List of top Chemistry Questions

Consider the depicted hydrogen (H) in the hydrocarbons given below. The most acidic hydrogen (H) is:

Considering ideal gas behavior, the expansion work done (in kJ) when 144 g of water is electrolyzed completely under constant pressure at 300 K is ____. Use: Universal gas constant $ R = 8.3 \, \text{J K}^{-1} \text{mol}^{-1} $; Atomic mass (in amu): H = 1, O = 16

The monomer (X) involved in the synthesis of Nylon 6,6 gives positive carbylamine test. If 10 moles of X are analyzed using Dumas method, the amount (in grams) of nitrogen gas evolved is ____. Use: Atomic mass of N (in amu) = 14

The reaction sequence given below is carried out with 16 moles of X. The yield of the major product in each step is given below the product in parentheses. The amount (in grams) of S produced is ____.

Use: Atomic mass (in amu): H = 1, C = 12, O = 16, Br = 80

The correct match of the group reagents in List-I for precipitating the metal ion given in List-II from solutions is:

List-I	List-II
(P) Passing H₂S in the presence of NH₄OH	(1) Cu²⁺
(Q) (NH₄)₂CO₃ in the presence of NH₄OH	(2) Al³⁺
(R) NH₄OH in the presence of NH₄Cl	(3) Mn²⁺
(S) Passing H₂S in the presence of dilute HCl	(4) Ba²⁺ (5) Mg²⁺

The major products obtained from the reactions in List-II are the reactants for the named reactions mentioned in List-I. Match each entry in List-I with the appropriate entry in List-II and choose the correct option.

Match the compounds in List-I with the appropriate observations in List-II and choose the correct option.

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

Molar volume ($ V_m $) of a van der Waals gas can be calculated by expressing the van der Waals equation as a cubic equation with $ V_m $ as the variable. The ratio (in mol dm$^{-3}$) of the coefficient of $ V_m^2 $ to the coefficient of $ V_m $ for a gas having van der Waals constants $ a = 6.0 \, \text{dm}^6 \, \text{atm mol}^{-2} $ and $ b = 0.060 \, \text{dm}^3 \, \text{mol}^{-1} $ at 300 K and 300 atm is ____. Use: Universal gas constant $ R = 0.082 \, \text{dm}^3 \, \text{atm mol}^{-1} \, \text{K}^{-1} $

In an electrochemical cell, dichromate ions in aqueous acidic medium are reduced to $ \text{Cr}^{3+} $. The current (in amperes) that flows through the cell for 48.25 minutes to produce 1 mole of $ \text{Cr}^{3+} $ is ____. {Use: 1 Faraday $ = 96500 \, \text{C mol}^{-1} $

Calculate the standard Gibbs energy ($ \Delta G^\circ $) of the following reaction at 25°C: \[ \text{Au}(s) + \text{Ca}^{2+}(1M) \to \text{Au}^{3+}(1M) + \text{Ca}(s) \] \[ E^\circ_{\text{Au}^{3+}/\text{Au}} = +1.5 \, \text{V}, \quad E^\circ_{\text{Ca}^{2+}/\text{Ca}} = -2.87 \, \text{V} \] Predict whether the reaction will be spontaneous or not at 25°C. [1 F = 96500 C mol$^{-1}$]

In neutral medium, permanganate reacts with iodide to give:

What are the gases released when $\mathrm{NH_4NO_2}$ and $\mathrm{NH_4NO_3}$ are heated?

Calculate the sum of magnetic moments (in Bohr Magnetons, B.M.) of the complexes: \[ [\mathrm{MnCl}_6]^{3-} \quad \text{and} \quad [\mathrm{Mn(CN)}_6]^{3-} \]

Which of the following ions are diamagnetic?

Calculate the density of a solid (g/ml) with a CCP (Cubic close packed) structure. The edge length of unit cell is 400 pm. The molar mass of solid is 105.6 g/mol.

The hydrolysis products of $\mathrm{ICl}$, $\mathrm{ClF_3}$, and $\mathrm{BrF_5}$ are respectively:

Which of the following statements is/are true about equilibrium?

Total pressure of the solution is 500, the partial pressure of component A is 400, and the partial pressure of component B is 575. What is the mole fraction of component B?

Assertion (A): The boiling point of ethanol is higher than that of methoxymethane.
Reason (R): There is intramolecular hydrogen bonding in ethanol.

Energy and radius of first Bohr orbit of He$^+$ and Li$^2+$ are:
Given: $ R_H = 2.18 \times 10^{-18} \, \text{J}, a_0 = 52.9 \, \text{pm} $

For the thermal decomposition of $ N_2O_5(g) $ at constant volume, the following table can be formed, for the reaction mentioned below: \[ 2 N_2O_5(g) \rightarrow 2 N_2O_4(g) + O_2(g) \] Given: Rate constant for the reaction is $ 4.606 \times 10^{-2} \text{ s}^{-1} $.

O$_2$ gas will be evolved as a product of electrolysis of:
(A) an aqueous solution of AgNO3 using silver electrodes.
(B) an aqueous solution of AgNO3 using platinum electrodes.
(C) a dilute solution of H2SO4 using platinum electrodes.
(D) a high concentration solution of H2SO4 using platinum electrodes.
Choose the correct answer from the options given below :

Atoms with low ionization potential and large atomic size:

Which type of atoms form cations easily?