Physical Chemistry PYQ — Page 9

For the redox reaction: ${\mathrm{MnO}}_{4}^{-}+{C}_{2}{O}_{4}^{2-}+{H}^{+}\rightarrow {\mathrm{Mn}}^{2+}+{\mathrm{CO}}_{2}+{H}_{2}O$ What are the correct coefficients of the reactants for the balanced equation?

What is the correct difference between first and second order reactions?

A mixture of $2.3g$ formic acid and $4.5g$ oxalic acid is treated with concentrate ${H}_{2}{\mathrm{SO}}_{4}$. The evolved gaseous mixture is passed through $\mathrm{KOH}$ pellets. What will be the weight in grams of the remaining product at $\mathrm{STP}$?

The equilibrium constants of the following are: $\begin{matrix}{N}_{2}+3{H}_{2}\rightleftharpoons 2 {\mathrm{NH}}_{3} & {K}_{1} \\ {N}_{2}+{O}_{2}\rightleftharpoons 2 \mathrm{NO} & {K}_{2} \\ {H}_{2}+\frac{1}{2}{O}_{2}\rightarrow {H}_{2}O & {K}_{3}\end{matrix}$ The equilibrium constant ($K$) of the reaction: $2N⁡H{⁡}_{3}+\frac{5}{2}O{⁡}_{2}\overset{K⁡}{\rightleftharpoons }2N⁡O⁡+3H{⁡}_{2}O⁡$, will be:

Which one of the following statements is not correct?

A gas is allowed to expand in a well-insulated container against a constant external pressure of$2.5\mathrm{atm}$ from an initial volume of $2.50L$ to a final volume of $4.50L.$ The change in internal energy $\Delta U$ of the gas in joules will be

Concentration of the ${\mathrm{Ag}}^{+}$ ions in a saturated solution of ${\mathrm{Ag}}_{2}{C}_{2}{O}_{4}$ is $2.2\times {10}^{-4} \mathrm{mol} {L}^{-1}.$ Solubility product of ${\mathrm{Ag}}_{2}{C}_{2}{O}_{4}$ is

Which one of the following statements is wrong?

Which of the following is dependent on temperature?

A first-order reaction has a specific reaction rate ${10}^{-2}{\mathrm{sec}}^{-1}⁡.$ How much time will it take for $20g$ the reactant to reduce to $5g$?

Mechanism of a hypothetical reaction ${X}_{2}+{Y}_{2}\rightarrow 2\mathrm{XY}$ is given below: (i) ${X}_{2}\rightarrow X+X (\mathrm{fast})$ (ii) $X+{Y}_{2}\rightleftharpoons \mathrm{XY}+Y(\mathrm{slow})$ (iii) $X+Y\rightarrow \mathrm{XY} (\mathrm{fast})$ The overall order of the reaction will be

In the electrochemical cell: $\mathrm{Zn}|{\mathrm{ZnSO}}_{4}(0.01M)||{\mathrm{CuSO}}_{4}(1.0 M)|\mathrm{Cu},$ the emf of this Daniel cell is ${E}_{1}$ . When the concentration ${\mathrm{ZnSO}}_{4}$ is changed to $1.0M$ and that of ${\mathrm{CuSO}}_{4}$ changed to $0.01M,$ the emf changes to ${E}_{2}$ . From the following, which one is the relationship between ${E}_{1}$ and ${E}_{2}$? (Given, $\frac{\mathrm{RT}}{F}=0.059$)

If molality of the dilute solution is doubled, the value of molal depression constant $({K}_{f})$ will be

For a given reaction, $\text{Δ}\text{H}=35.5 \text{k}\text{J} \text{m}\text{o}{\text{l}}^{-1}$ and $\text{Δ}\text{S}=83.6 \text{J}{\text{K}}^{-1}\text{m}\text{o}{\text{l}}^{-1}.$ The reaction is spontaneous at : (Assume that $\text{Δ}\text{H}$ and $\text{Δ}\text{S}$ do not vary with temperature)

The addition of a catalyst during a chemical reaction alters which of the following quantities?

The decomposition of phosphine $(P{H}_{3})$ on tungsten at low pressure is a first-order reaction. It is because the

Which one of the following is incorrect for ideal solution?

The solubility of $AgCl(s)$ with solubility product $1.6\times {10}^{-10}$ in $0.1 M NaCl$ solution would be

For a sample of perfect gas, when its pressure is changed isothermally from ${p}_{i}$ to ${p}_{f}$, the entropy change is given by

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

Two electrons occupying the same orbital are distinguished by:

The percentage of pyridine $({C}_{5}{H}_{5}N)$ that forms pyridinium ion $({C}_{5}{H}_{5}{N}^{+}H)$ in a $0.10M$ aqueous pyridine solution $({K}_{b} \mathrm{for} {C}_{5}{H}_{5}N=1.7\times {10}^{-9})$ is

The correct thermodynamic conditions for the spontaneous reaction at all temperatures is:

The pressure of ${H}_{2}$ required to make the potential of hydrogen electrode zero in pure water at 298 K is: