Chemistry Physical Chemistry questions from NEET UG 2010.
A $0.66 \mathrm{~kg}$ ball is moving with a speed of $100 \mathrm{~m} / \mathrm{s}$. The associated wavelength will be (h $\left.=6.6 \times 10^{-34} \mathrm{Js}\right)$
An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase ?
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
Consider the following relations for emf of a electrochemical cell (A) Emf of cell = (oxidation potential of anode) - (reduction potential of cathode) (B) Emf of cell = (oxidation potential of anode) + (reduction potential of cathode) (C) Emf of cell = (reduction potential of anode) + (reduction potential of cathode) (D) Emf of cell = (oxidation potential of anode)-(Oxidation potential of cathode) Which of the above relations are correct?
$A B$ crystallizes in a body centred cubic lattice with edge length ' $a$ ' equal to $387 \mathrm{pm}$. The distance between two oppositively charged ions in the lattice is
During the kinetic study of the reaction, $2 \mathrm{~A}+\mathrm{B} \rightarrow \mathrm{C}+\mathrm{D}$, following results were obtained \(\begin{array}{|c|c|c|c|} \hline \text { Run } & [A] / \mathrm{mol~} \mathrm{L}^{-1} & [B] / \mathrm{mol~} \mathrm{L}^{-1} & \begin{array}{cc} \text{Initial rate of} \\ \text{formation of} \\ D / \mathrm{mol~} \mathrm{L}^{-1} \mathrm{~min}^{-1} \end{array} \\ \hline \text { I } & 0.1 & 0.1 & 6.0 \times 10^{-3} \\ \hline \text { II } & 0.3 & 0.2 & 7.2 \times 10^{-2} \\ \hline \text { III } & 0.3 & 0.4 & 2.88 \times 10^{-1} \\ \hline \text { IV } & 0.4 & 0.1 & 2.40 \times 10^{-2} \\ \hline \end{array}\) Based on the above data which one of the following is correct?
For an endothermic reaction, energy of activation is $E_a$ and enthalpy of reaction is $\Delta H$ (both of these in $\mathrm{kJ} / \mathrm{mol}$ ). Minimum value of $E_a$ will be
For the reaction \(\mathrm{N}_2 \mathrm{O}_5(\mathrm{g}) \rightarrow 2 \mathrm{NO}_2(\mathrm{g})+(1 / 2) \mathrm{O}_2(\mathrm{g})\) the value of rate of disappearance of \(\mathrm{N}_2 \mathrm{O}_5\) is given as \(6.25 \times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\). The rate of formation of \(\mathrm{NO}_2\) and \(\mathrm{O}_2\) is given respectively as
For the reduction of silver ions with copper metal, the standard cell potential was found to be $+0.46 \mathrm{~V}$ at $25^{\circ} \mathrm{C}$. The value of standard Gibbs energy, $\Delta \mathrm{G}^{\circ}$ will be $\left(\mathrm{F}=96500 \mathrm{C} \mathrm{mol}^{-1}\right)$
For vaporisation of water at $1 \mathrm{~atm}$ pressure, the values of $\Delta \mathrm{H}$ and $\Delta S$ are $40.63 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $108.8 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$, respectively. The temperature when Gibbs energy change $(\Delta G)$ for this transformation will be zero, is
If $\mathrm{pH}$ of a saturated solution of $\mathrm{Ba}(\mathrm{OH})_2$ is 12 , the value of its $K_{s p}$ is
In a buffer solution containing equal concentration of $\mathrm{B}^{-}$and $\mathrm{HB}$, the $\mathrm{K}_{\mathrm{b}}$ for $\mathrm{B}^{-}$is $10^{-10}$. The $\mathrm{pH}$ of buffer solution is
In producing chlorine by electrolysis $100 \mathrm{~kW}$ power at $125 \mathrm{~V}$ is being consumed. How much chlorine per minute is liberated (ECE of chlorine is $0.367 \times 10^{-6} \mathrm{kgC}^{-1}$ )
In which of the following equilibrium $\mathrm{K}_C$ and $\mathrm{K}_{\mathrm{P}}$ are not equal ?
Match List I (equations) with List II (types of process) and select the correct OPTION.  
$25.3 \mathrm{~g}$ of sodium carbonate, $\mathrm{Na}_2 \mathrm{CO}_3$ is dissolved in enough water to make $250 \mathrm{~mL}$ of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, $\mathrm{Na}^{+}$and carbonate ion, $\mathrm{CO}_3^{2-}$ are respectively (Molar mass of $\mathrm{Na}_2 \mathrm{CO}_3=106 \mathrm{~g} \mathrm{~mol}^{-1}$ )
Standard entropies of $\mathrm{X}_2, \mathrm{Y}_2$ and $\mathrm{XY}_3$ are 60,40 and $50 \mathrm{~J} \mathrm{~K} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$ respectively. For the reaction $\frac{1}{2} \mathrm{X}_2+\frac{3}{2} \mathrm{Y}_2 \rightleftharpoons \mathrm{XY}_3 ; \Delta \mathrm{H}=-30 \mathrm{~kJ}$, to be at equilibrium, the temperature should be
The correct order of the decreasing ionic radii among the following isoelectronic species is
The following two reactions are known $$ \begin{aligned} & \mathrm{Fe}_2 \mathrm{O}_3(\mathrm{~s})+3 \mathrm{CO}(\mathrm{g}) \longrightarrow 2 \mathrm{Fe}(\mathrm{s})+3 \mathrm{CO}_2(\mathrm{~g}), \\ & \Delta \mathrm{H}=-26.8 \mathrm{~kJ} \\ & \mathrm{FeO}(\mathrm{s})+\mathrm{CO}(\mathrm{g}) \longrightarrow \mathrm{Fe}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g}) \\ & \Delta \mathrm{H}=-16.5 \mathrm{~kJ} \end{aligned} $$ The value of $\Delta \mathrm{H}$ for the following reaction $\mathrm{Fe}_2 \mathrm{O}_3(\mathrm{~s})+\mathrm{CO}(\mathrm{g}) \longrightarrow 2 \mathrm{FeO}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g})$ is
The number of atoms in 0.1 mole of a triatomic gas is $\left(\mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23} \mathrm{~mol}^{-1}\right)$
The rate of the reaction, $2 \mathrm{NO}+\mathrm{Cl}_2 \longrightarrow 2 \mathrm{NOCl}$ is given by the rate equation, rate $=\mathrm{k}[\mathrm{NO}]^2\left[\mathrm{Cl}_2\right]$ The value of the rate constant can be increased by
The reaction, \(2 \mathrm{~A}_{(\mathrm{g})}+\mathrm{B}_{(\mathrm{g})} \leftrightharpoons 3 \mathrm{C}_{(\mathrm{g})}+\mathrm{D}_{(\mathrm{g})}\) is begun with the concentrations of \(A\) and \(B\) both at an initial value of 1.00 M When equilibrium is reached, the concentration of \(D\) is measured and found to be 0.25 M. The value for the equilibrium constant for this reaction is given by the expression
Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be
What is $\left[\mathrm{H}^{+}\right]$in $\mathrm{mol} / \mathrm{L}$ of a solution that is $0.20 \mathrm{M}$ in $\mathrm{CH}_3 \mathrm{COONa}$ and $0.10 \mathrm{M}$ in $\mathrm{CH}_3 \mathrm{COOH}$ ? $\left(\mathrm{K}_{\mathrm{a}}\right.$ for $\mathrm{CH}_3 \mathrm{COOH}=1.8 \times 10^{-5}$ )
Which of the following expressions correctly represents the equivalent conductance at infinite dilution of $\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$. Given that $\Lambda_{\mathrm{Al}^{3+}}^{\circ}$ and $\Lambda_{\mathrm{SO}_4^{2-}}^{\circ}$ are the equivalent conductances at infinite dilution of the respective ions?
Which of the following pairs has the same size?
Which of the following species is not electrophilic in nature?
Which one of the following ions has electronic configuration $[\mathrm{Ar}] 3 \mathrm{~d}^6$ ? (At. no: $\mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27, \mathrm{Ni}=28$ )
Which one of the following molecular hydrides acts as a Lewis acid ?