List of top Chemistry Questions asked in JEE Main

Which one of the following statements is not true about enzymes?

The hybridisations of the atomic orbitals of nitrogen in \(\mathrm{NO_2^-}\), \(\mathrm{NO_2^+}\) and \(\mathrm{NH_4^+}\) respectively are.

Major product P of above reaction, is :

Which one of the following species doesn't have a magnetic moment of 1.73 BM, (spin only value)?

Metallic sodium does not react normally with :

Outermost electronic configuration of a group 13 element, E, is \(4s^2, 4p^1\). The electronic configuration of an element of p-block period-five placed diagonally to element, E is :

The major product (P) in the following reaction is :

Spin only magnetic moment of an octahedral complex of \(\mathrm{Fe^{2+}}\) in the presence of a strong field ligand in BM is :

A solution is 0.1 M in \(\mathrm{Cl^-}\) and 0.001 M in \(\mathrm{CrO_4^{2-}}\). Solid \(\mathrm{AgNO_3}\) is gradually added to it. Assuming that the addition does not change in volume and \(K_{sp}(\mathrm{AgCl}) = 1.7\times10^{-10}\ \mathrm{M^2}\) and \(K_{sp}(\mathrm{Ag_2CrO_4}) = 1.9\times10^{-12}\ \mathrm{M^3}\).
Select correct statement from the following :

Which one of the following pairs of isomers is an example of metamerism?

At \(20^\circ\) C, the vapour pressure of benzene is 70 torr and that of methyl benzene is 20 torr. The mole fraction of benzene in the vapour phase at \(20^\circ\) above an equimolar mixture of benzene and methyl benzene is _____________ \(\times 10^{-2}\). (Nearest integer)

The inactivation rate of a viral preparation is proportional to the amount of virus. In the first minute after preparation, 10% of the virus is inactivated. The rate constant for viral inactivation is ___________ \(\times 10^{-3}\) \(\mathrm{min^{-1}}\). (Nearest integer)

[Use : \(\ln 10 = 2.303\); \(\log_{10} 3 = 0.477\); property of logarithm : \(\log x^y = y \log x\)]

To synthesize 1.0 mole of 2-methylpropan-2-ol from Ethylethanoate ___________ equivalents of \(\mathrm{CH_3MgBr}\) Reagent will be required. (Integer value)

The Azimuthal quantum number for the valence electrons of \(\mathrm{Ga^+}\) ion is ___________.

(Atomic number of Ga = 31)

The number of nitrogen atoms in a semicarbazone molecule of acetone is ______________.

250 mL of 0.5 M NaOH was added to 500 mL of 1 M HCl. The number of unreacted HCl molecules in the solution after complete reaction is ___________ \(\times\) \(10^{21}\). (Nearest integer)

(\(N_A = 6.022 \times 10^{23}\))

\(2\mathrm{SO_2(g)} + \mathrm{O_2(g)} \rightleftharpoons 2\mathrm{SO_3(g)}\)

In an equilibrium mixture, the partial pressures are

\(P_{\mathrm{SO_3}} = 43\) kPa; \(P_{\mathrm{O_2}} = 530\) Pa and \(P_{\mathrm{SO_2}} = 45\) kPa. The equilibrium constant \(K_P =\) ___________ \(\times 10^{-2}\). (Nearest integer)

The spin-only magnetic moment value for the complex \([\mathrm{Co(CN)_6}]^{4-}\) is __________ BM.

[At. no. of Co = 27]

The metal that can be purified economically by fractional distillation method is :

The conditions given below are in the context of observing Tyndall effect in colloidal solutions :

(A) The diameter of the colloidal particles is comparable to the wavelength of light used.

(B) The diameter of the colloidal particles is much smaller than the wavelength of light used.

(C) The diameter of the colloidal particles is much larger than the wavelength of light used.

(D) The refractive indices of the dispersed phase and the dispersion medium are comparable.

(E) The dispersed phase has a very different refractive index from the dispersion medium.

Choose the most appropriate conditions from the options given below :

The number of lone pairs of electrons on the central I atom in \(\mathrm{I_3^-}\) is ____________.

A s-block element (M) reacts with oxygen to form an oxide of the formula \(\mathrm{MO_2}\). The oxide is pale yellow in colour and paramagnetic. The element (M) is :

Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and \(\mathrm{P_4O_{10}}\) (in 4 : 1 ratio) is :

Green chemistry in day-to-day life is in the use of :

The set in which compounds have different nature is :