Physical Chemistry PYQ — Page 18

The equivalent conductance of $\frac{\mathrm{M}}{32}$ solution of a weak monobasic acid is $8.0 \mathrm{~mho~} \mathrm{cm}^2$ and at infinite dilution is $400 \mathrm{~mho~} \mathrm{cm}^2$. The dissociation constant of this acid is

The equivalent conductance of $\frac{M}{32}$ solution of a weak monobasic acid is 8.0 mho $\mathrm{cm}^2$ and at infinite dilution is 400 mho $\mathrm{cm}^2$, The dissociation constant of this acid is -

For the reaction, $\mathrm{N}_2+3 \mathrm{H}_2 \longrightarrow 2 \mathrm{NH}_3$, if $\frac{\mathrm{d}\left[\mathrm{NH}_3\right]}{\mathrm{dt}}=2 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$, the value of $\frac{-\mathrm{d}\left[\mathrm{H}_2\right]}{\mathrm{dt}}$ would be

A $0.0020 \mathrm{M}$ aqueous solution of an ionic compound $\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{NO}_2\right) \mathrm{Cl}$ freezes at $-0.00732^{\circ} \mathrm{C}$. Number of moles of ions which 1 mole of ionic compound produces on being dissolved in water will be : $\left(\mathrm{k}_{\mathrm{f}}=1.86^{\circ} \mathrm{C} / \mathrm{m}\right)$ -

A $0.0020 \mathrm{~m}$ aqueous solution of an ionic compound $\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{NO}_2\right) \mathrm{Cl}$ freezes at $-0.00732^{\circ} \mathrm{C}$. Number of moles of ions which $1 \mathrm{~mol}$ of ionic compound produces on being dissolved in water will be $\left(\mathrm{k}_{\mathrm{f}}=-1.86^{\circ} \mathrm{C} / \mathrm{m}\right)$

Which of the following is not permissible arrangement of electrons in an atom ?

For the reaction, $\mathrm{N}_2+3 \mathrm{H}_2 \rightarrow 2 \mathrm{NH}_3$, If $\frac{\mathrm{d}\left[\mathrm{NH}_3\right]}{\mathrm{dt}}=2 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$, The value of $\frac{-\mathrm{d}\left[\mathrm{H}_2\right]}{\mathrm{dt}}$ would be -

$10 \mathrm{~g}$ of hydrogen and $64 \mathrm{~g}$ of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be -

For the reaction, $A+B \rightarrow$ products, it is observed that (1) On doubling the initial concentration of $A$ only, the rate of reaction is also doubled and (2) On doubling the initial concentrations of both $A$ and $B$, there is a change by a factor of 8 in the rate of the reaction. The rate of this reaction is, given by

The energy absorbed by each molecule $\left(A_2\right)$ of a substance is $4.4 \times 10^{-19} \mathrm{~J}$ and bond energy per molecule is $4.0 \times 10^{-19} \mathrm{~J}$. The kinetic energy of the molecule per atom will be

Which of the following oxides is not expected to react with sodium hydroxide ?

Half-life period of a first-order reaction is 1386 seconds. The specific rate constant of the reaction is :

Maximum number of electrons in a subshell or an atom is determined by the following :

Maximum number of electrons in a subshell of an atom is determined by the following

$\mathrm{Al}_2 \mathrm{O}_3$ is reduced by electrolysis at low potentials and high currents. If $4.0 \times 10^4$ amperes of current is passed through molten $\mathrm{Al}_2 \mathrm{O}_3$ for 6 hours, what mass of aluminium is produced ? (Assume 100\% current efficiency, at. mass of $\mathrm{Al}=27 \mathrm{~g} \mathrm{~mol}^{-1}$ ) -

In the reaction, \(\mathrm{BrO}_3^{-}\)(aq.) \(+5 \mathrm{Br}^{-}\)(aq.) \(+6 \mathrm{H}^{+}\)(aq.) \(\rightarrow 3 \mathrm{Br}_2(\mathrm{l})+3 \mathrm{H}_2 \mathrm{O}\) (l) .The rate of appearance of bromine $\left(\mathrm{Br}_2\right)$ is related to rate of disappearance of bromide ions as following

The ionization constant of ammonium hydroxide is $1.77 \times 10^{-5}$ at $298 \mathrm{~K}$. Hydrolysis constant of ammonium chloride -

The energy absorbed by each molecule $\left(\mathrm{A}_2\right)$ of a substance is $4.4 \times 10^{-19} \mathrm{~J}$ and bond energy per molecule is $4.0 \times 10^{-19} \mathrm{~J}$. The kinetic energy of the molecule per atom will be :

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states ?

Equal volumes of three acid solutions of $\mathrm{pH} 3,4$ and 5 are mixed in a vessel. What will be the $\mathrm{H}^{+}$ion concentration in the mixture?

If the concentration of $\mathrm{OH}^{-}$ions in the reaction $\mathrm{Fe}(\mathrm{OH})_3(\mathrm{~s}) \rightleftharpoons \mathrm{Fe}^{3+}(\mathrm{aq})+3 \mathrm{OH}^{-}(\mathrm{aq})$ is decreased by $\frac{1}{4}$ times, then equilibrium concentration of $\mathrm{Fe}^{3+}$ will increase by

What volume of oxygen gas $\left(\mathrm{O}_2\right)$ measured at $0^{\circ} \mathrm{C}$ and 1 atm, is needed to burn completely $1 \mathrm{~L}$ of propane gas $\left(\mathrm{C}_3 \mathrm{H}_8\right)$ measured under the same conditions?

The value of equilibrium constant of the reaction $$ \mathrm{HI}(\mathrm{g}) \rightleftharpoons \frac{1}{2} \mathrm{H}_2(\mathrm{~g})+\frac{1}{2} \mathrm{I}_2 \text { is } 8.0 $$ The equilibrium constant of the reaction $\mathrm{H}_2(\mathrm{~g})+\mathrm{I}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{HI}(\mathrm{g})$ will be

Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest $\mathrm{pH}$ ?