List of top Chemistry Questions asked in JEE Main

Moles of $CH_4$ required for formation of $22$ $g$ of $CO_2$ is $m \times 10^{-2}$ The value of $m$ is:

The total number of different alkanes formed when the following mixture is subjected to electrolysis: $CH_3COONa (aq)$ and $C_2H_2COONa (aq)$is (do not consider disproportionation reaction)

If one faraday of electricity is used in the discharging of $Cu^{2+}$, then find the mass (ing) of $Cu$ deposited (nearest integer)

The spin only magnetic moment of complex ion $[Ni(NH_3)_6]^{2+}$+ is $X \times 10^{-1}$ $BM$. The value of $X$ is

Rms velocity of hydrogen at which temperature is equal to that of the oxygen molecule at $47 \degree$

One mole of an ideal gas at 350K is in a 2.0 L vessel of thermally conducting walls, which are in contact with the surroundings. It undergoes isothermal reversible expansion from 2.0L to 3.0L against a constant pressure of 4 atm. The change in entropy of the surroundings (ΔS) is JK (Nearest integer) Given: R = 8.314 J K^-1 Mol^-1.

Match List I with List II :

List-I Coordination entity		List-II Wavelength of light absorbed in nm
A.	$[CoCl(NH_3)_5]^{2+}$	I.	310
B.	$[Co(NH_3)_6]^{3+}$	II.	475
C.	$[Co(CN)_6]^{3−}$	III.	535
D.	$[Cu(H_2O)_4]^{2+}$	IV.	600

Choose the correct answer from the options given below :

Match List-I with List-II :

Choose the correct answer from the options given below :

If the CFSE of $\left[ Ti \left( H _2 O \right)_6\right]^{3+}$ is $-960 kJ / mol$, this complex will absorb maximum at wavelength ___$nm$ (nearest integer) Assume Planck's constant $( h )=64 \times 10^{-34} Js$, Speed of light $( c )=30 \times 10^8 m / s$ and Avogadro's Constant $\left( N _{ A }\right)=6 \times 10^{23} / mol$

Match list I with list II:

List I		List II
A	K	I	Thermonuclear reactions
B	KCl	II	Fertilizer
C	KOH	III	Sodium potassium pump
D	Li	IV	Absorbent of CO₂

Choose the correct answer from the options given below:

Thin layer chromatography of a mixture shows the following observation:

The correct order of elution in the silica gel column chromatography is .

Match list I with list II:

List I	Species	List II	Geometry/ Shape
A	H₃ O⁺	I	Tetrahedral
B	Acetylide anion	II	Linera
C	NH₄ ⁺	III	Pyramidal
D	ClO₂^–	IV	Bent

Choose correct answer from the options given below:

Given below are two statements:
Statement I: Methane and steam passed over a heated Ni catalyst produces hydrogen gas.
Statement II: Sodium nitrate reacts with NH$_4$Cl to give H$_2$O and NaCl.

The set which does not have ambidentate ligands (labeled as (i)) is:

Arrange the following compounds in increasing order of rate of aromatic electrophilic substitution reaction:

Find out the correct statement from the options given below for the above 2 reactions.

$\text{o-Phenylenediamine}$ $\xrightarrow{HNO_3} X\text{ Major Product X is}$:

For elements B, C, N, Li, Be, O and F, the correct order of first ionization enthalpy is:

In the extraction process of copper, the product obtained after carrying out the reactions \[ \text{CuO} + \text{H}_2 \rightarrow \text{Cu} + \text{H}_2 \text{O} \] is called:

Given below are two statements:
Statement I: If BOD value is 4 ppm and dissolved oxygen is 8 ppm, it is a good quality water.
Statement II: If the concentration of zinc and nitrate is 5 ppm, then it can be used as good quality water.

In the above reaction 'A' and 'B' are:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: In the photoelectric effect electrons are ejected from the metal surface as soon as the beam of light of frequency greater than threshold frequency strikes the surface.
Reason R: When the photon of any energy strikes an electron in the atom transfer of energy from the photon to the electron takes place.

The complex that dissolves in water is:

Solid fuel used in rocket is a mixture of Fe₂O₃ and Al (in ratio 1 : 2) the heat evolved (KJ) per gram of the mixture is ______ (Nearest integer)
Given $\Delta H_f^{\circ}(Al_2O_3) = -1700 \, \text{KJ mol}^{-1}$
$\Delta H_f^{\circ}(Fe_2O_3) = -840 \, \text{KJ mol}^{-1}$ }

A mixture of 1 mole of H₂O and 1 mole of CO is taken in a 10 liter container and heated to 725 K. At equilibrium, 10 M of water by mass reacts with carbon monoxide according to the equation: \[ CO(g) + H_2O(g) \rightleftharpoons CO_2(g) + H_2(g) \] The equilibrium constant $ K_c \times 10^7 $ for the reaction is ______

	List I (Reagents Used)		List II (Compound with Functional group detected)
A	Alkaline solution of copper sulphate and sodium citrate	I
B	Neutral F_eCl₃solution	II
C	Alkaline chloroform solution	III
D	Potassium iodide and sodium hypochlorite	IV

List-I Coordination entity		List-II Wavelength of light absorbed in nm
A.	\([CoCl(NH_3)_5]^{2+}\)	I.	310
B.	\([Co(NH_3)_6]^{3+}\)	II.	475
C.	\([Co(CN)_6]^{3−}\)	III.	535
D.	\([Cu(H_2O)_4]^{2+}\)	IV.	600