List of top Chemistry Questions

Oxidation number of hydrogen is (-1) in:
Solubility of \(\mathrm{AgCl}\) in \(10^{-2} \text{M} \mathrm{NaCl}\) solution is (\( K_{sp_{\mathrm{AgCl}}} = 1.8 \times 10^{-10} \)):
Hybridisation of \(\mathrm{Ni}\) in \(\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-\) is:}
Unit of \( K_C \) for equilibrium:
In the balanced redox reaction \(\mathrm{Cr}_2\mathrm{O}_7^{2-} + \mathrm{SO}_3^{2-} \longrightarrow \mathrm{Cr}^{3+} + \mathrm{SO}_4^{2-}\), the ratio of the number of \(\mathrm{Cr}_2\mathrm{O}_7^{2-}\) ions to \(\mathrm{SO}_4^{2-}\) ions is:
No work is done during free expansion of an ideal gas:
Polar molecule among the following is:
Minimum bond length is of:
Incorrect match of IUPAC symbol of elements with its respective atomic number is:
If a radiation of energy \( 4.25 \, \text{eV} \) falls on a metal surface, then the maximum kinetic energy of ejected electrons will be (work function of metal is \( 2.25 \, \text{eV} \)).
Relation between rate constant and half-life for a first-order reaction is:
Statement (A): Alkyl halides are not soluble in water.
Statement (B): Alkyl halides do not form H-bonds with water molecules through alkyl halide, but they are polar in nature. In light of the above statements, choose the most appropriate answer from the options given below:
The given reaction is known as: \[ \text{PhCH}_2\text{CN} + \text{SnCl}_2 + \text{HCl} \xrightarrow{\text{H}_3\text{O}^+} \text{PhCH}_2\text{CH=NH} \]
Given below are two statements:
Statement I: Propene on treatment with diborane gives an addition product with the formula \( \left( (CH_3)_2 CH \right)_3 B \)
Statement II: Oxidation of \( \left( (CH_3)_2 CH \right)_3 B \) with Hydrogen peroxide in the presence of NaOH gives propan-2-ol
In the light of the above statements, choose the most appropriate answer from the options given below:
A gas undergoes an isothermal process at 300 K, and its volume increases from 2 L to 4 L. If the initial pressure is 2 atm, what is the work done by the gas? (R = 8.314 J/mol·K, assume 1 mole)
What is the IUPAC name of the compound CH₃-CH₂-CO-CH₃?
For the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g), the equilibrium constant Kc is 0.5 at 400 K. If [N₂] = 0.1 M, [H₂] = 0.2 M, and [NH₃] = 0.05 M, what is the reaction quotient Qc?
Which of the following molecules has a trigonal planar molecular geometry?

What is the molarity of a solution prepared by dissolving 5.85 g of NaCl in 500 mL of water? 
(Molar mass of NaCl = 58.5 g/mol)

Markovnikov's rule is applicable to which of the following reactions?
The molar conductivities at infinite dilution for Na₂SO₄, K₂SO₄, KCl, HCl, and HCOONa at 300 K are 260, 308, 150, 426, and 105 S·cm²·mol⁻¹, respectively. What will be the molar conductivity at infinite dilution (Λ⁰) for formic acid in the same unit?

The solubility of barium iodate in an aqueous solution prepared by mixing 200 mL of 0.010 M barium nitrate with 100 mL of 0.10 M sodium iodate is $X \times 10^{-6} \, \text{mol dm}^{-3}$. The value of $X$ is ------.

Use: Solubility product constant $(K_{sp})$ of barium iodate = $1.58 \times 10^{-9}$

At 25$^\circ$C, the concentration of H$^+$ ions in $ 1.00 \times 10^{-3} \, \text{M} $ aqueous solution of a weak monobasic acid having acid dissociation constant $ K_a = 4.00 \times 10^{-11} $ is $ X \times 10^{-7} \, \text{M} $. The value of $ X $ is ____. {Use: Ionic product of water $ K_w = 1.00 \times 10^{-14} $ at 25$^\circ$C
The complex $[Cr(NH_3)_4Cl_2]^+$ shows how many geometrical isomers?
What volume will 2 moles of an ideal gas occupy at STP (Standard Temperature and Pressure)?