NEET UG Chemistry — Physical Chemistry previous year questions with solutions.
Hydrolysis of sucrose is given by the following reaction. Sucrose $+{H}_{2}O\rightleftharpoons$ Glucose $+$ Fructose If the equilibrium constant $({K}_{C})$ is $2\times {10}^{13}$ at $300 K$, the value of ${\Delta }_{r}{G}^{\ominus }$ at the same temperature will be:
At standard conditions, if the change in the enthalpy for the following reaction is $-109{\mathrm{kJmol}}^{-1}$ ${H}_{2(g)}+{\mathrm{Br}}_{2(g)}\rightarrow 2{\mathrm{HBr}}_{(g)}$ Given that bond energy of ${H}_{2}$ and ${\mathrm{Br}}_{2}$ is $435{\mathrm{kJmol}}^{-1}$ and $192{\mathrm{kJmol}}^{-1}$, respectively, what is the bond energy (in $\mathrm{kJ}{\mathrm{mol}}^{-1}$) of $\mathrm{HBr}?$
$\mathrm{HCl}$ was passed through a solution of ${\mathrm{CaCl}}_{2}$, ${\mathrm{MgCl}}_{2}$ and $\mathrm{NaCl}$. Which of the following compound(s) crystallise(s)?
The number of protons, neutrons and electrons in ${}_{71}^{175}\mathrm{Lu}$, respectively, are
The oxidation number of the underlined atom in the following species (Identify the incorrect statement)
Which one of the following reactions does not come under hydrolysis type reaction?
The half-life for a zero order reaction having $0.02M$ initial concentration of reactant is $100s$. The rate constant (in $\mathrm{mol}{L}^{-1}{s}^{-1}$) for the reaction is
Which one of the followings has maximum number of atoms?
The mixture which shows positive deviation from Raoult’s law is
Which among the following salt solutions is basic in nature?
The rate constant for a first order reaction is $4.606\times {10}^{–3} {s}^{–1}$. The time required to reduce $2.0 g$ of the reactant to $0.2 g$ is :
The mixture that forms maximum boiling azeotrope is
Following limiting molar conductivities are given as given as $$ \begin{aligned} & \lambda_{\mathrm{m}\left(\mathrm{H}_2 \mathrm{SO}_4\right)}^0=\mathrm{x} \mathrm{S} \mathrm{cm}{ }^2 \mathrm{~mol}^{-1} \\ & \lambda_{\mathrm{m}\left(\mathrm{K}_2 \mathrm{SO}_4\right)}^0=\mathrm{y} \mathrm{S} \mathrm{cm}{ }^2 \mathrm{~mol}^{-1} \\ & \end{aligned} $$ $\lambda_{\mathrm{m}\left(\mathrm{CH}_2 \mathrm{COOK}\right)}^0=\mathrm{Z} \mathrm{S} \mathrm{cm}{ }^2 \mathrm{~mol}^{-1}$
The oxidation state of $\mathrm{Cr}$ in $\mathrm{CrO}_5$ is
The density of $2 \mathrm{M}$ aqueous solution of $\mathrm{NaOH}$ is $1.28 \mathrm{~g} / \mathrm{cm}^3$. The molality of the solution is [Given that molecular mass of $\left.\mathrm{NaOH}=40 \mathrm{~g} \mathrm{~mol}^{-1}\right]$
If the rate constant for a first order reaction is $k$, the time $(t)$ required for the completion of $99%$ of the reaction is given by
For the chemical reaction ${N}_{2}(g)+3{H}_{2}(g)\rightleftharpoons 2N{H}_{3}(g)$, the correct option is:
Which of the following cannot act both as Bronsted acid and as Bronsted base?
The molar solubility of $\mathrm{CaF}_2$ $\left(\mathrm{K}_{\mathrm{sp}}=5.3 \times 10^{-11}\right)$ in $0.1 \mathrm{M}$ solution of $\mathrm{NaF}$ will be
Under the isothermal condition, a gas at $300 K$ expands from $0.1 L$ to $0.25 L$ against a constant external pressure of $2$ bar. The work done by the gas is (Given that $1 L$ bar$=100 J$)
Conjugate base for Bronsted acids ${\text{H}}_{2} \text{O}$ and $\text{HF}$ are:
Which of the following statements is correct regarding a solution of two compounds A and $\mathrm{B}$ exhibiting positive deviation from ideal behaviour?
For an ideal solution, the correct option is:
The standard electrode potential $\left(\mathrm{E}^{-}\right)$values of $\left(\mathrm{Al}^{3+} / \mathrm{Al}, \mathrm{Ag}^{+} / \mathrm{Ag}, \mathrm{K}^{+} / \mathrm{K}\right.$ and $\mathrm{Cr}^{3+} / \mathrm{Cr}$ are $-1.66 \mathrm{~V}, 0.80 \mathrm{~V}, 2.93 \mathrm{~V}$ and $-0.74 \mathrm{~V}$, respectively. The correct decreasing order of reducing power of the metal is