List of top Chemistry Questions asked in JEE Main

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:

Given below are two statements:
Statement (I): p-nitrophenol is more acidic than m-nitrophenol and o-nitrophenol.
Statement (II): Ethanol will give immediate turbidity with Lucas reagent.
In the light of the above statements, choose the correct answer from the options given below:

What pressure (bar) of $ \text{H}_2 $ would be required to make the emf of a hydrogen electrode zero in pure water at $ 25^\circ \text{C} $?

The values of conductivity of some materials at $ 298.15 \, \text{K} $ in $ \text{S m}^{-1} $ are:
$ 2.1 \times 10^3, \, 1.0 \times 10^{-16}, \, 1.2 \times 10^1, \, 3.91, \, 1.5 \times 10^{-2}, \, 1 \times 10^{-7}, \, 1.0 \times 10^3 $.
The number of conductors among the materials is ______.

$ A_{(g)} \rightleftharpoons B_{(g)} + \frac{C}{2}_{(g)} $ The correct relationship between $ K_P $, $ \alpha $, and equilibrium pressure $ P $ is:

Consider the following elements.

Which of the following is/are true about A',B',C'andD' ? A. Order of atomic radii: $ B' < A' < D' < C' $
B. Order of metallic character: $ B' < A' < D' < C' $
C. Size of the element: $ D' < C' < B' < A' $
D. Order of ionic radii: $ B^{+} < A^{+} < D^{+} < C^{+} $
Choose the correct answer from the options given below:

From the vitamins $ A, \, B_1, \, B_6, \, B_{12}, \, C, \, D, \, E, \, \text{and} \, K $, the number of vitamins that can be stored in our body is ______.

Given below are two statements:
Statement I: Aniline reacts with con. $ H_2SO_4 $ followed by heating at 453–473 K gives p-aminobenzene sulphonic acid, which gives blood red colour in the 'Lassaigne's test'.
Statement II: In Friedel-Craft's alkylation and acylation reactions, aniline forms salt with the $ AlCl_3 $ catalyst. Due to this, nitrogen of aniline acquires a positive charge and acts as a deactivating group.
In the light of the above statements, choose the correct answer from the options given below:

A compound ($ x $) with molar mass $ 108 \, \text{g mol}^{-1} $ undergoes acetylation to give a product with molar mass $ 192 \, \text{g mol}^{-1} $. The number of amino groups in the compound ($ x $) is ______.

Choose the correct statements from the following:
A. $ Mn_2O_7 $ is an oil at room temperature
B. $ V_2O_4 $ reacts with acid to give $ VO_2^{2+} $
C. $ CrO $ is a basic oxide
D. $ V_2O_5 $ does not react with acid
Choose the correct answer from the options given below:

Identify structure of 2,3-dibromo-1-phenylpentane.

Which of the following is least ionic ?

A diatomic molecule has a dipole moment of $ 1.2 \, D $. If the bond distance is $ 1 \, \text{Å} $, then fractional charge on each atom is ______ $ \times 10^{-1} \, \text{esu} $.
(Given $ 1 \, D = 10^{-18} \, \text{esu cm} $)

Choose the correct statements from the following:
A. All group 16 elements form oxides of general formula $ EO_2 $ and $ EO_3 $ where $ E = S, Se, Te, $ and Po. Both the types of oxides are acidic in nature.
B. TeO$_2$ is an oxidising agent while SO$_2$ is reducing in nature.
C. The reducing property decreases from H$_2$S to H$_2$Te down the group.
D. The ozone molecule contains five lone pairs of electrons.
Choose the correct answer from the options given below:

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is -

The azo-dye (Y) formed in the following reactions is: Sulphanilic acid + NaNO$_2$ + CH$_3$COOH → X