List of top Chemistry Questions asked in JEE Main

The number of possible isomeric products formed when 3-chioro-1-butene reacts with HCl through carbocation formation is __________
The number of correct statements from the following is ______
A. Ecell is an intensive parameter
B. A negative Eθ 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.
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 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, Eθ cell. Gibbs free energy change. Molar mass, Mole
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 lover 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:
Mg(NO3)2. XH2O and Ba(NO3)2.YH2O, represent formula of the crystalline forms of nitrate salts. Sum of X and Y is _____________ .
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.
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:
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
If Ni2– is replaced by Pt2– 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
Which one of the following pairs is an example of polar molecular solids ?
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
The number of incorrect statement/s from the following is ____ .
A. The successive half lives of zero order reactions decreases with time.
B. A substance appearing as reactant in the chemical equation may not affect the rate of reaction.
C. Order and molecularity of a chemical reaction can be a fractional number.
D. The rate constant units of zero and second order reaction are mol L–1s–1 and mol–1 Ls–1 respectively.
In alkaline medium, the reduction of permanganate anion involves a gain of _____ electrons.
The difference in the oxidation state of \(Xe\) between the oxidised product of \(Xe\) formed on complete hydrolysis of \(XeF_4\) and \(XeF_4\) is _____ .
The number of endothermic process/es from the following is _____ .
A. \(I_2 (g) → 2I (g)\)
B. \(HCl (g) → H(g) + Cl (g)\)
C. \(H_2O(l) → H_2O (g)\)
D. \(C(s) + O_2 (g) → CO_2 (g)\)
E. Dissolution of ammonium chloride in water.
The number of molecules from the following which contain only two lone pair of electrons is _____ .
\(H_2O, N_2, CO, XeF_4, NH_3, NO, CO_2, F_2\)
The reaction used for preparation of soap from fat is :
\(A(g) ⇋ 2B(g) + C(g)\)
For the given reaction, if the initial pressure is 450 mm Hg and the pressure at time t is 720 mm Hg at a constant temperature T and constant volume V. The fraction of A(g) decomposed under these conditions is \(x × 10^{–1}\). The value of x is _____ . (nearest integer)
An aqueous solution of volume 300 cm3 contains 0.63 g of protein. The osmotic pressure of the solution
at 300 K is 1.29 mbar. The molar mass of the protein is ____ g mol–1.
Given: R = 0.083 L bar K–1 mol–1
The electron in the \(n^{th}\) orbit of \(Li^{2+}\) is excited to \((n + 1)\) orbit using the radiation of energy \(1.47 × 10^{–1}J \) (as shown in the diagrarn). The value of n is ______ .
Given: \(R_H = 2.18 × 10^{–18} J\).
The decreasing order of hydride affinity for following carbocations is:The decreasing order of hydride affinity
Choose the correct answer from the options given below:
Incorrect method of preparation for alcohols from the following is: