List of top Chemistry Questions asked in JEE Main

Out of the following, how many compounds have tetrahedral geometry?
\text{NH}_4^+, \, \text{XeF}_4, \, [\text{NiCl}_4]^{2-}, \, [\text{PtCl}_4]^{2-}, \, [\text{Cu(NH}_3\text{)}_4]^{2+}, \, \text{BF}_3, \, [\text{Ni(CO)}_4]
Which of the following is the correct order of bond length?
Consider the structure of HNO$_3$:
Select the correct option having formal charge of I, II, III and IV respectively.
In which of the following pairs first compound has more covalent nature than second compound? (a) \( \text{SnCl}_2, \text{SnCl}_4 \) (b) \( \text{PbCl}_4, \text{PbCl}_2 \) (c) \( \text{UF}_6, \text{UF}_4 \)
Select correct statements(s) (A) $\text{NF}_3$ has more dipole moment than $\text{NH}_3$ (B) $\text{O}_2^{2-}$ and $\text{F}_2$ both have same bond order (C) In $\text{O}_3$ central oxygen atom has $+1$ formal charge (D) In $\text{NO}_2$ all the atoms follow octet rule, so it is stable. (E) $\text{BeH}_2$ is planar
Statement–I: Sucrose is dextrorotatory and upon hydrolysis it becomes laevorotatory. Statement–II: Sucrose on hydrolysis gives glucose and fructose such that the laevorotation of glucose is more than the dextrorotation of fructose. Choose the correct option.
If percentage of N$_2$ above a liquid solution is 80% at a total pressure of 10 atm, then find the mole fraction of N$_2$ gas dissolved in solution.
[Given that Henry’s constant for N$_2$ is $7.6 \times 10^7$ mm Hg]
Given below are two statements: Statement–I: $K_H$ is constant with change in concentration of gas till the solution is dilute at a given temperature. Statement–II: According to Henry’s law, the partial pressure of gas in vapour phase is inversely proportional to the mole fraction of gas in solution.
Two solutes, $0.3 \text{ gm}$ of $\text{A}$ ($M_w = 60 \text{ gm/mol}$) & $0.9 \text{ gm}$ of $\text{B}$ ($M_w = 180 \text{ gm/mol}$) are dissolved in $100 \text{ ml}$ solution. Find osmotic pressure of solution at $300 \text{ K}$ (in $\text{atm}$) ($\text{R} = 0.082 \text{ atm}-\text{L/mol-K}$)
Salt ($\text{X}$) is soluble in water. Salt ($\text{Y}$) is sparingly soluble in water. Salt ($\text{Z}$) is soluble only in hot water. $\text{X}, \text{Y}, \text{Z}$ respectively are.
$W \text{ gm}$ of non-volatile electrolyte solute is added in $100 \text{ ml}$ pure water ($\text{P}^\circ = 640 \text{ mm Hg}$) showing vapour pressure of solution $600 \text{ mm Hg}$. This solution have $\text{b}.\text{p}$. of $375 \text{ K}$. Given $K_b$ of $\text{H}_2\text{O} = 0.52 \frac{K \cdot \text{kg}}{\text{mol}}$. Molar mass of solute $= \text{M}$. Select the correct option about mole fraction of solute ($\text{X}_{\text{solute}}$).
5 g of a solute X (M. wt = 200 g/mol) is dissolved in 250 g benzene. If \( \Delta T_f = 0.5 \, \text{K} \) and the relative lowering of vapour pressure is \( P \times 10^4 \), find \( P \). Given: \( K_f = 5.5 \, \text{K} \, \text{kg} \, \text{mol}^{-1} \), solute dimerises in benzene.
If pure liquids A and B have vapour pressures of 55 kPa and 15 kPa respectively. If in a solution of A and B, mole fraction of A in vapour is 0.8, then find mole fraction of A in liquid phase.
In the reaction sequence shown below, what is the mass (in grams) of product (C) formed?
Osmotic pressure of a solution is 12 atm. What is the concentration of NaCl solution which is isotonic to the given solution at 900 K? Given \( R = 0.082 \, \text{L-atm K}^{-1} \text{mol}^{-1} \) (Assume 100% dissociation)
Solution-1 : \(2.025\,\text{g}\) glucose, \(125\,\text{mL}\)
Solution-2 : \(9\,\text{g}\) urea, \(500\,\text{mL}\)
Solution-3 : \(1.9\,\text{g}\) CaCl$_2$, \(250\,\text{mL}\)
Solution-4 : \(20.5\,\text{g}\) Al$_2$(SO$_4$)$_3$, \(750\,\text{mL}\)
[2mm] Order of \(\Delta T_b\) is:
2 moles of liquid A and 3 moles of liquid B are mixed to from an ideal solution. The vapour pressure of ideal solution is 320 mm Hg. When 1 mole of A & 1 mole of B is further added then new vapour pressure of solution is 328.57 mm Hg. Find the vapour pressure of pure A ($P_A^\circ$) & pure B ($P_B^\circ$):
Given below are two statements:
Statement-I: \( K_H \) is constant with change in concentration of gas till solution is dilute at a given temperature.
Statement-II: According to Henry’s Law, partial pressure of gas in vapor phase is inversely proportional to mole fraction of gas in solution.
Statement-I: K$_h$ for ideal dilute solution does not change with varying the concentration of solute.
Statement-II: K$_h$ for solution having same gas solute is independent of nature of solvent?
10 mL of \(2\,\text{M}\) NaOH solution is added to 20 mL of \(1\,\text{M}\) HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric flask of 100 mL containing 2 moles of HCl and the volume is made up to the mark with distilled water. The solution in this flask is:
100 g 98% by weight \( \mathrm{H_2SO_4} \) is mixed with 100 g 49% by weight \( \mathrm{H_2SO_4} \). Mole fraction of \( \mathrm{H_2SO_4} \) in the solution is:
Choose the correct graph for the mixture of the volatile liquid CS$_2$ and acetone.
3 moles of liquid A and 1 mole of liquid B are mixed to form an ideal solution. The vapour pressure of solution becomes $500 \text{ mm Hg}$. If 1 mole of A is further added then vapour pressure of solution increases by $20 \text{ mm Hg}$. Find vapour pressure of pure B ($P_B^o$) in $\text{mm Hg}$ ?
Which of the following complexes has unpaired electrons?
A complex Cr(H$_2$O)$_6$Cl$_3$ shows conductance similar to a 1 : 2 electrolyte in aqueous solution. 9.3 g of this complex is passed through a cation exchanger and excess AgNO$_3$ is added. Find the mass of AgCl precipitated in grams.
[Molar mass of Cr = 52 g/mol]