Physical Chemistry Questions

A metal crystallizes with a face-centered cubic (FCC) lattice. The edge of the unit cell is $408\text{pm}$. The diameter of the metal atom is:

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

The enthalpy of fusion of water is $1.435\text{kcal/mol}$. The molar entropy change for the melting of ice at $0^{\circ }\text{C}$ is:

Limiting molar conductivity of ${\text{NH}}_4\text{OH}$ (i.e., ${\Lambda }_m^{\circ }({\text{NH}}_4\text{OH})$) is equal to:

In Freundlich Adsorption isotherm, the value of $1/n$ is:

Buffer solutions have constant acidity and alkalinity because:

pH of a saturated solution of ${\text{Ba(OH)}}_2$ is 12. The value of solubility product ($K_{sp}$) of ${\text{Ba(OH)}}_2$ is:

For a first order reaction A → B, the reaction rate at reactant concentration of 0.01 M is found to be 2.0 x 10^-5 mol L^-1 s^-1. The half life period of the reaction is :

The protecting power of lyophilic colloidal sol is expressed in terms of:

The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin follows the order:

Which one of the following statements is INCORRECT about enzyme catalysis?

Maximum number of electrons in a subshell with $l=3$ and $n=4$ is:

The correct set of four quantum numbers for the valence electron of rubidium atom ($Z=37$) is:

In a reaction, $A+B\to \text{Product}$, rate is doubled when the concentration of $B$ is doubled, and rate increases by a factor of $8$ when the concentrations of both the reactants ($A$ and $B$) are doubled. The rate law for the reaction can be written as:

At 25°C, the dissociation constant of a base, BOH, is 1.0 x 10^-12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be :

The number of octahedral void(s) per atom present in a cubic close-packed structure is: