Physical Chemistry PYQ — Page 7

The oxidation number of the underlined atom in the following species (Identify the incorrect statement)

Identify the reaction from following having top position in EMF series (Std.red. potential) according to their electrode potential at $298K.$

The calculated spin only magnetic moment of ${\mathrm{Cr}}^{2+}$ ion is

Which one of the following reactions does not come under hydrolysis type reaction?

The correct option for free expansion of an ideal gas under adiabatic condition is

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 number of angular nodes and radial nodes in $3s$ orbital are

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 $114g{\mathrm{mol}}^{-1}$]

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 :

For a reaction, activation energy $\mathrm{E}_{\mathrm{a}}=0$ and the rate constant at $200 \mathrm{~K}$ is $1.6 \times 10^6 \mathrm{~s}^{-1}$. The rate constant at $400 \mathrm{~K}$ will be [Given that gas constant $\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$ ]

Which of the following reactions are disproportionation reaction? $(a)$ $2C{u}^{+}\rightarrow C{u}^{2+}+C{u}^{0}$ $(b)$ $3Mn{O}_{4}^{2-}+4{H}^{+}\rightarrow 2Mn{O}_{4}^{-}+Mn{O}_{2}+2{H}_{2}O$ $(c)$ $2KMn{O}_{4}\overset{\Delta }{\rightarrow }{K}_{2}Mn{O}_{4}+Mn{O}_{2}+{O}_{2}$ $(d)$ $2Mn{O}_{4}^{-}+3M{n}^{2+}+2{H}_{2}O\rightarrow 5Mn{O}_{2}+4{H}^{\oplus }$ Select the correct option from the following:

In which case change in entropy is negative?

Which of the following statements is correct regarding a solution of two compounds A and $\mathrm{B}$ exhibiting positive deviation from ideal behaviour?

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

An ideal gas expands isothermally from $10^{-3} \mathrm{~m}^3$ to $10^{-2} \mathrm{~m}^3$ at $300 \mathrm{~K}$ against a constant pressure of $10^5 \mathrm{Nm}^{-2}$. The work done on the gas is

Following limiting molar conductivities are given as given as $$ \begin{aligned} & \lambda_{\mathrm{m}\left(\mathrm{H}_2 \mathrm{SO}_4\right)}^0=\mathrm{x} \mathrm{S} \mathrm{cm}{ }^2 \mathrm{~mol}^{-1} \\ & \lambda_{\mathrm{m}\left(\mathrm{K}_2 \mathrm{SO}_4\right)}^0=\mathrm{y} \mathrm{S} \mathrm{cm}{ }^2 \mathrm{~mol}^{-1} \\ & \end{aligned} $$ $\lambda_{\mathrm{m}\left(\mathrm{CH}_2 \mathrm{COOK}\right)}^0=\mathrm{Z} \mathrm{S} \mathrm{cm}{ }^2 \mathrm{~mol}^{-1}$

Which of the following cannot act both as Bronsted acid and as Bronsted base?

For the cell reaction $2F{e}^{3+}(aq)+2{I}^{-}(aq)\rightarrow 2F{e}^{2+}(aq)+{I}_{2}(aq)$ ${E}_{cell}^{0}=0.24 V$ at $298 K.$ The standard Gibbs energy $({\Delta }_{r}{G}^{-})$ of the cell reaction is: [Given that Faraday constant $F=96500 Cmo{l}^{-1}$ ]

In water saturated air the mole fraction of water vapour is 0.02 . If the total pressure of the saturated air is $1.2 \mathrm{~atm}$, the partial pressure of dry air is

A first order reaction has a rate constant of $2.303 \times 10^{-3} \mathrm{~s}^{-1}$. The time required for $40 \mathrm{~g}$ of this reactant to reduce to $10 \mathrm{~g}$ will be [Given that $\log _{10} 2=0.3010$ ]

Orbital having 3 angular nodes and 3 total nodes is

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$=100 J$)