List of top Chemistry Questions asked in JEE Main

Number of carbocation from the following that are not stabilized by hyperconjugation is _________ .

Match List-I with the List-II

List-I (Compound / Species)	List-II (Shape / Geometry)
(A) \(SF_4\)	(I) Tetrahedral
(B) \(BrF_3\)	(II) Pyramidal
(C) \(BrO_{3}^{-}\)	(III) See saw
(D) \(NH^{+}_{4}\)	(IV) Bent T-shape

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Functional group present in sulphonic acid is :

Match List-I with the List-II

List-I Tetrahedral Complex	List-II Electronic configuration
(A) TiCl4	(I) e2, t20
(B) [FeO4]2-	(II) e4, t23
(C) [FeCl4]-	(III) e0, t22
(D) [CoCl4]2-	(IV) e2, t23

Choose the correct answer from the options given below:

Match List-I with the List-II

List-I Reaction	List-II Type of redox reaction
(A) N2(g) + O2(g) → 2NO(g)	(I) Decomposition
(B) 2Pb (NO3)2(s) → 2PbO(s) + 4NO2(g) + O2(g)	(II) Displacement
(C) 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)	(III) Disproportionation
(D) 2NO2(g) + 2OH-(aq) → NO2-(aq) + NO3-(aq) + H2O(l)	(IV) Combination

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DNA molecule contains 4 bases whoes structure are shown below. One of the structure is not correct, identify the incorrect base structure.

The ratio of number of oxygen atoms to bromine atoms in the product $Q$ is ___ $\times 10^{-1}$.

For the reaction at $298 \, \text{K}$, $2\text{A} + \text{B} \rightarrow \text{C}$. $\Delta H = 400 \, \text{kJ mol}^{-1}$ and $\Delta S = 0.2 \, \text{kJ mol}^{-1} \, \text{K}^{-1}$. The reaction will become spontaneous above ____ $\text{K}$.

Match List-I with the List-II

List-I (Molecule / Species)	List-II (Property / Shape)
(A) \(SO_2Cl_2\)	(I) Paramagnetic
(B) NO	(II) Diamagnetic
(C) \(NO^{-}_{2}\)	(III) Tetrahedral
(D) \(I^{-}_{3}\)	(IV) Linear

Choose the correct answer from the options given below:

Consider the given reaction, identify the major product P.

The ratio $\frac{K_P}{K_C}$ for the reaction:

Given below are two statements :
Statement I : Gallium is used in the manufacturing of thermometers.
Statement II : A thermometer containing gallium is useful for measuring the freezing point (256 K) of brine solution.
In the light of the above statement, choose the correct answer from the options given below :

Mass of ethylene glycol (antifreeze) to be added to 18.6 kg of water to protect the freezing point at $-24^\circ C$ is ____ kg (Molar mass in g mol$^{-1}$ for ethylene glycol = 62, $K_f$ of water = 1.86 K kg mol$^{-1}$).

The functional group that shows negative resonance effect is:

The amount of electricity in Coulomb required for the oxidation of 1 mol of \( \text{H}_2\text{O} \) to \( \text{O}_2 \) is \[\_ \times 10^5 \, \text{C}.\]

Number of compounds which give reaction with Hinsberg's reagent is_______.

Given below are two statements :
Statement (I) : Dimethyl glyoxime forms a six-membered covalent chelate when treated with NiCl2 solution in presence of NH4OH.
Statement (II) : Prussian blue precipitate contains iron both in (+2) and (+3) oxidation states. In the light of the above statements,
choose the most appropriate answer from the options given below:

Match List - I with List - II

Choose the correct answer from the options given below :

Acid D formed in above reaction is :

In the given reactions identify A and B.

\([ \text{Co(NH}_3)_6 ]^{3+}\) and \([ \text{CoF}_6 ]^{3-}\) are respectively known as:

The set of meta directing functional groups from the following sets is:

Select the compound from the following that will show intramolecular hydrogen bonding.

Following Kjeldahl's method, 1g of organic compound released ammonia that neutralized 10 mL of 2M H\(_2\)SO\(_4\). The percentage of nitrogen in the compound is _________.%.

Total number of isomeric compounds (including stereoisomers) formed by monochlorination of 2-methylbutane is________.