Physical Chemistry PYQ — Page 24

Position of non-polar and polar parts in micelle is:

A solution contains non-volatile solute of molecular mass $M_2$. Which of the following can be used to calculate the molecular mass of the solute in terms of the osmotic pressure? Note: $m_2$ is the mass of the solute, $\mathrm{V}$ is the volume of the solution and $\pi$ is the osmotic pressure.

Heat of combustion $\Delta \mathrm{H}^{\circ}$ for $\mathrm{C}(s), \mathrm{H}_2(g)$ and $\mathrm{CH}_4(g)$ are $-94,-68$ and $-213 \mathrm{kcal}$ $\mathrm{mol}^{-1}$, then, $\Delta \mathrm{H}^{\circ}$ for $\mathrm{C}(s)+2 \mathrm{H}_2(g) \rightarrow$ $\mathrm{CH}_4(g)$ is:

$2 \mathrm{~moles}$ of the ideal gas at $27^{\circ} \mathrm{C}$ temperature is expanded reversibly from $2 \mathrm{~L}$ to $20 \mathrm{~L}$. Find the entropy change $\left(\mathrm{R}=2 \mathrm{cal} \mathrm{mol}^{-1}\right.$ $\left.\mathrm{K}^{-1}\right)$ :

$3 \mathrm{~A} \rightarrow 2 \mathrm{~B}$, then the rate of reaction $\frac{+d[\mathrm{~B}]}{d t}$ is equal to:

Which of the following is isoelectronic?

If the solubility of $\mathrm{MX}_2$ type electrolyte is $0.5 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1}$, then, find out $\mathrm{K}_{s p}$ of the electrolyte.

In a hydrogen atom, the energy of the first excited state is $-3.4 \mathrm{eV}$. Then, find out the K.E. of the same orbit of the hydrogen atom.

Which has highest $\mathrm{pH}$ ?

Which has the maximum molecules?

The reaction $2 \mathrm{~A} \rightarrow \mathrm{B}+\mathrm{C}$, would be a zero-order reaction when:

$5 \mathrm{~L}$ of $1 \mathrm{M} \mathrm{NaOH}$ solution is mixed with $3 \mathrm{~L}$ of $0.5 \mathrm{M} \mathrm{NaOH}$ solution. Find out the molarity of the resultant solution:

For the reaction $\mathrm{BaO}_2(s) \rightleftharpoons \mathrm{BaO}(s)+\mathrm{O}_2(g) ; \Delta \mathrm{H}=+\mathrm{ve} \text {. }$ In an equilibrium condition, pressure of $\mathrm{O}_2$ depends on:

In a closed insulated container a liquid is stirred with a paddle to increase the temperature, which of the following is true?

A solution containing components $\mathrm{A}$ and B follows Raoult's law if:

Which reaction is not feasible?

Under which conditions van der Waals real gas acts as an ideal gas?

Unit of entropy is:

In electrolysis of $\mathrm{NaCl}$ when $\mathrm{P} t$ electrode is taken then $\mathrm{H}_2$ is liberated at cathode while with $\mathrm{Hg}$ cathode it forms sodium amalgam because: