List of top Chemistry Questions asked in JEE Main

An artificial radioactive isotope gave ${^{14}_{7}N}$ after two successive $\beta$ -particle emissions. The number of neutrons in the parent nucleus must be :

Maximum number of orbitals possible when n = 4 and m = 0?

Which of the following have undistorted octahedral structures?
1. $S{F}_6$
2. $P{F}_6^{-}$
3. $Si{F}_6^{2-}$
4. $Xe{F}_6$
Select the correct answer using the codes given below:

At equilibrium the concentrations of ${\mathrm{N}}_2=3.0\times {10}^{-3}\mathrm{M},{\mathrm{O}}_2=4.2\times {10}^{-3}\mathrm{M}$ and $\mathrm{NO}=2.8\times {10}^{-3}\mathrm{M}$ in a sealed vessel at $800\mathrm{K}$. What will be ${\mathrm{K}}_{\mathrm{C}}$ for the reaction ${\mathrm{N}}_{2(\mathrm{g})}+{\mathrm{O}}_{2(\mathrm{g})}\leftrightharpoons 2{\mathrm{NO}}_{(\mathrm{g})}?$

Choose the correct statement(s):
A Beryllium oxide is purely acidic in nature
B Beryllium carbonate is kept in the atmosphere of $CO _2$
C Beryllium sulphate is readily soluble in water
D Beryllium shows anomalous behavior
Choose the correct answer from the options given below:

How can photochemical smog be controlled?

Thermoplastics are:

Highest oxidation state of $Mn$ is exhibited in $Mn _2 O _7$ The correct statements about $Mn _2 O _7$ are
(A) Mn is tetrahedrally surrounded by oxygen atoms
(B) $Mn$ is octahedrally surrounded by oxygen atoms
(C) Contains $Mn-O-Mn$ bridge
(D) Contains $Mn - Mn$ bond
Choose the correct answer from the options given below:

The $\mathrm{pH}$ value of $0.1\mathrm{M}$ solution of anilinium chloride is:$(K_a$ of $C_6{H}_{5}N{H}_3^{+}={10}^{-6})$

Given below are two statements:
Statement I: Tropolone is an aromatic compound and has 8л electrons. 
Statement II: electrons of >C = O group in tropolone is involved in aromaticity. 
In the light of the above statements, choose the correct answer from the options given below

Match the List I with List II

	List I		List II
(A)	Weak intermolecular forces of attraction	I	Hexamethylenedia mine + adipic acid
(B)	Hydrogen bonding	II	AlEt3 + TiCl4
(C)	Heavily branched polymer	III	2-chloro-1, 3-butadiene
(D)	High density polymer	III	phenol+ formaldehyde

choose the correct answer from the options given below:

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The diameter of colloidal particles in solution should not be much smaller than wavelength of light to show Tyndall effect. 
Reason R : The light scatters in all directions when the size of particles is large enough. 
In the light of the above statements, choose the correct answer from the options given below

What happens when methane undergoes combustion in systems A and B respectively?

The covalency and oxidation state respectively of boron in [BF₄]^-, are

Match the List I with List II
1- Bromopropane is reacted with regents in List I to give products in List II

	List I-Reagent		List II-Product
(A)	KOH(alc)	I	Nitrile
(B)	KCL(alc)	II	Ester
(C)	AgNo2	III	Alkene
(D)	H3CC00Ag	III	Nitroalkane

Choose the correct answer from the options given below:

The total number of stereoisomers for the complex [Cr(ox)₂Clbr]³- (where oxalate) is:

The correct group of halide ions which can be oxidised by oxygen in acidic medium is

Which of the following complexes will exhibit maximum attraction to an applied magnetic field?

better method for preparation of bef₂ among the following is

Given below are two statements related to Ellingham diagram:
Statement-I: Ellingham diagrams can be constructed for formation of oxides, sulfides and halides of metals. 
Statement-II : It consists of plots of ΔfH° vs T for formation of oxides of elements. 
In the light of the above statements, choose the most appropriate answer from the options given below

Given below are two statements, one is labelled as Assertion: A and the other is labelled as Reason R. 
Assertion: A Isotopes of hydrogen have almost same chemical properties, but difference in their rates of reaction. 
Reason: R Isotopes of hydrogen have different enthalpy of bond dissociation. 
In the light of the above statements, choose the most appropriate answer from the options given below

The major products for the following reaction is