JEE Main Chemistry Questionbank

The number of moles of oxygen atoms present in 0.5 mol of $H_2SO_4$ is:

Which set of quantum numbers is NOT permissible for an electron in an atom?

The mass of NaOH (molar mass 40 g/mol) required to prepare 500 mL of a 0.25 M aqueous solution is ______ g.

The hybridisation of each carbon atom in ethyne ($C_2H_2$) is:

For a real gas at moderate pressure and low temperature, a compressibility factor $Z < 1$ indicates that:

For $N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)$ at 300 K, $\Delta H = -92$ kJ/mol. The value of $\Delta U$ in kJ/mol, rounded to the nearest integer, is ______. ($R = 8.3$ J/K/mol)

For the equilibrium $N_2O_4(g) \rightleftharpoons 2NO_2(g)$, increasing the total pressure at constant temperature shifts the equilibrium:

The quantity of electricity (in coulombs) required to deposit one mole of aluminium from molten alumina is ______. (Use F = 96500 C/mol)

A first-order reaction has a rate constant $k = 6.93 \times 10^{-3}\ s^{-1}$. Its half-life in seconds is ______.

Equal molal aqueous solutions of urea, NaCl, K2SO4 and FeCl3 are prepared (assume complete dissociation). Which solution shows the highest elevation in boiling point?

Which of the following elements has the largest atomic radius?

Sodium imparts a golden-yellow colour to the Bunsen flame because:

The basicity of orthophosphorous acid ($H_3PO_3$) is:

The spin-only magnetic moment of $Fe^{3+}$ ($Z = 26$) in Bohr magnetons is ______. (Round to 2 decimals.)

The coordination number and oxidation state of cobalt in $[Co(NH_3)_4Cl_2]Cl$ respectively are:

A liquid that is immiscible with water but has appreciable vapour pressure near 373 K can be purified most suitably by:

Which of the following carbocations is the most stable?

Addition of HBr to propene gives predominantly:

Which alkyl bromide undergoes $S_N1$ solvolysis most rapidly?

Which of the following compounds gives a positive iodoform test?

In aqueous solution, which of the following is the strongest base?

Assertion: Glucose reacts with hydroxylamine to form an oxime.

Reason: The open-chain structure of glucose contains a free aldehyde group.

The de Broglie wavelength (in nm) of an electron moving at $10^6\ \mathrm{m/s}$ is ______. (Round to 1 decimal; use $h = 6.63 \times 10^{-34}\ \mathrm{J\ s}$ and $m_e = 9.1 \times 10^{-31}$ kg)

Which pair of species has the same bond order?

The oxidation state of sulphur in sulphuric acid ($H_2SO_4$) is: