List of top Chemistry Questions asked in JEE Main

Number of isomeric aromatic amines with synthesized by Gabriel Phthalimide synthesis molecular formula C8H11N, which can be is ______. jee main 2023
Among the following, the number of compounds which will give positive iodoform reaction is ____ .
(a) 1-Phenylbutan-2-one 
(b) 2-Methylbutan-2-ol 
(c) 3-Methylbutan-2-ol 
(d) 1-Phenylethanol 
(e) 3,3-dimethylbutan-2-one 
(f) 1-Phenylpropan-2-ol
In an ice crystal, each water molecule is hydrogen bonded to ___ neighbouring molecules
The number of colloidal systems from the following, which will have 'liquid' as the dispersion medium, is____.
Gem stones, paints, smoke, cheese, milk, hair cream, insecticide sprays, froth, soap lather.
The standard reduction potential at 298 K for the following half cells are given below  
NO − 3 3 − + 4H+ + 3e- → NO(g) +2H2O E0 = 0.97V 
\(V^{2+} (aq) + 2e^-→V\)           E0 = -1.19V 
\(Fe^{3+}(aq) + 3e^- → Fe\)        E0 = -0.04V 
\(Ag^+ (aq) + e^- → Ag(s)\)      E0 = 0.80V 
\(Au^{3+}(aq)+3e^-→Au(s)\) E0 = 1.40V 
The number of metal(s) which will be oxidized by  \(N0^-_3\) Oin aqueous solution is______.
The equilibrium composition for the reaction PCl3 + Cl2 ⇌ PCI5, at 298 K is given below. 
[PCl3]eq = 0.2 mol L-
[Cl2]eq = 0.1 mol L-1,
[PCl5]eq = 0.40 mol L-1 
If 0.2 mol of Cl2 is added at the same temperature, the equilibrium concentrations of PCl5 is ___ × 10-2 mol L-1
Given: Kc for the reaction at 298 K is 20
Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is/are...... 
A. 1 M aq. NaCl and 2 M aq. Urea 
B. 1 M aq. CaCl2 and 1.5 M aq. KCl 
C. 1.5 M aq. AlCl3 and 2 M aq. Na2SO4 
D. 2.5 M aq. KCl and 1 M aq. Al2(SO4)3
Consider the following date
Heat of combustion of H2(g)           = -241.8 kJ mol-1 
Heat of combustion of C(s)              = -393.5 kJ mol-1 
Heat of combustion of C2H5OH(1)  = -1234.7 kJ mol-1
The heat of formation of C2H5OH(1) is (-) ____ kJ mol-1 (Nearest integer)
The number of species having a square planar shape from the following is __
\(XeF_4, SF_4, SiF_4, BF^-_4 BrF^-_4,[Cu(NH_3)_4]^{2+}, [FeCl_4]^{2-}, [PtCl_4]^{2-}\)
Number of crystal systems from the following where body centred unit cell can be found, is......
Cubic, tetragonal, orthorhombic, hexagonal, rhombohedral, monoclinic, triclinic.
Given below are two statements :
Statement-I: Morphine is a narcotic analgesis. It helps in relieving pain without producing sleep. 
Statement-II: Morphine and its derivatives are obtained from opium poppy. 
In the light of the above statements, choose the correct answer from the options given below.
Match the terms in Column-I with their description in Column-II and choose the correct option:
 Amino Acid Letter Code
(A).Alanine(P).N
(B).Asparagine(Q).A
(C).Aspartic acid(R).R
(D).Arginine(S).D
The strongest acid from the following is
Find out the major product from the following reaction.
major product from the following reaction jee main 2023
From the figure of column chromatography given below, identify incorrect statements

A. Compound 'c' is more polar than 'a' and 'b' 
B. Compound 'a' is least polar
C. Compound 'b' comes out of the column before 'c' and after 'a' 
D. Compound 'a' spends more time in the column 
Choose the correct answer from the options given below
In the following reaction 'B' is
In the following reaction 'B' is jee main 2023
During the detection of Lead, the Formation of which of the following compounds is not used as a confirmatory test.
IUPAC name of the compound \(K_{3}[Co(C_{2}O_{4})_{3}]\) is
The group of chemicals used as pesticide is
Given below are two statements: One is labelled as "Assertion A" and the other is labelled as "Reason R".
Assertion A: In the complex Ni(CO), and Fe(CO)s, the metals have zero oxidation state.
Reason R: Low oxidation states are found when a complex has ligands capable of π-donor character in addition to the o-bonding.
In the light of the above statements, choose the most appropriate answer from the option given below.
During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction.
Group–13 elements react with \( O_2 \) in amorphous form to form oxides of type \( M_2O_3 \) (M = element). Which among the following is the most basic oxide?
The volume of HCl, containing $73 g L^{−1}$, required to completely neutralise NaOH obtained by reacting $0.69 g$ of metallic sodium with water, is _______ mL.( Nearest Integer)
(Given : molar Masses of Na, Cl, O, H, are 23,35.5,16 and 1 $g mol^{−1}$ respectively)
The compound which does not exist.
Given below are two statements :
Statement I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga.
Statement II : The d orbitals in Ga are completely filled. In the light of the above statements,
choose the most appropriate answer from the options given below