List of top Chemistry Questions asked in JEE Main

Match List I with List II

List-I	List-II
A. Melting point [K]	I. Tl > In > Ga > Al > B
B. Ionic Radius [M3/pm]	II. B > Tl > Al ≈ Ga ≈ In
C. ΔiH1 [kJ mol-1]	III. Tl > In > Al > Ga > B
D. Atomic Radius [pm]	IV. B > Al > Tl > In > Ga

Choose the correct answer from the options given below:

Number of moles of \(H^+\) required by \(1\) mole \(MnO_4^-\) to oxidize oxalate ion to \(CO_2\) is ____ .

Match List I with List II
\(\begin{array}{|c|c|c|} \hline \text{LIST-I} & & \text{LIST-II} \\ \hline \text{A. Glucose/NaHCO}_3/\Delta & & \text{I. Gluconic acid} \\ \text{B. Glucose/HNO}_3 & & \text{II. No reaction} \\ \text{C. Glucose/HI/} \Delta & & \text{III. n-hexane} \\ \text{D. Glucose/Bromine water} & & \text{IV. Saccharic acid} \\ \hline \end{array}\)
Choose the correct answer from the options given below:

If \(5\) moles of an ideal gas expands from \(10\) L to a volume of \(100\) L at \(300k\) under isothermal and reversible condition then work, \(W\), is \(- x J\). The value of x is \((even \;n = 8.314 \;J \;K^{-1} mol^{-1})\)

For a reaction taking place in three steps at the same temperature, the overall rate constant \( K = \frac{K_1 K_2}{K_3} \). If \( E_{a1} \), \( E_{a2} \), and \( E_{a3} \) are 40, 50, and 60 kJ/mol respectively, the overall \( E_a \) is ____ kJ/mol.

The number of species from the following which are paramagnetic and with bond order equal to one is ___.

Species: H₂, He₂⁺, O₂^-, N₂, O₂^2-, F₂, Ne₂⁺, B₂

How many of the following compounds have \(sp^3\) hybridized central atoms?
\(H_2O, NH_3, SiO_2, SO_2, CO, CH_4\) and \(BF_3\)

What will be the reactivity order of following compounds towards electrophilic substitution reaction ?

Find the total number of sigma and pi bonds in 2-formyl hex-4-enoic acid.

Find out charge (in C) required for electrolysis of \(1\) mole of \(H_2O\) to produce \(O_2\) on one of the electrodes. \((F = 96500 \;C)\)

Half life of a first order reaction is \(36\;hr\). Find out time (in hour) required for concentration of reactant to get reduced by \(90\%\).

Oxidation state of Fe(iron) in complex formed in brown ring test

Color of \(Pbl_2\)

Number of isomeric products formed by monochlorination Of \(2-methyl \) \(butane\) in presence of sunlight is

A compound \((x)\) with molar mass \(108\) \(g\) \(mol^{-1}\) undergoes acetylation to give product with molar mass \(192\) \(g\) \(mol^{-1}\)

Ethylene glycol of \(x\) \(kg\) is mixed with \(18.6\) \(kg\) of solvent, \(24 °C\) depression in freezing point takes place. Calculate value of \(x\). (Given: \(K_1\) = \(1.6 °C/molal\) M.W. of ethylene glycol = \(62\) \(g/mol\))

Statement-I : Aniline on reaction with concentrated \(H_2SO_4\) at 475 K gives p-amino benzene sulphonic acid. This gives blood red colour with Lassaigne’s test. 
Statement-II : Aniline forms a salt with anhydrus \(AlCl_3\) in Friedel Craft’s reaction.

Find out sum of the coefficients of all the species involved in the balanced equation: \(2MnO_4+I^-\xrightarrow[{Medium}]{Alkaline}\)

Choose the correct answers. 

1. \(Mn_2O_7 \) is a oil at room temperature. 
2. \(V_2O_4\) react with acid to give \(VO^{2+}\).
3. \(CrO\) is a basic oxide.
4. \(V_2O_5\) does not react with acids.

Quantum number for outermost electron of K-atom are given by

Statement-I : Among \(15^{th}\) group hydrides reducing character decreases from
\(NH_3\) to \(BiH_3\).
Statement-II : \(E_2O_3\) and \(E_2O_5\) are always basic. [Where \(E\) is group \(15\) element]

Statement I: So disproportionates into \(H_2S_2O_3\) and \(S_2^-\) in alkaline medium 
Statement II: \(ClO_4^-\) undergoes disproportionation in acidic medium