List of top Chemistry Questions asked in JEE Main

Which of the following is the correct plot for the probability density ψ2(r) as a function of distance ‘r’ of the electron from the nucleus for 2s orbital?

Match List-I with List-II:
 

List-I (Oxide)List-II (Nature)
(A) Cl2O7(I) Amphoteric
(B) Na2O(II) Basic
(C) Al2O3(III) Neutral
(D) N2O(IV) Acidic


Choose the correct answer from the options given below:

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

The major product in the following reaction is:
 

Fig. Chemical Reaction

Match List I with List II.

 List I List II
AZymaseIStomach
BDiastaseIIYeast
CUreaseIIIMalt
DPepsinIVSoyabean

Choose the correct answer from the options given below.

For the reaction given below:
\(CoCl_3.xNH_3 + AgNO_3 (aq) →\)
If two equivalents of AgCl precipitate out, then the value of x will be____.

Given below are two statements:
Statement I : The non bio-degradable fly ash and slag from steel industry used by cement industry.
Statement II : The fuel obtained from plastic waste is lead free.
In the light of the above statements, choose the most appropriate answer from the options given below:
Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?
The correct sequential order of the reagents for the given reaction is
A white precipitate was formed when BaCl2 was added to water extract of an inorganic salt. Further, a gas ‘X’ with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is
Amongst SF4, XeF4, CF4 and H2O, the number of species with two lone pair of electrons is _____.
The elevation in boiling point for 1 molal solution of non-volatile solute A is 3 K. The depression in freezing point for 2 molal solution of A in the same solvent is 6 K. The ratio of Kb and Kf i.e., \(\frac{K_b}{K_f}\) is 1 : X. The value of X is [nearest integer]
Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?
Low oxidation state of metals in their complexes are common when ligands :
Which of the following enhances the lathering property of soap?
White precipitate of \(AgCl\) dissolves in aqueous ammonia solution due to formation of:
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Fluorine forms one oxoacid.
Reason R: Fluorine has smallest size amongst all halogens and is highly electronegative.
In the light of the above statements, choose the most appropriate answer from the option given below.
Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is _____.
The correct order of nucleophilicity is
Oxidation of toluene to benzaldehyde can be easily carried out with which of the following reagents?
Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution?
An element M crystallises in a body centred cubic unit cell with a cell edge of 300 pm. The density of the element is 6.0 g cm–3. The number of atoms present in 180 g of the element is ______× 1023. (Nearest integer)

In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical ? 

(A) $Rb$ and $Cs$ 

(B) $Na$ and $K$ 

(C) $Ar$ and $Kr$ 

(D) $I $ and $At$ 

Choose the correct answer from the options given below :

When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are ____.

While estimating the nitrogen present in an organic compound by Kjeldahl’s method, the ammonia evolved from 0.25 g of the compound neutralized 2.5 mL of 2 M H2SO4. The percentage of nitrogen present in organic compound is ________