List of top Chemistry Questions asked in JEE Main

The plot of pH-metric titration of weak base NH4OH vs strong acid HCl looks lie:

Given below are two statements:

Statement I: [Ni(CN)4]2– is square planar and diamagnetic complex, with dsp2 hybridization for Ni but [Ni(CO)4] is tetrahedral, paramagnetic and with sp3-hybridization for Ni.
Statement II: [NiCl4]2– and [Ni(CO)4] both have same d-electron configuration, have same geometry and are paramagnetic.

In light of the above statements, choose the correct answer from the options given below :

The correct order of melting point is
At \(298\ K\), the equilibrium constant is \(2 × 10^{15}\) for the reaction:
\(Cu(s)+2Ag+(Aq)⇌Cu^{2+}(aq)+2Ag(s)\)
The equilibrium constant for the reaction:
\(\frac 12Cu^{2+}(aq)+Ag(s)+(Aq)⇌\frac 12Cu(s)+Ag^+(aq)\) is \(x \times10^{-8}\).
The value of \(x\) is ______ . (Nearest integer)
In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?
Which statement is NOT correct for p-toluenesulphonyl chloride?
White phosphorus reacts with thionyl chloride to give
The solubility product of a sparingly soluble salt \(A_2X_3\) is \(1.1 × 10^{–23}\). If the specific conductance of the solution is \(3×10^{–5}\) S m–1, the limiting molar conductivity of the solution is \(x×10^{–3}\) S m2 mol–1. The value of x is _______.
Which one of the lanthanoids given below is the most stable in divalent form?
According to MO theory, number of species/ions from the following having identical bond order is ___.
CN-, NO+, O2, O+2, O2+2
The structure shown below is of which well-known drug molecule?
drug molecule
Stability of α-Helix structure of proteins depends upon
Match List-I with List -II
List - IList - II
(A) \(ψ_{MO}=ψ_A-ψ_B\)(I) Dipole moment
(B) \(µ=Q×r \)(II) Bonding molecular orbital
(C) \(\frac{N_b-N_a}2\)(III) Anti-bonding molecular orbital
(D) \(ψ_{MO}=ψ_A+ψ_B\)(IV) Bond order

Choose the correct answer from options given below:

Consider the following statements :
(A) The principal quantum number ‘n’ is a positive integer with values of ‘n’ = 1, 2, 3, ….
(B) The azimuthal quantum number ‘l’ for a given ‘n’ (principal quantum number) can have values as ‘l’ = 0, 1, 2, …n
(C) Magnetic orbital quantum number ‘ml’ for a particular ‘l’ (azimuthal quantum number) has (2l + 1) values.
(D) ±1/2 are the two possible orientations of electron spin.
(E) For l = 5, there will be a total of 9 orbital
Which of the above statements are correct?

The resistance of a conductivity cell containing \(0.01\) M KCl solution at \(298\ K\) is \(1750\ Ω\). If the conductivity of \(0.01\) M KCl solution at \(298\ K\) is \(0.152×10^{–3}\) S cm–1, then the cell constant of the conductivity cell is ______ \(×10^{–3}\) cm–1.
Match List I with List II.
 List I (Anion) List II (gas evolved on reaction with dil \(H_2SO_4\))
A.\(CO_3^{ 2−}\)I.Colourless gas which turns lead acetate paper black.
B.\(S^{2–}\)II.Colourless gas which turns acidified potassium dichromate solution green
C.\(SO_3^{ 2−}\)III.Brown fumes which turns acidified KI solution containing starch blue.
D.\(NO_2^{−}\)IV.Colourless gas evolved with brisk effervescence, which turns lime water milky.
Choose the correct answer from the options given below:

Match List-I with List-II
 

 List-I Ore List-II Composition
A.SideriteI.FeCO3
B.MalachiteII.CuCO3. Cu(OH)2
C.SphaleriteIII.ZnS
D.CalamineIV.ZnCO3


Choose the correct answer from the options given below:

Dihydrogen reacts with CuO to give
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R 
Assertion A: Zero orbital overlap is an out of phase overlap. 
Reason R: It results due to different orientation/direction of approach of orbitals. 
In the light of the above statements, choose the correct answer from the options given below
A mixture of hydrogen and oxygen contains 40% hydrogen by mass when the pressure is 2.2 bar. The partial pressure of hydrogen is _______ bar. (Nearest integer)
Which of the following is not an example of a condensation polymer?
Amongst the following, the number of oxide(s) which are paramagnetic in nature is
Na2O, KO2, NO2, N2O, ClO2, NO, SO2, Cl2O
The equation k = (6.5 × 1012s–1)e–26000K/T is followed for the decomposition of compound A. The activation energy for the reaction is ______ kJ mol–1. [nearest integer]
(Given : R = 8.314 J K–1 mol–1]
The cell potential for the given cell at 298 K \(\text{Pt} | \text{H}_2 \text{(g, 1 bar)} | \text{H}^+ \text{(aq)} || \text{Cu}^{2+} \text{(aq)} | \text{Cu(s)}\) is 0.31 V. The pH of the acidic solution is found to be 3, whereas the concentration of Cu2+ is 10–x M. The value of x is _____.
(Given : \(E^{Θ}_{Cu^{2+}/Cu}\) = 0.34 V and \(\frac{2.303RT}{F}\) = 0.06 V)
Hex-4-ene-2-ol on treatment with PCC gives ‘A’ on reaction with sodium hypoiodite gives ‘B’, which on further heating with soda lime gives ‘C’. The compound ‘C’ is