List of top Chemistry Questions asked in JEE Main

4.5 moles each of hydrogen and iodine is heated in a sealed ten litre vessel. At equilibrium, 3 moles of HI were found. The equilibrium constant for H₂(g) + I₂(g) ⇋ 2HI(g) is _____________ .

The number of possible isomeric products formed when 3-chioro-1-butene reacts with HCl through carbocation formation is __________

The volume of hydrogen liberated at STP by treating 2.4 g of magnesium with excess of hydrochloric acid is _________ × 10^–2 L
Given : Molar volume of gas is 22.4 L at STP.
Molar mass of magnesium is 24 g mol^–1

The number of correct statement from the following is _________ .
A. For 1s orbital, the probability density is maximum at the nucleus
B. For 2s orbital, the probability density first increases to maximum and then decreases sharply to zero.
C. Boundary surface diagram of the orbitals encloses a region of 100% probability of finding the electron.
D. p and d-orbitals have 1 and 2 angular nodes respectively E. probability density of p-orbital is zero at the nucleus

Number of compounds from the following which will not produce orange red precipitate with Benedict solution is ____________
Glucose, maltose, sucrose, ribose, 2-deoxyribose, amylose, lactose

The number of correct statements about modern adsorption theory of heterogeneous catalysis from the following is _______
A. The catalyst is diffused over the surface of reactants.
B. Reactants are adsorbed on the surface of the catalyst.
C. Occurrence of chemical reaction on the catalysts surface through formation of an intermediate.
D. It is a combination of intermediate compound formation theory and the old adsorption theory
E. It explains the action of the catalyst as well as those of catalytic promoters and poisons.

The number of correct statements from the following is ______
A. E^cell is an intensive parameter
B. A negative E^θ means that the redox couple is a stronger reducing agent than the H^– H₂ couple.
C. The amount of electricity required for oxidation or reduction depends on the stoichiometry of the electrode reaction.
D. The amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the quantity of electricity passed through the electrolyte.

The maximum number of lone pairs of electron on the central atom from the following species is ___________
ClO₃^– , XeF₄, SF₄ and I₃^–

The total number of intensive properties from the following is __________
Volume. Molar heat capacity, Molarity, E^θ cell. Gibbs free energy change. Molar mass, Mole

Mg(NO₃)₂. XH₂O and Ba(NO₃)₂.YH₂O, represent formula of the crystalline forms of nitrate salts. Sum of X and Y is _____________ .

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: [CoCl(NH₃)]^2– absorbs at lower wavelength of light with respect to [Co(NH₃)₅(H₂O) ^3–
Reason R: It is because the wavelength of the light absorbed depends on the oxidation state of the metal ion.
In the light of the above statements, choose the correct answer from the options given below:

Compound ‘B’ is

What weight of glucose must be dissolved in 100 g of water to lower the vapour pressure by 0.20 mm Hg?
(Assume dilute solution is being formed)
Given : Vapour pressure of pure water is 54.2 mm Hg at room temperature. Molar mass of glucose is 180 g mol^–1 .

Given below arc two statements:
Statement I : In the metallurgy process. sulphide ore is converted to oxide before reduction.
Statement II : Oxide ores in general are easier to reduce.
In the light of the above statements, choose the most appropriate answer from the options given below

Which one of the following pairs is an example of polar molecular solids ?

The major product formed in the following reaction is
 
A.
B.
C.
D.
Choose the correct answer from the options given below:

Match List I with List II

LIST I Complex		LIST II Colour
A.	Mg(NH4)PO4	I.	brown
B.	K3[Co(NO2)6]	II.	white
C.	MnO(OH)2	III.	yellow
D.	Fe4[Fe(CN)6]3	IV.	blue

Choose the correct answer from the options given below:

If Ni^2– is replaced by Pt^2– in the complex NiCl₂Br₂] ^2– , which of the following properties are expected to get changed?
A. Geometry
B. Geometrical isomerism
C. Optical isomerism
D. Magnetic properties

Given below are two statements:
Statement I : Ethene at 333 to 343 K and 6-7 atm pressure in the presence of AIEt₃ and TiCl₄ undergoes addition polymerization to give LDP.
Statement II: Caprolactam at 533-543 K in H₂O through step growth polymerizes to give Nylon 6.
In the light of the above statements, choose the correct answer from the options given below:

Which of the following compounds is an example of Freon?

One mole of P₄ reacts with 8 moles of SOCI₂ to give 4 moles of A. x mole of SO₂ and 2 moles of B. A, B and x respectively are

Product [X] formed in the above reaction is:

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:

For a chemical reaction A + B —q Product. the order is 1 with respect to A and B. What is the value of x and y?

Rate mol L-1S-1	[A] mol L-1	[B] mol L-1
0.10	20	0.5
0.40	x	0.5
0.80	40	y

Given below are two statements. one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: can be subjected to Wolff-Kishner reduction to give
Reason R: Wolff-Kishner reduction is used to convert into 
In the light of the above statements, choose the correct answer from the options given below: