List of top Chemistry Questions

Which of the following compounds exhibits ionic bonding?

A group 15 element forms $ d\pi - d\pi $ bond with transition metals. It also forms a hydride, which is the strongest base among the hydrides of other group members that form $ d\pi - d\pi $ bonds. The atomic number of the element is ________________________.

The number of molecules/ions that show linear geometry among the following is _____. SO₂, BeCl₂, CO₂, N₃⁻, NO₂, F₂O, XeF₂, NO₂⁺, I₃⁻, O₃

Match the LIST-I with LIST-II:

Choose the correct answer from the options given below :

Total number of non-bonded electrons present in $ \text{NO}_2 $; ion based on Lewis theory is:

Which of the following has $\text{sp}^3\text{d}^2$ hybridisation?

Resonance in X$_2$Y can be represented as

The enthalpy of formation of X$_2$Y is 80 kJ mol$^{-1}$, and the magnitude of resonance energy of X$_2$Y is:

Match the LIST-I with LIST-II.

Choose the correct answer from the options given below :

In $ SO_2 $, $ NO_2^- $ and $ N_3^- $ the hybridizations at the central atom are respectively :

20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is $\_\_\_\_\_$ x $10^{-2}$M. (Nearest integer)

Arrange the following in increasing order of solubility product: \[ {Ca(OH)}_2, {AgBr}, {PbS}, {HgS} \]

0.1 M solution of KI reacts with excess of $ \text{H}_2\text{SO}_4 $ and KIO$_3$, according to the equation: \[ 5I^- + 6H^+ \rightarrow 3I_2 + 3H_2O \]

Identify the correct statements:

(A) 200 mL KI solution reacts with 0.004 mol of KIO₃
(B) 200 mL KI solution reacts with 0.006 mol of H₂SO₄
(3) 0.5 L KI solution produced 0.005 mol of I₂
(4) Equivalent weight of KIO₃ is equal to Molecular weight / 5

Which of the following solutions can form a minimum boiling azeotrope?

Which of the following binary mixture does not show the behavior of minimum boiling azeotropes?

Sea water, which can be considered as a 6 molar (6 M) solution of NaCl, has a density of 2 g mL$^{-1}$. The concentration of dissolved oxygen (O$_2$) in sea water is 5.8 ppm. Then the concentration of dissolved oxygen (O$_2$) in sea water, in x $\times$ 10$^{-4}$ m. x = _______. (Nearest integer)
Given: Molar mass of NaCl is 58.5 g mol$^{-1}$Molar mass of O$_2$ is 32 g mol$^{-1}$.

10 mL of 2 M NaOH solution is added to 20 mL of 1 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 made the volume upto the mark with distilled water. The solution in this flask is :

The number of paramagnetic complexes among $[FeF_6]^{3-}, [Fe(CN)_6]^{3-}, [Mn(CN)_6]^{3-}, [Co(C_2O_4)_3]^{3-}, [MnCl_6]^{3-}$ and $[CoF_6]^{3-}$, which involved $d^2sp^3$ hybridization is ...............

A solution of glucose (molar mass = 180 g mol$^{-1}$) in water has a boiling point of 100.20°C. Calculate the freezing point of the same solution. Molal constants for water $K_f$ and $K_b$ are 1.86 K kg mol$^{-1}$ and 0.512 K kg mol$^{-1}$ respectively.

Write IUPAC names of the following coordination compounds:
$[ \text{CoCl}_2(\text{en})_2]\text{SO}_4 $
(ii) $ \text{K}_3[\text{Fe}(\text{C}_2\text{O}_4)_3] $
(ii) Didentate ligand and Ambidentate ligand

The expressions for the vapour pressure of solid ($ p_1 $) and vapour pressure of liquid ($ p_2 $) phases of a pure substance, respectively, are \[ \ln p_1 = \frac{-2000}{T} + 5 \quad {and} \quad \ln p_2 = \frac{-4000}{T} + 10 \] The triple point temperature of this substance is __________ K (in integer).

The ratio of the fundamental vibrational frequencies $ \left( \nu_{^{13}C^{16}O} / \nu_{^{12}C^{16}O} \right) $ of two diatomic molecules $ ^{13}C^{16}O $ and $ ^{12}C^{16}O $, considering their force constants to be the same, is ___________ (rounded off to two decimal places).

The specific rotation of enantiomerically pure (S)-2-butanol is $ +14^\circ $. The specific rotation of the enantiomeric mixture of 2-butanol obtained from an asymmetric reduction of 2-butanone is found to be $ +7^\circ $. The percentage of (R)-2-butanol present in the reaction mixture is ____________ (in integer).}

Partial hydrolysis of a pentapeptide yields all possible tripeptides and dipeptides. The dipeptides that are obtained upon hydrolysis are given below: Val-Ala Gln-His Phe-Val Ala-Gln
The total number of tripeptides obtained that contain ‘Ala’ as one of the amino acids is __________

Xe and F₂ in 1:1 molar ratio when mixed in a closed flask and kept in sunlight for a day, gave white crystals of a compound Q. Two equivalents of Q on reaction with one equivalent of AsF₅ gave an ionic compound X⁺Y^– with the cation having two Xe atoms. The total number of lone pairs present on the cation X⁺ is ___________ (in integer).

Consider the two $ pK_a $ values of valine as 2.32 and 9.62. The isoelectric point (pI) of this amino acid is ....... (rounded off to two decimal places)