JEE Main 2015 — Physical Chemistry

A variable, the opposite external potential $({E}_{\mathrm{ext}})$ is applied to the cell $Zn | Z{n}^{2+} (1M)\parallel C{u}^{2+} (1 M)| Cu$, of potential $1.1V$. When ${E}_{ext}<1.1 V$ and ${E}_{ext}>1.1 V$, respectively electrons flow from

An element $X$ shows $+3$, oxidation state in its compounds. Out of the four compounds given below, choose the incorrect formula for the element $X$.

At temperature $T$, the average kinetic energy of any particle is $\frac{3}{2}\mathrm{kT}$. The de Broglie wavelength follows the order:

At $298K$, the standard reduction potentials are $1.51V$ for ${MnO}_{4}^{-} | M{n}^{2+}$, $1.36V$ for $C{l}_{2}|C{l}^{-}$, $1.07V$ for $B{r}_{2}|B{r}^{-}$, $0.54V$ for ${I}_{2}|{I}^{-}$. At $\mathrm{pH}=3$, permanganate is expected to oxidize: $(\frac{RT}{F}=0.059)$

Determination of the molar mass of acetic acid in benzene using freezing point depression is affected by:

For the equilibrium, $A(g)\rightleftharpoons B(g), \Delta H\mathrm{is}-40\mathrm{kJ}/\mathrm{mol}$ . If the ratio of the activation energies of the forward $({E}_{f})$ and reverse $({E}_{b})$ reactions is $\frac{2}{3}$ then:

Gaseous ${N}_{2}{O}_{4}$ dissociates into gaseous $N{O}_{2}$ according to the reaction ${N}_{2}{O}_{4}(g)\rightleftharpoons 2N{O}_{2}(g)$ At $300K$ and $1\mathrm{atm}$ pressure, the degree of dissociation of ${N}_{2}{O}_{4}$ is $0.2$. If one mole of ${N}_{2}{O}_{4}$ gas is contained in a vessel, then the density of the equilibrium mixture is$:$

Higher order (>3) reactions are rare due to:

If the principal quantum number $\text{n}=6,$ the correct sequence of filling of electrons will be:

In the following reaction: $A+2B+3C\rightleftharpoons A{B}_{2}{C}_{3}$ $6.0g$ of $A$, $6.0\times {10}^{23}$ atoms of $B$ and $0.036\mathrm{mol}$ of $C$ reacted and formed $4.8g$ of compound $A{B}_{2}{C}_{3}$. If the atomic mass of $A$ and $C$ are $60$ and $80\mathrm{amu}$, respectively. What is the atomic mass of $B$ in $\mathrm{amu}$? (Avogadro number$=6\times {10}^{23}$)

The following reaction is performed at $298K$. $2NO(g)+{O}_{2}(g)\rightleftharpoons 2N{O}_{2}(g)$ The standard free energy of the formation of $NO(g)$ is $86.6\mathrm{kJ}{\mathrm{mol}}^{-1}$ at $298K$. What is the standard free energy of the formation of $N{O}_{2}(g)$ at $298K$? $({K}_{P}=1.6\times {10}^{12})$

The heat of atomization of methane and ethane are $360\mathrm{kJ}{\mathrm{mol}}^{-1}$ and $620\mathrm{kJ}{\mathrm{mol}}^{-1}$, respectively. The longest wavelength of light capable of breaking the $C-C$ bond is (Avogadro's number$=6.023\times {10}^{23}, h=6.62\times {10}^{-34} J s$)

The increase of pressure on $ice \rightleftharpoons water$ system at constant temperature will lead to:

The molecular formula of a commercial resin used for exchanging ions in water softening is ${C}_{8}{H}_{7}S{O}_{3}Na$ $(\mathrm{molecular}\mathrm{weight}=206)$. What would be the maximum uptake of $C{a}^{2+}$ ions by the resin if expressed in $\mathrm{mol}$ per $\mathrm{gm}$?

$A+2B\rightarrow C$ , the rate equation for the reaction is given as Rate $=k[A][B]$ If the concentration of A is kept the same but that of B is doubled what will happen to the rate itself?

The reaction $2{N}_{2}{O}_{5}(g)\rightarrow 4N{O}_{2}(g)+{O}_{2}(g)$ follows first order kinetics. The pressure of a vessel containing only ${N}_{2}{O}_{5}$ was found to increase from 50 mm Hg to 87.5 mm Hg in 30 min. The pressure exerted by the gases after 60 min. Will be (Assume temperature remains constant) :

The standard Gibbs energy change at 300 K for the reaction $2A\rightleftharpoons B+C$ is 2494.2 J. At a given time, the composition of the reaction mixture is $[A]=\frac{1}{2}, [B]=2$ and $[C]=\frac{1}{2}$ . The reaction proceeds in the: $[R=8.314 J/K-mol , e=2.718]$ {Given antilog (-0.44)=0.36}

The vapour pressure of acetone at ${20}^{o}C$ is $185\mathrm{torr}$. When $1.2g$ of a non-volatile substance was dissolved in $100g$ of acetone at ${20}^{o}C$ , its vapour pressure was $183\mathrm{torr}$. The molar mass $(g mo{l}^{-1})$ of the substance is:

Two Faraday of electricity is passed through a solution of $CuS{O}_{4}$ . The mass of copper deposited at the cathode is: (Atomic mass of Cu = 63.5 amu)

Which of the following is the energy of a possible excited state of hydrogen?