List of top Chemistry Questions asked in JEE Main

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

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:

Solubility of calcium phosphate (molecular mass, \( M \)) in water is \( W_g \) per 100 mL at \( 25^\circ C \). Its solubility product at \( 25^\circ C \) will be approximately:

Acid D formed in above reaction is :

Given below are two statements:
Statement (I): \( \text{SiO}_2 \) and \( \text{GeO}_2 \) are acidic while \( \text{SnO} \) and \( \text{PbO} \) are amphoteric in nature.
Statement (II): Allotropic forms of carbon are due to property of catenation and \( p\pi-d\pi \) bond formation.
In the light of the above statements, choose the most appropriate answer from the options given below:

Lassaigne's test is used for detection of :

Which among the following has highest boiling point?

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

In the given reactions identify A and B.

The number of radial node/s for 3p orbital is:

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

The strongest reducing agent amont the following is:

Which of the following compounds show colour due to d-d transition?

Match List - I with List - II.

Choose the correct answer from the options given below.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In aqueous solutions \( \text{Cr}^{2+} \) is reducing while \( \text{Mn}^{3+} \) is oxidising in nature.
Reason (R): Extra stability to half-filled electronic configuration is observed than incompletely filled electronic configuration.
In the light of the above statement, choose the most appropriate answer from the options given below:

Given below are two statements:
Statement (I): A \(\pi\) bonding MO has lower electron density above and below the inter-nuclear axis.
Statement (II): The \(\pi^*\) antibonding MO has a node between the nuclei.
In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements :
Statement (I) : Both metal and non-metal exist in p and d-block elements.
Statement (II) : Non-metals have higher ionisation enthalpy and higher electronegativity than the metals.
In the light of the above statements, choose the most appropriate answer from the option given below:

The transition metal having highest \(3^\text{rd}\) ionisation enthalpy is:

The major products from the following reaction sequence are product A and product B.

The total sum of \(\pi\) electrons in product A and product B are ______ (nearest integer)

An ideal gas, \(\overline{C_V} = \frac{5}{2} R\), is expanded adiabatically against a constant pressure of 1 atm until it doubles in volume.
If the initial temperature and pressure are \(298 \, \text{K}\) and \(5 \, \text{atm}\), respectively, then the final temperature is ______ \( \, \text{K} \) (nearest integer).
Given: \(\overline{C_V}\) is the molar heat capacity at constant volume.

Among \(\text{CrO}\), \(\text{Cr}_2\text{O}_3\), and \(\text{CrO}_3\), the sum of spin-only magnetic moment values of basic and amphoteric oxides is ______ \( \times 10^{-2} \, \text{BM} \) (nearest integer).
Given: Atomic number of Cr is 24.

9.3 g of pure aniline upon diazotisation followed by coupling with phenol gives an orange dye. The mass of orange dye produced (assume 100% yield/ conversion) is ________g. (nearest integer)

Number of molecules from the following which can exhibit hydrogen bonding is ______. (nearest integer)

The difference in the 'spin-only' magnetic moment values of \( \text{KMnO}_4 \) and the manganese product formed during titration of \( \text{KMnO}_4 \) against oxalic acid in acidic medium is ______ BM (nearest integer).

Time required for 99.9% completion of a first order reaction is _____ time the time required for completion of 90% reaction.(nearest integer).