List of top Chemistry Questions asked in JEE Main

Which of the following is most acidic?

MX is a sparingly soluble salt that follows the given solubility equilibrium at 298 K.
MX(s) $\rightleftharpoons M^{+(aq) }+ X^{-}(aq)$; $K_{sp} = 10^{-10}$
If the standard reduction potential for $M^{+}(aq) + e^{-} \rightarrow M(s)$ is $(E^{\circ}_{M^{+}/M}) = 0.79$ V, then the value of the standard reduction potential for the metal/metal insoluble salt electrode $E^{\circ}_{X^{-}/MX(s)/M}$ is ____________ mV. (nearest integer)
[Given : $\frac{2.303 RT}{F} = 0.059$ V]

$X$ is the number of geometrical isomers exhibited by $[\mathrm{Pt(NH_3)(H_2O)BrCl}]$.
$Y$ is the number of optically inactive isomer(s) exhibited by $[\mathrm{CrCl_2(ox)_2}]^{3-}$.
$Z$ is the number of geometrical isomers exhibited by $[\mathrm{Co(NH_3)_3(NO_2)_3}]$. Find the value of $X + Y + Z$. }

Given below are two statements :
Statement I : Maltose is a non-reducing sugar
Statement II : Lactose is a reducing sugar

Statement I : BP order is HI<HBr<HCl<HF.
Statement II : MP order is HI<HF<HCl<HBr.

Benzene is subjected to the following sequence of reactions:
\[ \text{Benzene} \xrightarrow[\text{}]{\text{1) } CH_3Cl/AlCl_3} \xrightarrow[\text{}]{\text{2) } Cl_2/AlCl_3} \xrightarrow[\text{}]{\text{3) } K_2Cr_2O_7/H^+} X \] If $p$ gram of $X$ reacts with $NaHCO_3$, then $11.2\ dm^3$ of gas is obtained at STP. Calculate $p$.

Nuclei A and B form a nucleus C. BE/N for A, B and C are 3 MeV, 7 MeV and 6 MeV. Then energy produced in
\[ 2A^3 + B^4 \rightarrow C^{10} \]

Match the following

Incorrect order of atomic radius is

Which of the following pair of ions have equal number of unpaired electrons

Total number of lone pairs and $\sigma$ bond pairs formed by central atom (Xe) in $XeO_6^{4-}$ is:

Identify the code of amino acid and iodine derivative hormone in the given option.

Match List-I with List-II

List-I	List-II
(I) Vitamin C	(A) Thiamine
(II) Vitamin B₁	(B) Riboflavin
(III) Vitamin B₆	(C) Ascorbic Acid
(IV) Vitamin B₂	(D) Pyridoxine

For the given reaction:
CaCO3 + 2HCl → CaCl2 + H2O + CO2

If 90 g CaCO3 is added to 300 mL of HCl which contains 38.55% HCl by mass and has density 1.13 g mL-1,
then which of the following option is correct?

Given molar mass of H, Cl, Ca and O are 1, 35.5, 40 and 16 g mol-1 respectively.

What will be the mass of AgBr obtained when 1 gm of product is treated with AgNO₃ in the Carius method?

Statement I:

The carbocation in the structure $ \text{O}_2\text{N}\text{C} \text{H} $ is stabilized by the +R effect of the $ \text{-OCH}_3 $ group.
Statement II:

The carbocation in the structure $ \text{O}_2\text{N}\text{C} \text{H} $ is stabilized by the +R effect of the $ \text{-NO}_2 $ group.

20 ml of 0.2 M HA ($ K_a = 5 \times 10^{-4} $) is titrated with 10 ml of 0.2 M NaOH solution. Calculate the initial and final value of pH of the solution. [Given $ \log 5 = 0.7 $]

The correct set that contains all kinds of oxides (Basic, acidic, amphoteric, and neutral) is:

A cell is formed using the below half-cell reactions, and the cell is working with 80% efficiency. Work obtained is utilized for isothermal expansion of gas against external pressure of 1 kPa. Find $ \Delta V $ (in $ \text{m}^3 $). \[ \frac{1}{2} O_2 + 2H^+ + 2e^- \rightarrow H_2O; \, E^\circ = 1.23 \, \text{V} \] \[ 6H^+ + CO_2 + 6e^- \rightarrow CH_3OH + H_2O; \, E^\circ = 0.02 \, \text{V} \]

(A) is hydrocarbon

Correct statement about product X and Y

$\text{(a) They can be differentiated by NaHCO}_3 \text{ test.} $
$\text{(b) They both gives 2,4-DNP test.} \\ \text{(c) They both have same molecular mass.} \\ \text{(d) They both react with same rate with HCN.} $

A hydrocarbon has mass ratio of C and H in 12 : 1.
Each molecule of hydrocarbon has 2 carbon atoms.
Calculate mass of $ CO_2 $ (in gm) produced, when 3.38 gm hydrocarbon undergoes combustion.

Statement 1: The correct order of 2$^\text{nd}$ ionization energy for boron family elements is: $ \text{B}>\text{Al}>\text{Ga} $.
Statement 2: The correct order of 1$^\text{st}$ ionization energy for carbon family elements is: $ \text{Si}>\text{Ge}<\text{Pb}<\text{Sn} $.
Choose the correct option:

Which of the following are iso-structural with $ \text{SF}_4 $?

A metal of work function 2.3 eV is irradiated with radiation of wavelength $ y \times 10^2 $ nm. The maximum kinetic energy of ejected electron is $ 2.8 \times 10^{-20} $ J. Then calculate $ y $ (in nearest integer).