Physical Chemistry PYQ — Page 11

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

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

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

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:

The rate constant of the reaction $A\longrightarrow B$ is $0.6\times {10}^{-3}$ mole per liter per second. If the initial concentration of A is 5 M, then the concentration of B after 20 minutes is:

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?

The heat of combustion of carbon to $C{O}_{2}$ is$-393.5\mathrm{kJ}/\mathrm{mol}$. The heat released upon the formation of $35.2g$ of $C{O}_{2}$ from carbon and oxygen gas is

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

The boiling point of $0.2 mol k{g}^{-1}$ solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?

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 of the following pairs of iron are isoelectronic and isostructural?

What is the mass of the precipitate formed when 50 mL of $16.9%$ solution of $AgN{O}_{3}$ is mixed with 50 mL of $5.8%$ NaCl solution? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5)

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?

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

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:

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:

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

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

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

The pair of compounds that can exist together is: