List of top Chemistry Questions asked in JEE Main

The octahedral complex of a metal ion $M^{3+} $ with four monodentate ligands $L_1,L_2,L_3 \, and \, L_4 $ absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is

Van der Waal's equation for a gas is stated as, $p = \frac{nRT}{V-nb}-a\left(\frac{n}{V}\right)^{2}.$ This equation reduces to the perfect gas equation, $p = \frac{nRT}{V}$ when ,

Which one of the following substituents at para-position is most effective in stabilizing the phenoxide ion ?

Which one of the following molecules is paramagnetic ?

Which one of the following compounds will not be soluble in sodium bicarbonate?

Which one of the following acids does not exhibit optical isomerism?

Which of the following will not show mutarotation?

The ratio mass of oxygen and nitrogen of a particular gaseous mixture is $1 : 4$ The ratio of number of their molecule is

The total number of octahedral void(s) per atom present in a cubic close packec structure is :-

The rate coefficient $(k)$ for a particular reactions is $1.3 \times 10^{-4}\, M^{-1}\, s^{-1}$ at $100^{\circ}C$, and $1.3 \times 10^{-3}\,M^{-1}s^{-1}$ at $150^{\circ}C$ What is the energy of activation $(E_{a})$ (in $kJ$) for this reaction ? ($R =$ molar gas constant $= 8.314 \,JK^{-1}\,mol^{-1})$

Oxidation state of sulphur in anions $SO^{2-}_{3}. S_{2}O^{2-}_{4}$ and $S_{2}O^{2-}_{6}$ increases in the orders:

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

The Wurtz-Fittig reaction involves condensation of:

Stability of the species $ Li_2 , Li_2^- , \, \, and \, \, Li_2^+ $ increases in the order of

Formaldehyde can be distinguished from acetaldehyde by the use of :

For which of the following compounds Kjeldahl method can be used to determine the percentage of Nitrogen ?

Monocarboxylic acids are functional isomers of:

How many grams of methyl alcohol should be added to $10$ litre tank of water to prevent its freezing at $268\, K$ ? $\left(K_{f} \, for\, water\, is \,1.86 K\, kg \, mol^{-1} \right)$

Which of the free radical is most stable?

The density of $3M$ solution of sodium chloride is $1.252\, g\, mL^{-1}$. The molality of the solution will be: (molar mass, $NaCl = 585\, g\, mol^{-1}$)

Number of atoms in the following samples of substances is largest in :

$10\, mL$ of $2(M)$ $NaOH$ solution is added to $200\, mL$ of $0.5 (M)$ of $NaOH$ solution. What is the final concentration ?

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

Electrode potentials (E$^{\circ}$) are given below : $Cu^{+}/Cu=+0.52\, V,$ $Fe^{3+}/Fe^{2+} = +0.77 \,V,$ $\frac{1}{2}I_{2}\left(s\right)/I^{-} = 40.54 \,V,$ $Ag^{+}/Ag =+ 0.88\,V.$ Based on the above potentials, strongest oxidizing agent will be :

Copper crystallises in fcc with a unit length of $361\,pm$. What is the radius of copper atom ?