Problem 2
Two atoms \(X\) and \(Y\) are non-polar and electrically symmetrical. What type of intermolecular forces of attraction can be developed between them? (a) Dipole-induced dipole forces (b) London forces or dispersion forces (c) Dipole-dipole forces (d) No forces of any kind.
Problem 3
The types of attractive forces between a polar molecule and a non-polar molecule are (a) dipole-dipole forces (b) hydrogen bonds (c) dipole-induced dipole forces (d) dispersion forces.
Problem 4
Boilingpoint of hydrogen fluoride is highest amongst HF, HCl, HBr and HI. Which type of intermolecular forces are present in hydrogen fluoride? (a) \(\mathrm{H}-\mathrm{F}\) has highest van der Waals' forces and dipole moment. (b) \(\mathrm{H}-\mathrm{F}\) has highest London forces. (c) H-F has highest dipole moment hence has dipole-dipole, London forces and hydrogen bonding. (d) H-F has strong intermolecular interactions like dipole-induced dipole.
Problem 5
What is the effect on chemical properties and physical properties of water when temperature is changed? (a) Chemical properties of water remain same but the physical state changes with change in temperature. (b) Chemical properties of water change with change in temperature but physical properties remain same. (c) Thereisnoeffectonchemicalorphysicalproperties of water when temperature is changed. (d) Both chemical and physical properties of water change with change in temperature.
Problem 6
What is the relationship between thermal energy and intermolecular interaction energy of a substance in three states in terms of \(X\) and \(Y ?\) Gas \(\longrightarrow\) Liquid \(\longrightarrow\) Solid (a) \(X\)-Thermal energy, \(Y\)-Intermolecular interactions (b) \(X\)-Thermal energy, \(Y\)-Thermal energy (c) \(X\)-Intermolecular interactions, \(Y\)-Thermal energy (d) \(X\)-Intermolecular interactions, \(Y\)-Intermolecular interactions
Problem 9
Representing \(P, V\) and \(T\) as pressure, volume and temperature, which of the following is the correct representation of Boyle's law? (a) \(V \propto \frac{1}{T}\) (P constant) (b) \(V \propto \frac{1}{P}\) ( \(T\) constant) (c) \(P V=R T\) (d) \(P V=n R T\)
Problem 13
A graph is plotted between pressure and volume at different temperatures. On the basis of the graph what changes will you observe in the volume if (i) the pressure is increased at constant temperature. (ii) the temperature is decreased at constant pressure. (a) volume increases in both the cases (b) volume decreases in both the cases (c) volume increases in (i) and decreases in (ii) (d) volume decreases in (i) and increases in (ii).
Problem 14
What is the effect on the pressure of a gas if its temperature is increased at constant volume? (a) The pressure of the gas increases. (b) The pressure of the gas decreases. (c) The pressure of the gas remains same. (d) The pressure of the gas becomes double.
Problem 20
Absolute zero can be defined as the temperature at which (a) pressure becomes zero (b) volume becomes zero (c) mass becomes zero (d) density becomes zero.
Problem 25
The relations between various variables of gaseous substances are given along with their formulae. Mark the incorrect relationship. (a) Density and molar mass : \(M=\frac{d R T}{P}\) (b) Universal gas constant, \(P, V, T: R=\frac{P V}{n T}\) (c) Volume and pressure: \(V_{2}=\frac{P_{2} V_{1}}{P_{1}}\) (d) Volume and temperature: \(V_{2}=\frac{V_{1} T_{2}}{T_{1}}\)
