Physical Chemistry PYQ — Page 11

What is mole fraction of the solute in a 1.00 m aqueous solution?

A mixture of gases contains ${H}_{2}$ and ${O}_{2}$ gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture?

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. No. Z = 22)

The ${K}_{\mathrm{sp}}$ of ${\mathrm{Ag}}_{2}{\mathrm{CrO}}_{4}, \mathrm{AgCl}, \mathrm{AgBr}$ and $AgI$ are respectively, $1.1\times {10}^{-12} , 1.8\times {10}^{-10} , 5.0\times {10}^{-13} , 8.3\times {10}^{-17}$ . Which one of the following salts will precipitate last if $AgN{O}_{3}$ solution is added to the solution containing equal moles of NaCl, NaI, NaBr and $N{a}_{2}Cr{O}_{4}$ ?

Which one is not equal to zero for an ideal solution?

Which of the following statements is correct for a reversible process in the state of equilibrium?

A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as:

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is:

The number of water molecules is maximum in

If the equilibrium constant for ${N}_{2}(g)+{O}_{2}(g)\rightleftharpoons 2NO(g)$ is K, the equilibrium constant for $\frac{1}{2}{N}_{2}(g)+\frac{1}{2}{O}_{2}(g)\rightleftharpoons NO(g)$ will be:

20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (Atomic weight: Mg = 24)

The activation energy of a reaction can be determined from the slope of which of the following graphs?

If Avogadro number ${N}_{A}$ , is changed from $6.022\times {10}^{23} mo{l}^{-1}$ to $6.022\times {10}^{20} mo{l}^{-1}$ , this would change:

The angular momentum of electron in $d$-orbital is equal to

Which of the following pairs of iron are isoelectronic and isostructural?

Which one of the following pairs of solution is not an acidic buffer?

Aqueous solution of which of the following compounds is the best conductor of electric current?

For a given exothermic reaction ${K}_{p}$ and ${K'}_{p}$ are the equilibrium constants at temperatures ${T}_{1}$ and ${T}_{2}$ respectively (T$_{2}$.>T$_{1}$ ). Assuming that heat of reaction is constant in temperatures range between ${T}_{1}$ and ${T}_{2},$ it is readily observed that:

Of the following $0.10m$ aqueous solutions, which one will exhibit the largest freezing point depression?

$1.0 g$ of magnesium is burnt with $0.56 g$ ${O}_{2}$ in a closed vessel. Which reaction is left in excess and how much? (At, wt. $Mg=24;O=16)$

When $22.4$ litres of ${H}_{2}(g)$ is mixed with $11.2$ litres of $C{l}_{2}(g),$ each at STP, the moles of $HCl(g)$ formed is equal to

When $0.1 mol {MnO}_{4}^{2-}$ is oxidized the quantity of electricity required to completely $Mn{O}_{4}^{2-}$ to $Mn{O}_{4}^{-}$ is

For the reaction: ${X}_{2}{O}_{4}(l)\rightarrow 2X{O}_{2}(g)$ $\Delta U=2.1 k \mathrm{cal}, \Delta S=20 \mathrm{cal} {K}^{-1}$ at $300 K$ Hence, $\Delta G$ is:

The pair of compounds that can exist together is: