NEET UG Chemistry — Physical Chemistry previous year questions with solutions.
The molar conductivity of $0.007M$ acetic acid is $20S{\mathrm{cm}}^{2}{\mathrm{mol}}^{-1}.$ What is the dissociation constant of acetic acid? Choose the correct option. ${\lambda }_{{H}^{+}}^{\circ }=350S{\mathrm{cm}}^{2}{\mathrm{mol}}^{-1} {\lambda }_{{\mathrm{CH}}_{3}{\mathrm{COO}}^{-}}^{\circ }=50S{\mathrm{cm}}^{2}{\mathrm{mol}}^{-1}$
The unit of rate constant for zero order reaction is
Which one among the following is the correct option for right relationship between ${C}_{p}$ and ${C}_{v}$ for one mole of ideal gas?
The slope of Arrhenius Plot $(\mathrm{lnk}\text{ v/s }\frac{1}{T})$ of first order reaction is $-5\times {10}^{3}K.$ The value of ${E}_{a}$ of the reaction is. Choose the correct option for your answer. [Given $R=8.314J{K}^{-1}{\mathrm{mol}}^{-1}$]
The molar conductance of $\mathrm{NaCl},\mathrm{HCl}$ and ${\mathrm{CH}}_{3}\mathrm{COONa}$ at infinite dilution are $126.45,426.16$ and $91.0{\mathrm{Scm}}^{2}{\mathrm{mol}}^{-1}$ respectively. The molar conductance of ${\mathrm{CH}}_{3}\mathrm{COOH}$ at infinite dilution is. Choose the right option for your answer.
Which of the following reactions is the metal displacement reaction? Choose the right option.
The number of angular nodes and radial nodes in $3s$ orbital are
The potential energy $(y)$ curve for ${H}_{2}$ formation as a function of internuclear distance $(x)$ of the $H$ atoms is shown below.  The bond energy of ${H}_{2}$ is :
The calculated spin only magnetic moment of ${\mathrm{Cr}}^{2+}$ ion is
If $8g$ of a non-electrolyte solute is dissolved in $114g$ of $n-$octane to reduce its vapour pressure to $80%,$ the molar mass (in $g{\mathrm{mol}}^{-1}$) of the solute is [Given that molar mass of n-octane is $114g{\mathrm{mol}}^{-1}$]
The number of Faradays(F) required to produce $20 g$ of calcium from molten ${\mathrm{CaCl}}_{2}$ (Atomic mass of $\mathrm{Ca}=40 g{\mathrm{mol}}^{–1}$) is
An increase in the concentration of the reactants of a reaction leads to change in
For the reaction, $2\mathrm{Cl}(g)\rightarrow {\mathrm{Cl}}_{2}(g)$, the correct option is
In collision theory of chemical reaction, ${Z}_{\mathrm{AB}}$ represents
The solubility product for a salt of the type $\mathrm{AB}$ is $4\times {10}^{-8}.$ What is the molarity of its saturated solution?
Isotonic solutions have same
Identify the reaction from following having top position in EMF series (Std.red. potential) according to their electrode potential at $298K.$
The correct option for free expansion of an ideal gas under adiabatic condition is
Find out the solubility of $\mathrm{Ni}{(\mathrm{OH})}_{2}$ in $0.1 M\mathrm{NaOH}$. Given that the ionic product of $\mathrm{Ni}{(\mathrm{OH})}_{2}$ is $2\times {10}^{–15}$.
One mole of carbon atom weighs $12g$, the number of atoms in it is equal to, (Mass of carbon $-12$ is $1.9926\times {10}^{-23}g)$
If for a certain reaction ${\Delta }_{r}H$ is $30{\mathrm{kJmol}}^{-1}$ at $450K,$ the value of ${\Delta }_{r}S$ (in ${\mathrm{JK}}^{-1}{\mathrm{mol}}^{-1}$) for which the same reaction will be spontaneous at the same temperature is
The freezing point depression constant $({K}_{f})$ of benzene is $5.12 K \mathrm{kg} {\mathrm{mol}}^{–1}$. The freezing point depression for the solution of molality $0.078 m$ containing a non-electrolyte solute in benzene is (rounded off upto two decimal places):
In a typical fuel cell, the reactants (R) and product (P) are :-
What is the change in oxidation number of carbon in the following reaction? ${\mathrm{CH}}_{4}(g)+4{\mathrm{Cl}}_{2}(g)\rightarrow {\mathrm{CCl}}_{4}+4\mathrm{HCl}(g)$