List of top Chemistry Questions asked in JEE Main

Which of the following will have maximum stabilization due to crystal field?

The \(\left(\frac{\partial E}{\partial T}\right)_p\) of different types of half cells are as follows:

A	B	C	D
1 × 10-4	2 × 10-4	0.1 × 10-4	0.2 × 10-4

(Where E is the electromotive force)
Which of the above half cells would be preferred to be used as reference electrode?

The correct order of increasing ionic radii is

If the radius of the 3^rd Bohr’s orbit of hydrogen atom is r₃ and the radius of 4^th Bohr’s orbit is r₄. Then

Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is 0.46 gL^–1 at 257°C and 100 mm Hg. The molar mass of geraniol is ____ g mol ^–1. (Nearest Integer) [Given: R = 0.082 L atm K^–1 mol^–1]

In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?

Given below are two statements :
Statement I: Maltose has two\(α-D-glucose\) units linked at \(C_1\) and \(C_4\) and is a reducing sugar.
Statement II: Maltose has two monosaccharides : 
\(α-D-glucose\) and \(β-D-glucose\) linked at \(C_1\) and \(C_6\) and it is a non-reducing sugar.
In the light of the above statements, choose the correct answer from the options given below.

Which of the following is most stable?

Which of the following structures are aromatic in nature?

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The ionic radii of \(O^{2–}\) and \(Mg^{2+}\) are same.
Reason (R) : Both \(O^{2–}\) and \(Mg^{2+}\) are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below.

Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in
List-II and select the most appropriate option.
  List-I                            List-II
(Shape)                    (Molecules)
(A) T-shaped             (I) XeF4
(B) Trigonal planar     (II) SF4
(C) Square planar       (III) CIF3
(D) See-saw                (IV) BF3

0.25 g of an organic compound containing chlorine gave 0.40 g of silver chloride in Carius estimation. The percentage of chlorine present in the compound is ______. [in nearest integer]
(Given : Molar mass of \(Ag\) is 108 g mol^–1 and that of \(Cl\) is 35.5 g mol^–1

The number of chiral alcohol(s) with molecular formula C₄H₁₀O is ____.

Sum of oxidation state (magnitude) and coordination number of cobalt in \(Na[Co(bpy)Cl_4]\) is____ .
(Given : bpy =)

Match List I with List II. 

	List-I		List-II
A.		I.	Br2 in CS2
B.		II.	Na2CR2O7/H2SO4
C.		III.	Zn
D.		IV.	CHCl3/NaOH

Choose the correct answer from the options given below:

A solution containing 2.5 × 10^–3 kg of a solute dissolved in 75 × 10^–3 kg of water boils at 373.535 K. The molar mass of the solute is _____ g mol^–1. [nearest integer] (Given : K_b(H₂O) = 0.52 K kg mol^–1 and boiling point of water = 373.15 K)

Given below are two statements:
Statement-I : In Hofmann degradation reaction, the migration of only an alkyl group takes place from carbonyl carbon of the amide to the nitrogen atom.
Statement-II : The group is migrated in Hofmann degradation reaction to electron deficient atom.
In the light of the above statements, choose the most appropriate answer from the options given below:

The cell potential for \(\text{Zn}|\text{Zn}^{2+}\text{(aq)}||\text{Sn}^{x+}|\text{Sn}\) is 0.801 V at 298 K.The reaction quotient for the above reaction is 10^–2. The number of electrons involved in the given electrochemical cell reaction is _____. (Given: \(Eº_Zn^{2+}\)|Zn=-0.763V,Eºsn^x+|sn=+0.008V and 2.303RT/F=0.06V)

Polar stratospheric clouds facilitate the formation of:

L-isomer of a compound ‘A’ \((C_4H_8O_4)\) gives a positive test with \([Ag(NH_3)^2]^+\). Treatment of ‘A’ with acetic anhydride yields triacetate derivative. Compound ‘A’ produces an optically active compound (B) and an optically inactive compound (C) on treatment with bromine water and \(HNO_3\) respectively. Compound (A) is:

Incorrect statement for Tyndall effect is:

Among the following species
N₂,N₂⁺,N₂⁻,N₂²⁻,O₂,O₂⁺,O₂⁻,O₂²⁻
the number of species showing diamagnetism is ________.