NEET UG 2016 — Physical Chemistry

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:

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

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:

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

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

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 ${K}_{eq}$?

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 $N{Y}_{3}$ ?

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

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

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

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

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 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 $=1.60\times {10}^{-19} C$)

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

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:

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

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

Two electrons occupying the same orbital are distinguished by:

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

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)

Which one of the following is incorrect for ideal solution?

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