List of top Chemistry Questions on Physical Chemistry asked in TS EAMCET

Which of the following sets are correctly matched?

Sl. No.MoleculesNumber of lone pairs of electrons on central atom
I\(\mathrm{SO_2,\ PbCl_2,\ SF_4}\)\(1\)
II\(\mathrm{XeF_4,\ H_2O,\ BrF_3}\)\(2\)
III\(\mathrm{CCl_4,\ XeF_6,\ IF_7}\)\(0\)


The correct answer is

At \(300\,\mathrm{K}\), the enthalpies of formation of \(\mathrm{C_6H_5COOH(s)}\), \(\mathrm{CO_2(g)}\), and \(\mathrm{H_2O(l)}\) are \(-409\), \(-393\), and \(-286\,\mathrm{kJ\,mol^{-1}}\), respectively. 
The enthalpy of combustion of benzoic acid (in \(\mathrm{kJ\,mol^{-1}}\)) is

How many grams of metallic mercury could be produced approximately by electrolysing a \(1.0\,\mathrm{M}\) \(\mathrm{Hg(NO_3)_2}\) solution with a current of \(2.0\,\mathrm{A}\) for \(3.0\,\mathrm{h}\)? 
\[ \begin{aligned} &\text{Given:} \\ &\text{Molar mass of Hg} = 200\,\mathrm{g\,mol^{-1}},\\ &F = 96500\,\mathrm{C\,mol^{-1}} \end{aligned} \]

For a first order reaction, rate constants at \(50^\circ\mathrm{C}\) and \(100^\circ\mathrm{C}\) are \(1.5\times10^{-5}\,\mathrm{s^{-1}}\) and \(4.5\times10^{-5}\,\mathrm{s^{-1}}\), respectively. What is the approximate activation energy of the reaction (in \(\mathrm{kJ\,mol^{-1}}\))? \[ (\log3=0.48,\;R=8.3\ \mathrm{J\,mol^{-1}K^{-1}}) \]
Which of the following is not the characteristic of chemisorption?
Which of the following is not an example of covalent solid?
The following graph is obtained by taking partial pressure of HCl(g) on \(y\)-axis and mole fraction of HCl(g) in cyclohexane on \(x\)-axis. The slope (\(m\)) of the graph is
Consider the two redox reactions I and II \[ \text{I. }2\mathrm{Na_2S_2O_3}+ \mathrm{I_2} \rightarrow \mathrm{Na_2S_4O_6}+2\mathrm{NaI} \] \[ \text{II. }2\mathrm{KMnO_4}+10\mathrm{FeSO_4}+3\mathrm{H_2SO_4} \rightarrow 2\mathrm{MnSO_4}+5\mathrm{Fe_2(SO_4)_3}+2\mathrm{K_2SO_4}+3\mathrm{H_2O} \] The ratio of equivalent weights of \(\mathrm{KMnO_4}\) and \(\mathrm{Na_2S_2O_3}\) is \[ (\mathrm{K}=39u;\ \mathrm{Mn}=55u;\ \mathrm{O}=16u;\ \mathrm{Na}=23u;\ \mathrm{S}=32u) \]
If the kinetic energy of the molecules in \(8.0\,\text{g}\) methane at \(47^\circ\text{C}\) is \(x\,\text{kJ}\), then the kinetic energy (in kJ) of the molecules in the same amount of dihydrogen at \(127^\circ\text{C}\) is
The mass of sodium hydroxide that must be dissolved in \(1.0\,\text{L}\) solution to get pH of \(12\) is
At \(T(\mathrm{K})\), decomposition of \(A(g)\) follows first order kinetics.

\[ A(g) \rightarrow B(g) + C(g) \]
The following data is obtained for this reaction.

\[ \begin{array}{|c|c|} \hline \text{Time (s)} & \text{Total pressure (atm)} \\ \hline 0 & 0.5 \\ \hline 100 & 0.6 \\ \hline \end{array} \]
What is the rate constant (in \(\mathrm{s^{-1}}\)) for this reaction?

\[ \left(\log 1.25 = 0.097,\; \log 1.666 = 0.222\right) \]
What is the approximate \(E_{\text{cell}}\) (in V) for the following cell at \(298\ \mathrm{K}\)? \[ \mathrm{Sn(s)\,|\,Sn^{2+}(0.05\,M)\,||\,H^+(0.02\,M)\,|\,H_2(1\,bar)\,|\,Pt(s)} \] Given: \[ E^\circ_{\mathrm{Sn^{2+}/Sn}}=-0.14\ \mathrm{V},\qquad E^\circ_{\mathrm{H^+/H_2}}=0.00\ \mathrm{V} \] \[ \log(125)=2.097 \]
In a system, \(x\,\mathrm{J}\) of heat is absorbed and \(y\,\mathrm{J}\) of work is done by the system. What is \(\Delta U\) (in kJ)?
Which of the following mixture form an ideal solution?
The correct statements about the properties of colloidal solutions are
A. Tyndall effect is used to distinguish between a colloidal solution and a true solution
B. Zeta potential is related to movement of colloidal particles
C. Brownian motion in colloidal solution is faster if the viscosity of the solution is very high
D. Brownian motion stabilises the sols
R\(\rightarrow\)P is a first order reaction. For this reaction a graph of ln[R] (on y-axis) and time (on x-axis) gave a straight line with negative slope. The intercept on y-axis is equal to (k=rate constant)
A current of 0.5 ampere is passed through molten AlCl\(_3\) for 96.5 seconds. The mass of aluminium deposited at cathode is x mg and volume of chlorine liberated (at STP) at anode is y mL. x and y are respectively
In a mixture of liquids A and B, if the mole fractions of component A in vapour phase and liquid mixture are \(x_1\) and \(x_2\) respectively, then the total vapour pressure of liquid mixture is (where P\(_A^0\) and P\(_B^0\) are the vapour pressures of pure A and B)
The volume of water required to dissolve 0.1 g PbCl\(_2\) to get a saturated solution (in mL) is (Given K\(_{sp}\)(PbCl\(_2\)) = \(3.2 \times 10^{-8}\); Atomic mass of Pb = 207u)
The force (F) required to maintain the flow of layers of a liquid is equal to (A = area of contact of layers, dz = distance between the layers, du = change in velocity, \(\eta\) = coefficient of viscosity)
Sodium metal crystallises in a body centred cubic lattice with edge length of x Å. If the radius of sodium atom is 1.86 Å, the value of x is
The most effective coagulating agent for antimony sulphide sol is
Consider a general first order reaction \(\text{A(g)} \rightarrow \text{B(g)} + \text{C(g)}\). If the initial pressure is 200 mm and after 20 minutes it is 250 mm, then the half-life period of the reaction (in minutes) is
(\(\log 2 = 0.30, \log 3 = 0.48, \log 4 = 0.60\))
Electrolysis of aqueous copper (II) sulphate between Pt electrodes gives 'X' at anode and 'Y' at cathode. X and Y are respectively

The osmotic pressure (in atm) of an aqueous solution containing 0.01 mol of NaCl (degree of dissociation 0.94) and 0.03 mol of glucose in 500 mL at \(27^\circ\text{C}\) is \((R = 0.082\text{L atm K}^{-1}\text{mol}^{-1})\)