List of top Chemistry Questions asked in JEE Main

Match List I with List II

LIST I (Name of polymer)		LIST II (Uses)
A	Glyptal	I	Flexible pipes
B	Neoprene	II	Synthetic wool
C	Acrilan	III	Paints and Lacquers
D	LDP	IV	Gaskets

Choose the correct answer from the options given below:

The increasing order of metallic character

A hydrocarbon ' $X$ ' with formula $C _6 H _8$ uses two moles of $H _2$ on catalytic hydrogenation of its one mole On ozonolysis, ' $X$ ' yields two moles of methane dicarbaldehyde The hydrocarbon ' $X$ ' is :

Identify the product formed (A and E)

Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid $[ A ]$ and $[ B ]$ are respectively

In the above reaction. Left hand side and right hand side rings are named as 'A' and 'B' respectively. They undergo ring expansion. The correct statement for this process is:

In the reaction given below ‘B’ is:

The energy of an electron in the first Bohr orbit of hydrogen atom is $-2.18×10^{-18}J$. Its energy in the third Bohr orbit is ____.

Incorrect statement for the use of indicators in acid-base titration is :

Consider the following date
Heat of combustion of H₂(g) = -241.8 kJ mol^-1
Heat of combustion of C(s) = -393.5 kJ mol^-1
Heat of combustion of C₂H₅OH(1) = -1234.7 kJ mol^-1
The heat of formation of C₂H₅OH(1) is (-) ____ kJ mol^-1 (Nearest integer)

Electrons in a cathode ray tube have been emitted with a velocity of $1000\, m s ^{-1}$ The number of following statements which is/are true about the emitted radiation is _______ Given : $h =6 \times 10^{-34} J s , m _e=9 \times 10^{-31} kg$

(A) The deBroglie wavelength of the electron emitted is $66667 nm$

(B) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube

(C) The cathode rays start from cathode and move towards anode

(D) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube

The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is

Choose the correct answer from the options given below:

Major product 'P' formed in the following reaction is:

Which of these reactions is not a part of breakdown of ozone in stratosphere?

A certain quantity of real gas occupies a volume of 30.15 dm3 at 100 atm and 500 K when its compressibility factor is 1.07. Its volume at 300 atm and 300K (When its compressibility factor is 1.4) is _____ x 10-4 dm3 (Nearest integer)

KMnO₄ is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute H₂SO₄. Number of water molecules produced for 2 molecules of KMnO₄ is______.

The number of colloidal systems from the following, which will have 'liquid' as the dispersion medium, is____.
Gem stones, paints, smoke, cheese, milk, hair cream, insecticide sprays, froth, soap lather.

Given below are two statements. one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : A solution of the product obtained by heating a mole of glycine with a mole of chlorine in presence of red phosphorous generates chiral carbon atom.
Reason R : A molecule with 2 chiral carbons is always optically active.
In the light of the above statements, 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 $\left( N _{ A }\right)=6 \times 10^{23} / mol$

The major component of which of the following ore is sulphide based mineral?

In the depression of freezing point experiment

A. Vapour pressure of the solution is less than that of pure solvent

B. Vapour pressure of the solution is more than that of pure solvent

C. Only solute molecules solidify at the freezing point

D. Only solvent molecules solidify at the freezing point

Choose the most appropriate answer from the options given below:

$Nd ^{2+}=$

A solution of $C_rO_5 $ in amyl alcohol has a _____ colour.

Which of the following compounds are not used as disinfectants?
A. Chloroxylenol
B. Bithional
C. Veronal
D. Prontosil
E. Terpineol
Choose the correct answer from the options given below:

The oxidation state of Mn in $KMnO_4$ changes by 3 units in which medium?