List of top Chemistry Questions asked in JEE Main

The product obtained from the electrolytic oxidation of acidified sulphate solutions, is :

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Lithium halides are some what covalent in nature.
Reason R : Lithium possess high polarisation capability.
In the light of the above statements, choose the most appropriate answer from the options given below :

The oxidation states of 'P' in $H_4P_2O_7$, $H_4P_2O_5$ and $H_4P_2O_6$, respectively, are :

The type of hybridisation and magnetic property of the complex $[MnCl_6]^{3-}$, respectively, are :

The number of geometrical isomers found in the metal complexes $[PtCl_2(NH_3)_2]$, $[Ni(CO)_4]$, $[Ru(H_2O)_3Cl_3]$ and $[CoCl_2(NH_3)_4]^+$ respectively, are :

Which one of the following statements is NOT correct ?

Which one among the following chemical tests is used to distinguish monosaccharide from disaccharide ?

Staggered and eclipsed conformers of ethane are :

The correct order of stability of given carbocations is :

Presence of which reagent will affect the reversibility of the following reaction, and change it to a irreversible reaction:
$CH_4 + I_2 \rightleftharpoons CH_3-I + HI$

Which one of the following compounds will give orange precipitate when treated with 2,4-dinitrophenyl hydrazine ?

Consider the above reaction and identify the Product P :

Given below are two statements:
Statement I : Aniline is less basic than acetamide.
Statement II : In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton.
Choose the most appropriate option :

Match List - I with List - II :

Choose the most appropriate match :

The compound 'A' is a complementary base of _________ in DNA strands.

The density of NaOH solution is 1.2 g cm$^{-3}$. The molality of this solution is ________ m. (Round off to the Nearest Integer)
[Use : Atomic masses : Na:23.0 u O:16.0 u H:1.0 u, Density of H$_2$O : 1.0 g cm$^{-3}$]

The difference between bond orders of CO and NO$^\oplus$ is $\frac{x}{2}$ where x = _________. (Round off to the Nearest Integer)

For water at 100$^\circ$C and 1 bar,
(Round off to the Nearest Integer)
[Use : R=8.31 J mol$^{-1}$ K$^{-1}$]
[Assume volume of H$\_2$O(l) is much smaller than volume of H$\_2$O(g). Assume H$\_2$O(g) can be treated as an ideal gas]

1.46 g of a biopolymer dissolved in a 100 mL water at 300 K exerted an osmotic pressure of $2.42 \times 10^{-3}$ bar. The molar mass of the biopolymer is _________ $\times 10^4$ g mol$^{-1}$. (Round off to the Nearest Integer)
[Use : R = 0.083 L bar mol$^{-1}$ K$^{-1}$]

$PCl_5 \rightleftharpoons PCl_3 + Cl_2 K_c = 1.844$
3.0 moles of $PCl_5$ is introduced in a 1 L closed reaction vessel at 380 K. The number of moles of $PCl_5$ at equilibrium is _________ $\times 10^{-3}$. (Round off to the Nearest Integer)

The conductivity of a weak acid HA of concentration 0.001 mol L$^{-1}$ is $2.0 \times 10^{-5}$ S cm$^{-1}$. If $\Lambda_m^\circ(HA) = 190$ S cm$^2$ mol$^{-1}$, the ionization constant (K$_a$) of HA is equal to _________ $\times 10^{-6}$. (Round off to the Nearest Integer)

$CO_2$ gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal, the mass of $CO_2$ adsorbed becomes 64 times when the pressure of $CO_2$ is doubled. The value of n in the Freundlich isotherm equation is _________ $\times 10^{-2}$. (Round off to the Nearest Integer)

The number of geometrical isomers possible in triamminetrinitrocobalt(III) is X and in trioxalatochromate(III) is Y. Then the value of X+Y is _________.

In gaseous triethyl amine the "-C-N-C-" bond angle is _________ degree.

An organic compound is subjected to chlorination to get compound A using 5.0 g of chlorine. When 0.5 g of compound A is reacted with AgNO$_3$ [Carius Method], the percentage of chlorine in compound A is _________ when it forms 0.3849 g of AgCl. (Round off to the Nearest Integer)
(Atomic masses of Ag and Cl are 107.87 and 35.5 respectively)