JEE Main questions
34495 published questions with worked solutions.
- The electric field of an electromagnetic wave in free space is E = 57 [7.5 10^6 t - 5 10^ -3 (3x+4y)](4 i -3 j ) N/C. The...
- A positive ion A and a negative ion B has charges 6.67 10^ -19 C and 9.6 10^ -10 C, and masses 19.2 10^ -27 kg and 9 10^ -27 kg...
- An ideal gas initially at 0ºC temperature, is compressed suddenly to one fourth of its volume. If the ratio of specific heat at...
- A force f = x^2y i +y^2 j acts on a particle in a plane x + y = 10. The work done by this force during a displacement from (0, 0)...
- The element that does not belong to the same period of the remaining elements (modern periodic table) is:
- Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for...
- Match the LIST-I with LIST-II List-I (Name reaction): (A) Swarts reaction (B) Sandmeyer's reaction (C) Wurtz Fittig reaction (D)...
- 2.8 10^ -3 mol of CO2 is left after removing 10^ 21 molecules from its 'x' mg sample. The mass of CO2 taken initially is Given :...
- The major product of the following reaction is : CH_3CH_2CH=O [ reflux ] excess HCHO, alkali ?
- Propane molecule on chlorination under photochemical condition gives two di-chloro products, "x" and "y". Amongst "x" and "y",...
- What amount of bromine will be required to convert 2 g of phenol into 2, 4, 6-tribromophenol ? (Given molar mass in g mol⁻¹ of C,...
- The correct set of ions (aqueous solution) with same colour from the following is :
- Given below are two statements : Statement I : In Lassaigne's test, the covalent organic molecules are transformed into ionic...
- Which of the following happens when NH4OH is added gradually to the solution containing 1M A²⁺ and 1M B³⁺ ions ? Given : K_ sp...
- Match the LIST-I with LIST-II List-I (Classification of molecules based on octet rule): (A) Molecules obeying octet rule (B)...
- If 1 mM solution of ethylamine produces pH = 9, then the ionization constant (Kb) of ethylamine is 10^ -x . The value of x is...
- For the thermal decomposition of N_2O_5(g) at constant volume, the following table can be formed, for the reaction mentioned...
- The standard enthalpy and standard entropy of decomposition of N2O4 to NO2 are 55.0 kJ mol⁻¹ and 175.0 J/K/mol respectively. The...
- Let a = i + 2 j + 3 k , b = 3 i + j - k and c be three vectors such that c is coplanar with a and b . If the vector c is...
- In I(m, n) = _0^1 x^ m-1 (1-x)^ n-1 dx, m, n > 0, then I(9, 14) + I(10, 13) is