List of top Chemistry Questions asked in JEE Main

What is the major product of the following reaction?

Compound A reacts with $NH _4 Cl$ and forms a compound B.

Compound B reacts with $H _2 O$ and excess of $CO _2$ to form compound $C$ which on passing through or reaction with saturated $NaCl$ solution forms sodium hydrogen carbonate Compound $A , B$ and $C$, are respectively.

The total number of acidic oxides from the following list is: $NO , N _2 O , B _2 O _3, N _2 O _5$, $CO , SO _3, P _4 O _{10}$

Calculate mass of Tollen’s Reagent Required?

It is observed that characteristic $X$-ray spectra of elements show regularity When frequency to the power " $n$ " ie $v^n$ of $X$-rays emitted is plotted against atomic number " $Z$ ", following graph is obtained

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason $R$
Assertion A :

can be easily reduced using $Zn - Hg / HCl$ to

Reason R : $ Zn \cdot Hg / HCl$ is used to reduce carbonyl group to $- CH _2-$ group.

In the light of the above statements, choose the correct answer from the options given below:

A compound A on reaction with X and Y produces the same major product but different by product a and b Oxidation of a gives a substance produced by ants X and Y respectively are :

In the above conversion of compound $( X )$ to product $( Y )$, the sequence of reagents to be used will be:

Major product of the following reaction is

Match List I with List II.

List-I		List-II
A	Sulphate	I	Pesticide
B	Fluoride	II	Bending of bones
C	Nicotine	III	Laxative effect
D	Sodium arsinite	IV	Herbicide

Choose the correct answer from the options given below:

Which of the following has maximum number of l.p. at central atom?

The geometry around boron in the product 'B' formed from the following reaction is $ BF _3+ NaH \xrightarrow{450 K } A + NaF$ $ A + NMe _3 \rightarrow B$

Red ppt. by Benedict solution is?

What is the chemical formula of freon gas?

$20 \,mL$ of $01 \,M \,NH _4 OH$ is mixed with $40\, mL$ of $005\, M \,HCl$ The $pH$ of the mixture is nearest to: (Given: $K _{ b }\left( NH _4 OH \right)=1 \times 10^{-5}, \log 2=030$, $\log 3=048, \log 5=069, \log 7=084$, $\log 11=104$ )

The number of correct statement/s from the following is
A. Larger the activation energy, smaller is the value of the rate constant
B. The higher is the activation energy, higher is the value of the temperature coefficient
C. At lower temperatures, increase in temperature causes more change in the value of $k$ than at higher temperature
D. A plot of $\ln k$ vs $\frac{1}{T}$ is a straight line with slope equal to $-\frac{E_a}{R}$

Given below are two statements Statement I : Pig iron is obtained by heating cast iron with scrap iron Statement II : Pig iron has a relatively lower carbon content than that of cast iron In the light of the above statements, 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) : Acetal / Ketal is stable in basic medium.

Reason (R) : The high leaving tendency of alkoxide ion gives the stability to acetal ketal in basic medium

In the light of the above statements, 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: Acetal / Ketal is stable in basic medium
Reason R: The high leaving tendency of alkoxide ion gives the stability to acetal ketal in basic medium
In the light of the above statements, choose the correct answer from the options given below :

The IUPAC nomenclature of an element with electronic configuration $[ Rn ] 5 f ^{14} 6 d ^1 7 s ^2$ is :

Which of the following sets of quantum numbers is not allowed?

In the reaction given below ‘B’ is:

$SO _2 Cl _2$ on reaction with excess of water results into acidic mixture $SO _2 Cl _2+2 H _2 O \rightarrow H _2 SO _4+2 HCl$ 16 moles of $NaOH$ is required for the complete neutralisation of the resultant acidic mixture The number of moles of $SO _2 Cl _2$ used is :

High purity $(>9995 \%)$ dihydrogen is obtained by