NEET UG 2016 — Physical Chemistry

For a sample of perfect gas, when its pressure is changed isothermally from ${p}_{i}$ to ${p}_{f}$, the entropy change is given by

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

Two electrons occupying the same orbital are distinguished by:

The percentage of pyridine $({C}_{5}{H}_{5}N)$ that forms pyridinium ion $({C}_{5}{H}_{5}{N}^{+}H)$ in a $0.10M$ aqueous pyridine solution $({K}_{b} \mathrm{for} {C}_{5}{H}_{5}N=1.7\times {10}^{-9})$ is

The correct thermodynamic conditions for the spontaneous reaction at all temperatures is:

The pressure of ${H}_{2}$ required to make the potential of hydrogen electrode zero in pure water at 298 K is:

Consider the following liquid - vapour equilibrium. $Liquid\rightleftharpoons Vapour$ Which of the following relations is correct?

Suppose the elements $X$ and $Y$ combine to form two compounds $X{Y}_{2}$ and ${X}_{3}{Y}_{2}$. When $0.1\mathrm{mole}$ of $X{Y}_{2}$ weighs $10g$ and $0.05\mathrm{mole}$ of ${X}_{3}{Y}_{2}$ weighs $9g$, the atomic weights of $X$ and $Y$ are

MY and $N{Y}_{3}$ , two nearly insoluble salts, have the same ${K}_{sp}$ values of $6.2\times {10}^{-13}$ at room temperature. Which statement would be true in regard to MY and $N{Y}_{3}$ ?

Which of the following pairs of $d-$orbitals will have the electron density along the axis?

If the ${E}_{cell}^{o}$ for a given reaction has a negative value, which of the following gives the correct relationship for the values of $\Delta {G}^{o}$ and ${K}_{eq}$?

During the electrolysis of molten sodium chloride, the time required to produce $0.10\mathrm{mol}$ of chlorine gas using a current of $3\mathrm{amperes}$ is

Fog is a colloidal solution of:

How many electrons can fit in each orbital for which $n=3$ and $l=1$?

The rate of a first-order reaction is $0.04 mol {l}^{-1}{s}^{-1}$ at $10$ second and $0.03 mol {l}^{-1}{s}^{-1}$ at $20$ seconds after initiation of the reaction. The half-life period of the reaction is:

Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at ${25}^{o}C$ . (Given vapour pressure data at ${25}^{o}C$ , benzene = 12.8 kPa, toluene = 3.85 kPa)

The number of electrons delivered at the cathode, during electrolysis by a current of $1\mathrm{ampere}\mathrm{in}60\mathrm{seconds}$ is (charge on electron $=1.60\times {10}^{-19} C$)

At ${100}^{o}C$ the vapour pressure of a solution of 6.5 g of a non-volatile solute in 100 g water is 732 mm. If ${K}_{b}=0.52$ , the boiling point of this solution will be:

The van't Hoff factor $(i)$ for a dilute aqueous solution of the strong electrolyte barium hydroxide is

The molar conductivity of a $0.5\mathrm{mol}{\mathrm{dm}}^{-3}$ solution of $AgN{O}_{3}$ with electrolytic conductivity of $5.76\times {10}^{-3}S c{m}^{-1}$ at $298K$

The solubility of $AgCl(s)$ with solubility product $1.6\times {10}^{-10}$ in $0.1 M NaCl$ solution would be

Which one of the following is incorrect for ideal solution?

The decomposition of phosphine $(P{H}_{3})$ on tungsten at low pressure is a first-order reaction. It is because the

The addition of a catalyst during a chemical reaction alters which of the following quantities?