List of top Chemistry Questions

Correct order of first ionisation energy of B, In, Ga, and Al is:

Which among the following is not an aromatic species:

Which of the following aldehydes does not form iodoform on heating with $\mathrm{I_2}$ and alkali?

An element has two isotopes having atomic masses 10 and 15 u, respectively. If the percent abundance of lighter isotopes is 80%, then the average atomic mass of the element is:

The group which shows $-I$ and $-R$ effect is:

Oxidation number of hydrogen is (-1) in:

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:

Hybridisation of $\mathrm{Ni}$ in $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-$ is:}

Solubility of $\mathrm{AgCl}$ in $10^{-2} \text{M} \mathrm{NaCl}$ solution is ($ K_{sp_{\mathrm{AgCl}}} = 1.8 \times 10^{-10} $):

Unit of $ K_C $ for equilibrium:

Minimum bond length is of:

Polar molecule among the following is:

No work is done during free expansion of an ideal gas:

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} $).

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:

Relation between rate constant and half-life for a first-order reaction is:

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:

The given reaction is known as: \[ \text{PhCH}_2\text{CN} + \text{SnCl}_2 + \text{HCl} \xrightarrow{\text{H}_3\text{O}^+} \text{PhCH}_2\text{CH=NH} \]

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)

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?

What is the IUPAC name of the compound CH₃-CH₂-CO-CH₃?

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?