List of top Chemistry Questions on Physical Chemistry

Which of the following solutions will show negative deviation from Raoult's law?
Calculate the mass of ascorbic acid \((\mathrm{C_6H_8O_6})\) to be dissolved in \(75\) g of acetic acid to lower its melting point by \(1.5^\circ \mathrm{C}\). \(K_f = 3.9\ \mathrm{K\ kg\ mol^{-1}}\); \(H = 1,\ C = 12,\ O = 16\ amu\)
For the ideal solutions, which of the following condition is suitable?
The molarity of solution containing 15 g of NaOH in 900 ml solution will be ______.
\(80\,\text{mL}\) of an organic compound is mixed with \(264\,\text{mL}\) of \(O_2\) and ignited. It gives \(224\,\text{mL}\) of gaseous mixture at NTP. After passing through KOH, \(64\,\text{mL}\) of gas remains. The organic compound is:
Consider the following reaction: \[ {Ca + 2HCl → CaCl2 + H2} \] If \(14\,\text{g}\) of calcium reacts with excess \( {HCl} \), choose the {incorrect} option.
Prove that in case of first order reaction t₉₉.₉% = 10 t₁/₂
List any three characteristics of catalysts.
Calculate the pH of 1.5 × 10⁻³ M solution of Ba(OH)₂.
Write the rate law for the reaction in which the order with respect to the reactants X, Y and Z are 1/2, 3/2 and zero respectively.
The molar conductivity of a 0.5 mol dm⁻³ solution of AgNO₃ with specific conductance 5.76 × 10⁻³ S cm⁻¹ at 298 K is:
The half life period of a radioactive element is 140 days. After 560 days 1 g of element reduced to:
The pH of sodium formate solution in terms of Kₐ and the concentration of the electrolyte C is:
For an ideal gas, which of the following thermodynamic quantities depends only on temperature?

\(1\,\text{g}\) of \( \mathrm{AB_2} \) is dissolved in \(50\,\text{g}\) of a solvent such that \( \Delta T_f = 0.689\,\text{K} \). When \(1\,\text{g}\) of \( \mathrm{AB} \) is dissolved in \(50\,\text{g}\) of the same solvent, \( \Delta T_f = 1.176\,\text{K} \). Find the molar mass of \( \mathrm{AB_2} \). Given \( K_f = 5\,\text{K kg mol}^{-1} \). \((\textit{Report to nearest integer.})\) Both \( \mathrm{AB_2} \) and \( \mathrm{AB} \) are non-electrolytes.

25 ml, 0.1 M Ba(OH)$_2$ react completely with HCl. Find the weight of HCl (in milligram) required?
In a mixture of liquids A and B, if the mole fractions of component A in vapour phase and liquid mixture are \(x_1\) and \(x_2\) respectively, then the total vapour pressure of liquid mixture is (where P\(_A^0\) and P\(_B^0\) are the vapour pressures of pure A and B)
The correct statements about the properties of colloidal solutions are
A. Tyndall effect is used to distinguish between a colloidal solution and a true solution
B. Zeta potential is related to movement of colloidal particles
C. Brownian motion in colloidal solution is faster if the viscosity of the solution is very high
D. Brownian motion stabilises the sols
R\(\rightarrow\)P is a first order reaction. For this reaction a graph of ln[R] (on y-axis) and time (on x-axis) gave a straight line with negative slope. The intercept on y-axis is equal to (k=rate constant)
A current of 0.5 ampere is passed through molten AlCl\(_3\) for 96.5 seconds. The mass of aluminium deposited at cathode is x mg and volume of chlorine liberated (at STP) at anode is y mL. x and y are respectively
Sodium metal crystallises in a body centred cubic lattice with edge length of x Å. If the radius of sodium atom is 1.86 Å, the value of x is
The volume of water required to dissolve 0.1 g PbCl\(_2\) to get a saturated solution (in mL) is (Given K\(_{sp}\)(PbCl\(_2\)) = \(3.2 \times 10^{-8}\); Atomic mass of Pb = 207u)
The force (F) required to maintain the flow of layers of a liquid is equal to (A = area of contact of layers, dz = distance between the layers, du = change in velocity, \(\eta\) = coefficient of viscosity)
Which of the following is not correct about Freundlich adsorption isotherm?
Observe the following statements.
Statement - I: The boiling point of 0.1 M urea solution is less than that of 0.1 M KCl solution.
Statement - II: Elevation of boiling point is inversely proportional to molar mass of solute.
The correct answer is