List of top Chemistry Questions asked in JEE Main

For any given series of spectral lines of atomic hydrogen, let \(\Delta\bar{\nu} = \Delta\bar{\nu}_{max} - \Delta\bar{\nu}_{min}\) be the difference in maximum and minimum frequencies in \(\mathrm{cm^{-1}}\). The ratio \(\dfrac{\Delta\bar{\nu}_{Lyman}}{\Delta\bar{\nu}_{Balmer}}\) is :

The standard Gibbs energy for the given cell reaction in kJ mol^-1 at 298 K is :
\(\mathrm{Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)}\),
\(E^\circ = 2\ \mathrm{V}\) at 298 K
(Faraday's constant, \(F = 96000\ \mathrm{C\ mol^{-1}}\))

The major product of the following reaction is :

The given plots represent the variation of the concentration of a reactant R with time for two different reactions (i) and (ii). The respective orders of the reactions are :

The organic compound that gives following qualitative analysis is :

	Test	Inference
(a)	Dil. HCl	Insoluble
(b)	NaOH solution	soluble
(c)	\(\mathrm{Br_2}\)/water	Decolourization

Which of the following statements is not true about sucrose?

Among the following, the molecule expected to be stabilized by anion formation is :
\(\mathrm{C_2,\ O_2,\ NO,\ F_2}\)

The degenerate orbitals of \([\mathrm{Cr(H_2O)_6}]^{3+}\) are :

The major product of the following reaction is :
\(\mathrm{CH_3CH=CHCO_2CH_3}\ \xrightarrow{\ \mathrm{LiAlH_4}\ }\ ?\)

The major product of the following reaction is :

Liquid 'M' and liquid 'N' form an ideal solution. The vapour pressures of pure liquids 'M' and 'N' are 450 and 700 mmHg, respectively, at the same temperature. Then correct statement is:
(\(x_M\) = Mole fraction of 'M' in solution ;
\(x_N\) = Mole fraction of 'N' in solution ;
\(y_M\) = Mole fraction of 'M' in vapour phase ;
\(y_N\) = Mole fraction of 'N' in vapour phase)

0.27 g of a long chain fatty acid was dissolved in 100 cm³ of hexane. 10 mL of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch glass is 10 cm. What is the height of the monolayer?
[Density of fatty acid = 0.9 g cm^–3, \(\pi\) = 3]

Polysubstitution is a major drawback in:

The major product in the following reaction is :

The major product of the following reaction is:

Which one of the following alkenes when treated with HCl yields majorly an anti Markovnikov product?

The major product obtained in the following reaction is

The ion that has \(sp^3d^2\) hybridization for the central atom, is :

The calculated spin-only magnetic moments (BM) of the anionic and cationic species of \(\mathrm{[Fe(H_2O)_6]^{2+}}\) and \(\mathrm{[Fe(CN)_6]^{4-}}\), respectively, are :

The major product of the following reaction is:

The correct statement about \(\mathrm{ICl_5}\) and \(\mathrm{ICl_4^-}\) is

The covalent alkaline earth metal halide (X = Cl, Br, I) is :

100 mL of a water sample contains 0.81 g of calcium bicrabonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of \(\mathrm{CaCO_3}\) is : (Molar mass of calcium bicarbonate is 162 g mol^-1 and magnesium bicarbonate is 146 g mol^-1)

Adsorption of a gas follows freundlich adosorbed isotherm. x is the mass of the gas adsorbed on mass m of the adsorbent. The plot \(\log \frac{x}{m}\) versus \(\log p\) is shown in the given graph. \(\frac{x}{m}\) is proportional to :

The major product of the following reaction is :