List of top Chemistry Questions asked in JEE Main

The correct decreasing order for metallic character is
In a cell, the following reactions take place
\(Fe^{2+} → Fe^{3+} + e^-\)
\(E°_{Fe^{3+}/Fe^{2+}} = 0.77\ V\)
\(2I^- → I_2 + 2e^-\)
\(E_{I_2/I^-} = 0.54\ V\)
The standard electrode potential for the spontaneous reaction in the cell is \(x×10^{–2} V\) at \(208\ K\). The value of \(x\) is _______. (Nearest Integer)
A 42.12% (w, v) solution of NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol is
[Given : Molar mass : Na = 23.0 g mol–1; Cl = 35.5 g mol–1]
Match List I with List II
 List I (polymer) List-II (Nature)
A.
 
A.
I.
Thermosetting polymer
B.
B.
II.
Fibers
C.
C.
III.
Elastomer
D.
D.
IV.Thermoplastic polymer
Choose the correct answer from the options given below:
The incorrect statement is

With respect to the following reaction, consider the given statements:

Fig








(A) o-Nitroaniline and p-nitroaniline are the predominant products.
(B) p-Nitroaniline and m-nitroaniline are the predominant products.
(C) HNO3 acts as an acid.
(D) H2SO4 acts as an acid.
Choose the correct option.

Which of the following statements are correct?
  1. The electronic configuration of Cr is [Ar] 3d54s1.
  2. The magnetic quantum number may have a negative value.
  3. In the ground state of an atom, the orbitals are filled in order of their increasing energies.
  4. The total number of nodes are given by n – 2.
Choose the most appropriate answer from the options given below :
The acid that is believed to be mainly responsible for the damage of Taj Mahal is
The correct decreasing order of energy for the orbitals having, following set of quantum numbers:
(A) n = 3, l = 0, m = 0
(B) n = 4, l = 0, m = 0
(C) n = 3, l = 1, m = 0
(D) n = 3, l = 2, m = 1
\(BeO\) reacts with \(HF\) in presence of ammonia to give \([A]\) which on thermal decomposition produces \([B]\) and ammonium fluoride. Oxidation state of Be in \([A]\) is _______
100 g of an ideal gas is kept in a cylinder of 416 L volume at 27°C under 1.5 bar pressure. The molar mass of the gas is ________ g mol–1. (Nearest integer). (Given : R = 0.083 L bar K–1 mol–1)

The number of molecules(s) or ions(s) from the following having non-planar structure is ____.
\(NO^-_3, H_2O_2, BF_3, PCl_3, XeF_4, SF_4, XeO_3, PH^+_4, SO3,[Al(OH)_4]^-\)

Ionic radii of cation A+ and anion B– are 102 and 181 pm, respectively. These ions are allowed to crystallize into an ionic solid. This crystal has cubic close packing for B–. A+ is present in all octahedral voids. The edge length of the unit cell of the crystal AB is _____pm. (Nearest integer)
The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are
Which of the given reactions is not an example of a disproportionation reaction?
Observe structures of the following compounds

The total number of structures/compounds which possess asymmetric carbon atoms is _____.

A solution of Fe2(SO4)3 is electrolyzed for ‘x’ min with a current of 1.5 A to deposit 0.3482 g of Fe. The value of x is _______. [nearest integer]

Given : 1 F = 96500 C mol–1. 

Atomic mass of Fe = 56 g mol–1

pH value of 0.001 M NaOH solution is _______.

4.0 moles of argon and 5.0 moles of PCl5 are introduced into an evacuated flask of 100 litre capacity at 610 K. The system is allowed to equilibrate. At equilibrium, the total pressure of mixture was found to be 6.0 atm. The Kp for the reaction is
 [Given : R = 0.082 L atm K–1 mol–1 ]
The major product in the given reaction is
Question Reaction
The Novolac polymer has mass of 963 g. The number of monomer units present in it are
Which of the following sets are correct regarding polymer?
  1. Copolymer : Buna-S
  2. Condensation polymer : Nylon-6,6
  3. Fibres : Nylon-6,6
  4. Thermosetting polymer : Terylene
  5. Homopolymer : Buna-N
Choose the correct answer from given options below
Which of the following ketone will NOT give enamine on treatment with secondary amines? [where t-Bu is –C(CH3)3]
Given below are two statements: one is labelled as Assertion A and, the other is labelled as Reason R.
Assertion A: [6] Annulene, [8] Annulene and cis-[10] Annulene, are respectively aromatic, not-aromatic and aromatic.
Reason R: Planarity is one, of the requirements of aromatic systems.
In the light of the above statements, choose the most appropriate answer from the options given below.
The rate constant for a first order reaction is given by the following equation :
\(ln\ k=33.24−\frac {2.0×10^4\ K}{T}\)
The activation energy for the reaction is given by ______ \(kJ mol^{–1}\). (In nearest integer)
(Given : \(R = 8.3 JK^{–1} mol^{–1}\))