃₁ and A₃₆ is equal to: