List of top Chemistry Questions asked in JEE Main

In an oligopeptide named Alanylglycylphenyl alanyl isoleucine, the number of sp² hybridised carbons is_____.

The reaction 2NO + Br2 → 2NOBr 
takes places through the mechanism given below : 
NO + Br2 ⇔ NOBr2 (fast)  
NOBr2 + NO → 2NOBr (slow) 
The overall order of the reaction is_____.

At 600K, the root mean square (rms) speed of gas X (molar mass = 40) is equal to the most probable speed of gas Y at 90K. The molar mass of the gas Y is ____ g mol^-1. (Nearest integer)

The value of x compound ‘D’ is

Three organic compounds A, B and C were allowed to run in thin layer chromatography using hexane and gave the following result (see figure). The R_f value of the most polar compound is ____ x 10^-2.

Match List I with List II

	List I-Examples		List II-Type
A	2-Chloro-1, 3-butadiene	I	Nylon 2-nylon 6
B	Nylon 2-nylon 6	II	Synthetic Rubber
C	Polyacrylonitrile	III	Polyester
D	Dacron	IV	Addition Polymer

Choose the correct answer from the options given below:

Correct statements for the given reaction are:

A. Compound 'B' is aromatic 
B. The completion of above reaction is very slow 
C. 'A' shows tautomerism 
D. The bond lengths C-C in compound B are found to be same 
Choose the correct answer from the options given below

Match List I with List II

	List I		List II
A	Nitrogen oxides in air	I	Eutrophication
B	Nitrogen oxides in air	II	Eutrophication
C	Carbon dioxide	III	Global warming
D	Phosphate fertilisers in water	IV	Acid rain

Choose the correct answer from the options given below:

The two products formed in above reaction are

For lead storage battery pick the the correct statements.
A. During charging of battery, PbSO4 on anode is converted into PbO2 
B. During charging of battery, PbSO4 on cathode is converted into PbO2 
C. Lead storage battery, consists of grid of lead packed with PbO2 as anode 
D. Lead storage battery has ~ 38% solution of sulphuric acid as an electrolyte 
Choose the correct answer from the options given below:

A metal chloride contains 55.0% of chlorine by weight. 100 mL vapours of the metal chloride at STP weigh 0.57 g. The molecular formula of the metal chloride is (Given: Atomic mass of chlorine is 35.5u)

Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: 5f electrons can participate in bonding to a far greater extent than 4f electrons 
Reason R: 5f orbitals are not as buried as 4f orbitals 
In the light of the above statements, choose the correct answer from the options given below: 

Match List I with List II

	List I -complex		List II-CFSE
A	[Cu(NH3)6]2+	I	-6.0
B	[Ti(H2O)6]3+	II	-2.0
C	[Fe(CN)6]3-	III	-1.2
D	[NiF6]4-	IV	-0.4

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: In the Ellingham diagram, a sharp change in slope of the line is observed for Mg → MgO at ~ 1120°C 
Reason R: There is a large change of entropy associated with the change of state. 
In the light of the above statements, choose the correct answer from the options given below : 

Match List I with List II

	List I -Type of Hydride		List II-Example
A	Electron deficient hydride	I	MgH2
B	Electron rich hydride	II	HF
C	Electron precise hydride	III	B2H6
D	Saline hydride	IV	CH4

Choose the correct answer from the options given below:

The incorrect statement regarding the reaction given below is

Products The two products formed in above reaction are

In the following reaction

A is

The major products ‘P’ formed in the following sequence of reaction is

Match List-I with List-II

	List-I		List-II
A	Nitrogen oxides in air	I	Eutrophication
B	Methane in air	II	pH of rain water becomes 5.6
C	Carbon dioxide	III	Global warming
D	Phosphate fertilisers in water	IV	Acid rain

Choose the correct answer from the options given below:

Given below are two statement: one is labelled asAssertion A and the other is labelled as Reason R.
Assertion A: 5f electrons can participate in bonding to a far greater extent than 4f electrons 
Reason R: 5f orbitals are not as buried as 4f orbitals 
In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements :
Statement I: Boron is extremely hard indicating its high lattice energy 
Statement II: Boron has highest melting and boiling point compared to its other group members. 
In the light of the above statements, choose the most appropriate answer from the options given below :

The bond order and magnetic property of acetylide ion are same as that of

The density of the alkali metals is in the order:

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature. 
Reason R: CO tends to get decomposed at higher temperature. 
In the light of the above statements, choose the correct answer from the options given below