List of top Chemistry Questions

An aqueous solution of CuSO4 solution is electrolyzed for 193 s with a current of 2.5 amp. Given that the atomic mass of Cu is 63.5 and \( F = 96500 \) coulombs, the amount of copper deposited at the anode is
18 g of glucose was dissolved in 360 g of water. The vapor pressure of the solution at 100°C will be
A colloidal solution is subjected to an electric field. The colloidal particles move toward the anode. In the coagulation of this solution using NaCl, BaCl2, and AlCl3 separately, which one is the correct order of coagulation power?
3 moles of an ideal gas expands isothermally against a constant pressure of 2 Pascal from 20 L to 60 L. The amount of work involved is
The molar conductivity \( \Lambda^0_m \) at infinite dilution for HCl, NaCl, and \( \text{CH}_3\text{COONa} \) at 25°C are 426, 126, and 91 S cm\(^2\) respectively. The \( \Lambda^0_m \) for acetic acid at the same temperature will be
For which of the following is the adsorption theory applicable?
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).
Energy of the transition from \( n_h = 4 \) to \( n_l = 2 \) for hydrogen atom is \( E \times 10^3 \) cm\(^{-1}\).
Given: Rydberg constant for hydrogen: \( 1.097 \times 10^7 \, {m}^{-1} \)
Value of E is ............... (rounded off to two decimal places)
A non-volatile solute has a molecular weight of 180 g mol\(^{-1}\). Assume that the solute does not associate or dissociate in water, and the boiling-point constant (ebullioscopic constant) of water is 0.51 K kg mol\(^{-1}\).
The amount (in g) of solute added to 500 g of water to elevate the boiling point by 0.153 K is ............... (answer 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)
The standard potentials (\( E^\circ \)) for the Fe\(^{3+}\)/Fe and Fe\(^{3+}\)/Fe\(^{2+}\) couples are -0.04 V and +0.76 V, respectively.
Given: Faraday constant = 96500 C mol\(^{-1}\)
The value for \( E^\circ \) (Fe\(^{2+}\)/Fe) in V is ............... (rounded off to two decimal places)
If a molecule emitting a radiation of frequency \(3.100 \times 10^9\) Hz approaches an observer with a relative speed of \(5.000 \times 10^6\) m s\(^{-1}\), then the observer detects a frequency of ___________ \( \times 10^9 \) Hz. (rounded off to three decimal places) [Given: Speed of light \(c = 3.000 \times 10^8\) m s\(^{-1}\)]
The kinetic energies of an electron (\(e\)) and a proton (\(p\)) are \(E\) and \(3E\), respectively. Given that the mass of a proton is 1836 times that of an electron, the ratio of their de Broglie wavelengths (\(\lambda_e / \lambda_p\)) is ___________ (rounded off to two decimal places).
In the following reaction, 13.4 grams of aldehyde P gave a diastereomeric mixture of alcohols Q and R in a ratio of 2:1. If the yield of the reaction is 80 percent, then the amount of Q (in grams) obtained is ___________ (in integer). \begin{center} \includegraphics{59.png} \end{center}
An archaeological specimen containing \(^{14}\)C gives 45 counts per gram of carbon in 5 minutes. A specimen of freshly cut wood gives 20 counts per gram of carbon per minute. The counter used recorded a background count of 5 counts per minute in the absence of any \(^{14}\)C containing sample. The age of the specimen is ___________ years (in integer). [Note: \(t_{1/2}\) of \(^{14}\)C = 5730 years]
Consider a Carnot engine with a hot source kept at 500 K. From the hot source, 100 J of energy (heat) is withdrawn at 500 K. The cold sink is kept at 300 K. The efficiency of the Carnot engine is ___________ (rounded off to one decimal place).
For the cell reaction, \[ Hg_2Cl_2 (s) + H_2 (1 \, {atm}) \rightarrow 2Hg (l) + 2H^+ (a=1) + 2Cl^- (a=1) \] The standard cell potential is \( \mathcal{E}^0 = 0.2676 \) V, and \( \left(\frac{\partial \mathcal{E}^0}{\partial T}\right)_P = -3.19 \times 10^{-4} \) V K\(^{-1}\). The standard enthalpy change of the reaction (\( \Delta_r H^0 \)) at 298 K is \( -x \) kJ mol\(^{-1}\). The value of \( x \) is ___________ (rounded off to two decimal places). [Given: Faraday constant \( F = 96500 \) C mol\(^{-1}\)]
The mean energy of a molecule having two available energy states at \( \epsilon = 0 \) J and \( \epsilon = 4.14 \times 10^{-21} \) J at 300 K is ___________ \( \times 10^{-21} \) J (rounded off to two decimal places). [Given: Boltzmann constant \( k_B = 1.38 \times 10^{-23} \) J K\(^{-1}\)]
The total number of hyperfine lines expected in the EPR spectrum of \(\cdot\)CHsubscript{2OH (radical) is ___________ (in integer).}
Calculate the mass in kg of 4.48 dm$^3$ carbon dioxide at STP.