List of top Chemistry Questions asked in JEE Main

A gas ‘X’ is added to Nessler’s reagent then brown precipitate is formed, gas X is

The density of 'x' M solution ('x' molar) of NaOH is \(1.12 \, \text{g/mL}\). While in molality, the concentration of the solution is \(3 \, \text{m}\) (3 molal). Then x is:
Given: Molar mass of NaOH is \(40 \, \text{g/mol}\)

Which among the following compounds will undergo fastest \(S_N2\) reaction?

Identify major product ‘P’ formed in the following reaction.

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

Appearance of blood red colour on treatment of the sodium fusion extract of an organic compound with FeSO₄ in presence of concentrated H₂SO₄ indicates the presence of element(s).

The arenium ion which is not involved in the bromination of Aniline is .

Which of the following has maximum ionic character?

Given below are two statements :
Statement (I) : Kjeldahl method is applicable to estimate nitrogen in pyridine.
Statement (II) : The nitrogen present in pyridine can easily be converted into ammonium sulphate in Kjeldahl method.
In the light of the above statements, choose the correct answer from the options given below.

The reaction at cathode in the cells commonly used in clocks involves.

Consider the following complexes:
\([CoCl(NH_3)_5]^{2+}\) (A)
\([Co(CN)_6]^{3-}\) (B)
\([Co(NH_3)_5(H_2O)]^{3+}\) (C)
\([Cu(H_2O)_4]^{2+}\) (D)
The correct order of A, B, C, and D in terms of wavenumber of light absorbed is:

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

Identify the product A in the following reaction.

Given below are two statements:
Statement-I: The gas liberated on warming a salt with dil H₂SO₄, turns a piece of paper dipped in lead acetate into black, it is a confirmatory test for sulphide ion.
Statement-II: In statement-I the colour of paper turns black because of formation of lead sulphite. In the light of the above statements, choose the most appropriate answer from the options given below:

The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are

Given below are two statements:
Statement (I) : In the Lanthanoids, the formation of Ce⁺⁴ is favoured by its noble gas configuration.
Statement (II) : Ce⁺⁴ is a strong oxidant reverting to the common +3 state.
In the light of the above statements, choose the most appropriate answer from the options given below:

The ascending acidity order of the following H atoms is

If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:

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:

Match List - I with List - II.

Choose the correct answer from the options given below.

The major product(P) in the following reaction is

A species having carbon with sextet of electrons and can act as electrophile is called

Which structure of protein is intact after coagulation of egg white on boiling?

The correct statement about Zn, Cd, Hg are