Physical Chemistry PYQ — Page 2

The ratio of solubility of AgCl in 0.1 M KCl solution to the solubility of AgCl in water is: (Given : Solubility product of $\mathrm{AgCl}=10^{-10}$ )

Choose the correct statement for the work done in the expansion and heat absorbed or released when 5 litres of an ideal gas at 10 atmospheric pressure isothermally expands into vacuum until volume is 15 litres:

The quantum numbers of four electrons are given below : I. $n=4 ; I=2 ; m_1=-2 ; s=-\frac{1}{2}$ II. $n=3 ; I=2 ; m_1=1 ; s=+\frac{1}{2}$ III. $n=4 ; I=1 ; m_1=0 ; s=+\frac{1}{2}$ IV. $n=3 ; I=1 ; m_1=-1 ; s=+\frac{1}{2}$ The correct decreasing order of energy of these electrons is

Following data is for a reaction between reactants A and B :  The order of the reaction with respect to $A$ and $B$, respectively, are

Match List I with List II.  Choose the correct answer from the options given below:

For the following reaction at 300 K $\mathrm{A}_2(\mathrm{~g})+3 \mathrm{~B}_2(\mathrm{~g}) \rightarrow 2 \mathrm{AB}_3(\mathrm{~g})$ the enthalpy change is +15 kJ then the internal energy change is:

The standard cell potential of the following cell $\mathrm{Zn}\left|\mathrm{Zn}^{2+}(\mathrm{aq})\right| \mathrm{Fe}^{2+}(\mathrm{aq}) \mid \mathrm{Fe}$ is 0.32 V . Calculate the standard Gibbs energy change for the reaction : $\mathrm{Zn}(\mathrm{s})+\mathrm{Fe}^{2+}(\mathrm{aq}) \rightarrow \mathrm{Zn}^{2+}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s})$ (Given : $1 \mathrm{~F}=96487 \mathrm{C}$ )

Match List-I with List-II:  Choose the correct answer from the options given below:

The pH of a solution is defined as:

For the reaction $2 \mathrm{~A} \rightleftharpoons \mathrm{B}+\mathrm{C}, \mathrm{K}_{\mathrm{C}}=4 \times 10^{-3}$. At a given time, the composition of reaction mixture is: $[\mathrm{A}]=[\mathrm{B}]=[\mathrm{C}]=2 \times 10^{-3} \mathrm{M}$. Then, which of the following is correct?

A compound $X$ contains $32 \%$ of $A, 20 \%$ of $B$ and remaining percentage of $C$. Then, the empirical formula of X is : (Given atomic masses of $A=64 ; B=40 ; C=32 u$)

The rate of a reaction quadruples when temperature changes from $27^{\circ} \mathrm{C}$ to $57^{\circ} \mathrm{C}$. Calculate the energy o activation. Given $\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}, \log 4=0.6021$

For an endothermic reaction: (A) $\mathrm{qp}_{\mathrm{p}}$ is negative. (B) $\Delta_r H$ is positive. (C) $\Delta_r \mathrm{H}$ is negative. (D) $\mathrm{q}_{\mathrm{p}}$ is positive. Choose the correct answer from the options given below:

Rate constants of a reaction at 500 K and $700 \mid \mathrm{K}$ are $0.04 \mathrm{~s}^{-1}$ and $0.14 \mathrm{~s}^{-1}$, respectively; then, activation energy of the reaction is : (Given: $\log 3.5=0.5441, \mathrm{R}=8.31 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$

Which indicator is used in the titration of sodium hydroxide against oxalic acid and what is the colour change at the end point?

The highest number of helium atoms is in

Which of the following plot represents the variation of $\ln \mathrm{k}$ versus $\frac{1}{T}$ in accordance with Arrhenius equation?

The work done during reversible isothermal expansion of one mole of hydrogen gas at $25^{\circ} \mathrm{C}$ from pressure of 20 atmosphere to 10 atmosphere is (Given $\mathrm{R}=2.0 \mathrm{cal} \mathrm{K}^{-1} \mathrm{~mol}^{-1}$ )

Which reaction is NOT a redox reaction?

Match List I with List II.  Choose the correct answer from the options given below:

1.0 g of $\mathrm{H}_2$ has same number of molecules as in:

Activation energy of any chemical reaction can be calculated if one knows the value of

Consider the following reaction in a sealed vessel at equilibrium with concentrations of $\mathrm{N}_2=3.0 \times 10^{-3} \mathrm{M}, \mathrm{O}_2=4.2 \times 10^{-3} \mathrm{M}$ and $\mathrm{NO}=2.8 \times 10^{-3} \mathrm{M}$. $2 \mathrm{NO}_{(\mathrm{g})} \rightleftharpoons \mathrm{N}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}$ If 0.1 mol $\mathrm{L}^{-1}$ of $\mathrm{NO}_{(\mathrm{g})}$ is taken in a closed vessel, what will be degree of dissociation ( $\alpha$ ) of $\mathrm{NO}_{(\mathrm{g})}$ at equilibrium?

Which of the following pairs of ions will have same spin only magnetic moment values within the pair? A. $\mathrm{Zn}^{2+}, \mathrm{Ti}^{2+}$ B. $\mathrm{Cr}^{2+}, \mathrm{Fe}^{2+}$ C. $\mathrm{Ti}^{3+}, \mathrm{Cu}^{2+}$ D. $\mathrm{V}^{2+}, \mathrm{Cu}^{+}$ Choose the correct answer from the options given below