Physical Chemistry PYQ — Page 12

Which of the following salts will give highest $pH$ in water?

$B{e}^{2+}$ is isoelectronic with which of the following ions?

Calculate the energy in corresponding to light of wavelength $45 nm:$ (Planck’s constant $h=6.63\times {10}^{-34}Js:speed of light c=3\times {10}^{8} m{s}^{-1})$

Magnetic moment $2.83$ BM is given by which of the following ions? (At.nos. $Ti=22,Cr=24, Mn=25, Ni=28)$

The weight of silver (at.wt. $=108$) displaced by a quantity of electricity which displaces $5600 mL$ of ${O}_{2}$ at $\mathrm{STP}$ will be

Using the Gibbs change, $\Delta {G}^{o}=+63.3 kJ,$ for the following reaction, $A{g}_{2}C{O}_{3}(g) \rightleftharpoons 2A{g}^{+}(aq)+C{O}_{3}^{2-}(aq)$ the ${K}_{sp}$ of $A{g}_{2}C{O}_{3}(s)$ in water at ${25}^{o}C$ is $(R=8.314 J{K}^{-1}mo{l}^{-1})$

For the reversible reaction: ${N}_{2}(g)+3{H}_{2}(g)\rightleftharpoons 2N{H}_{3}(g)+heat$ The equilibrium shifts in forward direction:

What is the maximum number of orbitals that can be identified with the following quantum number $n=3, l=1, m=0$?

For a reaction between $A$ and $B$ the order with respect to $A$ is 2 and the other with respect to $B$ is 3 . The concentrations of both $\mathrm{A}$ and $\mathrm{B}$ are doubled, the rate will increase by a factor of:

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers? $n=3, l=1$ and $m=-1$

A magnetic moment of $1.73 \mathrm{BM}$ will be shown by one among the following

An excess of $\mathrm{AgNO}_3$ is added to $100 \mathrm{~mL}$ of a $0.01 \mathrm{M}$ solution of dichlorotetraaquachromium (III) chloride. The number of moles of AgCl precipitate would be

A reaction is $50 \%$ complete in 2 hours and $75 \%$ complete in 4 hours. The order of reaction is:

Three thermochemical equation are given below: (i) $\underset{\mathrm{kJJ} \mathrm{mol}^{-1}}{\mathrm{C}_{\text {(graphite) }}}+\mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{CO}_{2(g)} \Delta \mathrm{H}^{\circ}=x$ (iii) $\mathrm{CO}_{(\mathrm{gJ})}+1 / 2 \mathrm{O}_{2(\mathrm{gk}} \rightarrow \mathrm{CO}_{2(\mathrm{~g}) i} \Delta \mathrm{H}^{\circ}=\mathrm{z}$ Based on the above equations, find out which of the relationship given below is correct.

In an experiment it is shown that $10 \mathrm{ml}$ of $0.05 \mathrm{M}$ solution of chloride required 10 $\mathrm{ml}$ of $0.1 \mathrm{M}$ solution of $\mathrm{AgNO}_3$, which of the following will be the formula of the chloride ( $\mathrm{X}$ stands for the symbol of the element other than chlorine)

How many grams of concentrated nitric acid solution should be used to prepare $250 \mathrm{~mL}$ of $2.0 \mathrm{M} \mathrm{HNO}_3$ ? The concentrated acid is $70 \% \mathrm{HNO}_3$.

Based on equation $E=-2.178 \times 10^{-18} \mathrm{~J}\left(\frac{Z^2}{n^2}\right)$ certain conclusions are written. Which of them is not correct?

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of $\mathrm{pH}=10$ and by passing hydrogen gas around the platinum wire at $1 \mathrm{~atm}$ pressure. The oxidation potential of electrode would be

Which condition is not satisfied by an ideal solution?

Consider the half-cell reduction reaction: $$ \begin{aligned} & \mathrm{Mn}^{2+}+2 e^{-} \rightarrow \mathrm{Mn}, \mathrm{E}^{\mathrm{o}}=-1.18 \mathrm{~V} \\ & \mathrm{Mn}^{2+} \rightarrow \mathrm{Mn}^{3+}+e^{-}, \mathrm{E}^{\mathrm{o}}=1.51 \mathrm{~V} \end{aligned} $$ The $\mathrm{E}^{\circ}$ for the reaction $3 \mathrm{Mn}^{2+} \rightarrow \mathrm{Mn}^0$ $+2 \mathrm{Mn}^{3+}$, and possibility of the forward reaction are respectively

What is the activation energy for a reaction if its rate doubles when the temperature is raised from $20^{\circ} \mathrm{C}$ to $35^{\circ} \mathrm{C} ?\left(R=8.314 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\right)$

A reaction having equal energies of activation for forward and reverse reactions has

$6.02 \times 10^{20}$ molecules of urea are present in $100 \mathrm{~mL}$ of its solution. The concentration of solution is

Which is the strongest acid in the following?