List of top Chemistry Questions asked in JEE Main

Two solutions $A$ and $B$ are prepared by dissolving $1 g$ of non-volatile solutes $X$ and $Y$ respectively in $1 \,kg$ of water The ratio of depression in freezing points for $A$ and $B$ is found to be $1: 4$ The ratio of molar masses of $X$ and $Y$ is :
Most stable product of the following reaction is:
The number of following statements which are incorrect line emission
High purity $(>9995 \%)$ dihydrogen is obtained by
The molar conductivity of a conductivity cell filled with $10$ moles of $20\, mL\, NaCl$ solution is $\Lambda_{ m 1}$ and that of $20$ moles another identical cell heaving $80 \, mL \, NaCl$ solution is $\Lambda_{ m 2}$, The conductivities exhibited by these two cells are same The relationship between $\Lambda_{ m 2}$ and $\Lambda_{ m 1}$ is
The depression in freezing point observed for a formic acid solution of concentration $05\, mL\, L ^{-1}$ is $00405^{\circ} C$ Density of formic acid is $105 \, g \, mL ^{-1}$ The Van't Hoff factor of the formic acid solution is nearly : (Given for water $k _{ f }=186 \, K \, kg \, mol ^{-1}$ )

Match items of Row I with those of Row II

A cubic solid is made up of two elements $X$ and $Y$ Atoms of $X$ are present on every alternate corner and one at the center of cube $Y$ is at $\frac{1}{3} rd$ of the total faces. The empirical formula of the compound is

Increasing order of stability of the resonance structures is: Choose the correct answer from the options given below:

Formulae for Nessler's reagent is:
' $25$ volume' hydrogen peroxide means
$Ka _1, Ka _2$ and $Ka _3$ are the respective ionization constants for the following reactions (a), (b) and (c)
(a) $H _2 C _2 O _4 \rightleftharpoons H ^{+}+ HC _2 O _4^{-}$
(b) $HC _2 O _4^{-} \rightleftharpoons H ^{+}+ HC _2 O _4^{2-}$
(c) $H _2 C _2 O _4 \rightleftharpoons 2 H ^{+}+ C _2 O _4^{2-}$
The relationship between $K _{ a _1}, K _{ a _2}$ and $K _{ a _3}$ is given as
Increasing order of stability of the resonance structures is: Choose the correct answer from the options given below:
The $Cl - Co - Cl$ bond angle values in a fac- $\left[ Co \left( NH _3\right)_3 Cl _3\right]$ complex is/are:
Which one of the following reactions does not occur during extraction of copper?
Given below are two statements, one is labelled as Assertion $A$ and the other is labelled as Reason R 
Assertion A : Butylated hydroxy anisole when added to butter increases its shelf life
Reason R : Butylated hydroxy anisole is more reactive towards oxygen than food
In the light of the above statements,choose the most appropriate answer from the options given below

Least stable Hydride is?

Which one of the following reactions does not occur during extraction of copper?
For micelle formation, which of the following statements are correct?
(A) Micelle formation is an exothermic process
(B) Micelle formation is an endothermic process
(C) The entropy change is positive
(D) The entropy change is negative

Match the columns Column I Column II (a) Biodegradable (p) polyacrylonitrie (b) Synthetic (q) PHBV (c) Natural (r) dacron (d) Polyester (s) Rubber

The reaction of $H _2 O _2$ with potassium permanganate in acidic medium leads to the formation of mainly:

Given below are two statements, one is labelled as Statement-1 and the other is labelled as Statement-2: Statement-1: Sulphides are converted into oxide first. Statement-2: Because oxides can be reduced easily. In the light of the above statements, choose the correct answer from the options given below

For the given reaction
The total number of possible products formed by tertiary carbocation
The total number of possible products formed by tertiary carbocation of A is____.
The mass of NH3 produced when 131.8 kg of cyclohexanecarbaldehyde undergoes Tollen's test is ___ kg. (Nearest Integer)
Molar Mass of C = 12g/mol 
N = 14g/mol 
0 = 16g/mol
Values of work function (Wo) for a few metals are given below
Metal LiNaKMgCuAg
 Wo/eV2.422.32.253.74.84.3

The number of metals which will show photoelectric effect when light of wavelength 400nm falls on it is____ 

Given: h = 6.6 × 10-34 J s 
c = 3 x 108 m s-1 
e = 1.6 x 10-19 C