List of top Chemistry Questions

Arrange in the correct order of stability (decreasing order) for the following molecules :

Which of the following compounds will not undergo Friedal-Craft's reaction easily?

The order of basicity of amines in gaseous state is:

The molarity of a solution obtained by mixing $750\, mL$ of $0.5\, M \,HCl$ with $250\, mL$ of $2 \,M \,HCl$ will be

Sodium Carbonate cannot be used in place of $(NH_4)_2CO_3$ for the identification of $Ca^{2+},\, Ba^{2+}$ and $Sr^{2+}$ ions (in group V) during mixture analysis because :

The correct set of four quantum numbers for the valence electrons of rubidium atom $(Z = 37)$ is

Benzene and naphthalene form an ideal solution at room temperature. For this process, the true statement(s) is (are)

Equimolar solutions of the following compounds are prepared separately in water. Which will have the lowest pH value ?

Which of the following is a polar molecule ?

The order of stability of the following tautomeric compounds is

Nitrobenzene on reaction with conc. HNO₃/H₂SO4 at 80-100°C forms which one of the following products ?

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating ?

Which is the monomer of Neoprene in the following ?

The radical is aromatic because it has

6.02 × 10²⁰ molecules of urea are present in 100 mL of its solution. The concentration of solution is

In the reaction A is

$6$ litres of an alkene require $27$ litres of oxygen at constant temperature and pressure for complete combustion. The alkene is:

At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm^-1 cm² mol^-1 and at infinite dilution its molar conductance is 238 ohm^-1 cm² mol^-1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers ?
n = 3, l=1 and m = -1

The value of Planck's constant is 6.63 × 10^-34 Js. The speed of light is 3 x 10¹⁷ nm s^-1. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 x 10¹⁵ s^-1?

A reaction having equal energies of activation for forward and reverse reactions has

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20°C to 35°C ? (R = 8.314 J mol^-1 K^-1)

In which of the following exothermic reactions, the heat liberated per mole is the highest ?

According to Freundlich adsorption isotherm, the amount of gas adsorbed at very high pressure