JEE Main 2021 (Online) 25th February Morning Shift

Compound(s) which will liberate carbon dioxide with sodium bicarbonate solution is/are :

The major product of the following chemical reaction is :

Which one of the following reactions will not form acetaldehyde?

Using the provided information in the following paper chromatogram :Fig : Paper chromatography for compounds A and B.the calculated Rf value of A ________\(\times\) 10-1.

Which of the glycosidic linkage between galactose and glucose is present in lactose?

According to molecular orbital theory, the species among the following that does not exist is :

Among the following, the number of halide(s) which is/are inert to hydrolysis is _________.(A) BF3(B) SiCl4(C) PCl5(D) SF6

For the reaction, aA + bB \(\to\) cC + dD, the plot of log k vs \({1 \over T}\) is given below :The temperature at which the rate constant of the reaction is 10-4 s-1 is _________ K. (Rounded off to the nearest integer)[Given : The rate c...

Which of the following reaction/s will not give p-aminoazobenzene?

The hybridization and magnetic nature of \({[Mn{(CN)_6}]^{4 - }}\) and \({[Fe{(CN)_6}]^{3 - }}\), respectively are :

In which of the following pairs, the outer most electronic configuration will be the same?

Given below are two statements :Statement I : CeO2 can be used for oxidation of aldehydes and ketones.Statement II : Aqueous solution of EuSO4 is a strong reducing agent.In the light of the above statements, choose the correct answer from t...

Given below are two statements :Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog.Statement II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formati...

A car tyre is filled with nitrogen gas at 35 psi at 27\(^\circ\)C. It will burst if pressure exceeds 40 psi. The temperature in \(^\circ\)C at which the car tyre will burst is _________. (Rounded off to the nearest integer)

Identify A and B in the chemical reaction.

Consider the following chemical reaction.
The number of sp2 hybridized carbon atom(s) present in the product is ________.

Identify A in the given chemical reaction.

Which of the following equation depicts the oxidizing nature of H2O2?

The solubility of AgCN in a buffer solution of pH = 3 is x. The value of x is : [Assume : No cyano complex is formed; Ksp(AgCN) = 2.2 \(\times\) 10\(-\)16 and Ka(HCN) = 6.2 \(\times\) 10\(-\)10]

Ellingham diagram is a graphical representation of :

The correct statement about B2H6 is :

Which statement is correct?

0.4 g mixture of NaOH, Na2CO3 and some inert impurities was first titrated with \({N \over {10}}\) HCl using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5...

1 molal aqueous solution of an electrolyte A2B3 is 60% ionised. The boiling point of the solution at 1 atm is _________ K. (Rounded off to the nearest integer)[Given Kb for (H2O) = 0.52 K kg mol\(-\)1]

Complete combustion of 1.80 g of an oxygen containing compound (CxHyOz) gave 2.64 g of CO2 and 1.08 g of H2O. The percentage of oxygen in the organic compound is :

In basic medium \(Cr{O_4}^{2 - }\) oxidises \({S_2}{O_3}^{2 - }\) to form \(S{O_4}^{2 - }\) and itself changes into \(Cr{(OH)_4}^ -\). The volume of 0.154 M \(Cr{O_4}^{2 - }\) required to react with 40 mL of 0.25 M \({S_2}{O_3}^{2 - }\) is...

The plots of radial distribution functions for various orbitals of hydrogen atom against 'r' are given below :
The correct plot for 3s orbital is :

In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption \(\left( {{x \over m}} \right)\) is directly proportional to Px. The value of x is :

The reaction of cyanamide, NH2CN(s) with oxygen was run in a bomb calorimeter and \(\Delta\)U was found to be \(-\)742.24 kJ mol\(-\)1. The magnitude of \(\Delta\)H298 for the reaction$$N{H_2}C{H_{(S)}} + {3 \over 2}{O_{2(g)}} \to {N_{2(g)}...

The ionization enthalpy of Na+ formation from Na(g) is 495.8 kJ mol\(-\)1, while the electron gain enthalpy of Br is \(-\)325.0 kJ mol\(-\)1. Given the lattice enthalpy of NaBr is \(-\)728.4 kJ mol\(-\)1. The energy for the formation of NaB...