JEE Main questions
34495 published questions with worked solutions.
- The wavelength of the carrier waves in a modern optical fiber communication network is close to:
- The lanthanide ion that would show colour is:
- Given that E^ _ O_2/H_2O = +1.23 V; E^ _ S_2O_8^ 2- /SO_4^ 2- = 2.05 V; E^ _ Br_2/Br^- = +1.09 V; E^ _ Au^ 3+ /Au = +1.4 V. The...
- The size of the iso-electronic species Cl^-, Ar and Ca^ 2+ is affected by:
- The correct order of hydration enthalpies of alkali metal ions is:
- Diborane (B_2H_6) reacts independently with O_2 and H_2O to produce, respectively:
- The quantum numbers of four electrons are given below: I. n = 4, l = 2, m_l = −2, m_s = - 12 II. n = 3, l = 2, m_l = 1, m_s = +...
- In order to oxidise a mixture of one mole of each of FeC_2O_4, Fe_2(C_2O_4)_3, FeSO_4 and Fe_2(SO_4)_3 in acidic medium, the...
- Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes...
- The vapour pressures of pure liquids A and B are 400 and 600 mmHg, respectively at 298 K. On mixing the two liquids, the sum of...
- The correct order of the spin-only magnetic moment of metal ions in the following low spin complexes, [V(CN)_6]^ 4- , [Fe(CN)_6]^...
- In the following compounds, the decreasing order of basic strength will be:
- Assertion: Ozone is destroyed by CFCs in the upper stratosphere. Reason: Ozone holes increase the amount of UV radiation reaching...
- For the reaction 2A + B → C, the values of initial rate at different reactant concentrations are given in the table below. The...
- If solubility product of Zr_3(PO_4)_4 is denoted by K_ sp and its molar solubility is denoted by S, then which of the following...
- For silver, C_p (JK^ -1 mol^ -1 ) = 23 + 0.01 T. If the temperature (T) of 3 moles of silver is raised from 300 K to 1000 K at 1...
- Maltose on treatment with dilute HCl gives:
- Which of the following amines can be prepared by Gabriel phthalimide reaction?
- 5x 2 x 2 ,dx is equal to (where c is a constant of integration)
- The equation of a plane containing the line of intersection of the planes 2x - y - 4 = 0 and y + 2z - 4 = 0 and passing through...