List of top Chemistry Questions asked in JEE Main

When does a gas deviate the most from its ideal behaviour ?
In Carius method of estimation of halogens $250\, mg$ of an organic compound gave $141\, mg$ of $AgBr$. The percentage of bromine in the compound is (atomic mass $Ag\, =\, 108, Br \,= \,80$)
Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. The reaction between nitrogen and oxygen requires high temperature.
The number of geometric isomers that can exist for square planar $\left[ Pt ( Cl )( py )\left( NH _{3}\right)\right.$ $\left.\left( NH _{2} OH \right)\right]^{+}$ is $( py =$ pyridine $):$
The ionic radii (in $?$) of $N^{3-},O^{2-} $ and $F^-$ respectively are
Which artificial sweetener contains chlorine ?
Two Faraday of electricity is passed through a solution of $CuSO_4$. The mass of copper deposited at the cathode is (At. mass of $Cu\, = \,63.5\, u$)
Which of the following compounds is not colored yellow?
The standard Gibbs energy change at $300 \,K$ for the reaction $2 A \to B+C$ is $2494.2]$. At a given time, the composition of the reaction mixture is $[ A ]=\frac{1}{2},[ B ]=2$ and $[ C ] =\frac{1}{2} .$ The reaction proceeds in the : $[ R =8.314\, J / \,K /\, mol , e =2.718]$
Higher order $( > 3 )$ reactions are rare due to
Photochemical smog consists of excessive amount of $X$, in addition to aldehydes, ketones, peroxyacetyl nitrile $(PAN)$, and so forth. $X$ is :
The following reaction is performed at $298\, K ?$ $2 NO ( g )+ O _{2}( g ) \rightleftharpoons 2 NO _{2}( g )$ The standard free energy of formation of $NO ( g )$ is $86.6 \,kJ /\, mol$ at $298 \,K .$ What is the standard free energy of formation of $NO _{2}( g )$ at $298 \,K ?\left( K _{n}=1.6 \times 10^{12}\right)$
The correct order of thermal stability of hydroxides is :
The current voltage relation of diode is given by $I=\left(e^{1000 V / T}-1\right) mA$, where the applied voltage $V$ is in volt and the temperature $T$ is in kelvin. If a student makes an error measuring $\pm 0.01\, V$ while measuring the current of
Which polymer is used in the manufacture of paints and lacquers?
Which among the following is the most reactive?
Calamine is an ore of :
In the context of the Hall-Heroult process for the extraction of $Al$, which of the following statements is false?
The molecular formula of a commercial resin used for exchanging ions in water softening is $C_8H_7SO_3Na$ (molecular weight = $206$). What would be the maximum uptake of $Ca^{2+}$ ions by the resin when expressed in mole per gram resin
Which of the following compounds is not an antacid?
Match the catalysts to the correct processes :
Permanent hardness in water cannot be cured by :
Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?
Which physical property of dihydrogen is wrong ?
Chlorine water on standing loses its colour and forms :